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Appendix G

Revision 4

CDM-760 Advanced High-Speed Trunking Modem

MN-CDM760

G–2

G.2 Background

The CDM-760 system was originally based on DVB-S2 standards. New network specifications

such as DVB-S2-EB1 have been released by Comtech EF Data since the initial release of the CDM-

760. The DVB-S2 network specification in the CDM-760 offers 24 MODCODs that work over a

guaranteed Es/No range of 1.2dB to 16.5dB. By comparison, Comtech EF Data’s DVB-S2-EB1

Network Specification offers a suite of 40 MODCODs over this same Es/No range – nearly twice

the number of MODCOD selections for enhanced ACM performance

DVB standards also defined much of the system for both ACM and a related feature named

InBand Signaling. The CDM-760 supports duplex ACM operation between a pair of modems in a

point-to-point link (point-to-multipoint ACM operation is not currently supported). In ACM

mode, the symbol rate remains constant, and the modulation and coding (ModCod in DVB-S2

terms) changes to preserve the data integrity. Most links are designed with enough Es/No margin

to provide error free performance under faded conditions when there is higher attenuation in the

uplink or downlink path to/from the satellite.

Depending on the geographical region and link budget criteria, faded conditions can occur less

than 1% of the time. In such as case the operating Es/No of the link is higher than needed for more

than 99% of the year. ACM takes advantage of this link margin by increasing the ModCod during

unfaded conditions allowing the link to operate at a higher data rates during these periods. A

simplified example illustrates the point.

Table G-1

shows the several ModCods, the Spectral

Efficiency (SE), and Es/No for the CDM-760 assuming Normal FEC Frame (64,800 bits).

Table G-1. ACM Example for Standard FECFrame (64,800 bits)

ModCod

Spectral Efficiency

Pilots ON

Guaranteed Es/No

(dB)

Data Rate (Mbps)

at 20 Msps

QPSK 1/2

0.9653

1.4

19.31

QPSK 3/5

1.1600

3.7

23.20

QPSK 2/3

1.2908

3.4

25.82

QPSK 3/4

1.4521

4.6

29.04

QPSK 4/5

1.5494

5.1

30.99

QPSK 5/6

1.6153

5.6

32.31

QPSK 8/9

1.7244

6.7

34.49

QPSK 9/10

1.7460

6.8

34.49

For example:

If a link is designed to operate at an Es/No of 3.7dB during a 3.0dB fade, the 3.0dB

fade is commonly referred to as link margin. When fade conditions are not present, the link

margin is directly converted into a higher link Es/No: 3.7dB + 3.0dB margin = new Es/No of

6.7dB. This non-faded Es/No of 6.7dB allows for a much higher ModCod to be used, offering a

higher Spectral Efficiency. The corresponding Spectral Efficiencies in this example range from

1.1600 to 1.7244.

The Data Rate and Symbol Rate are related by the Spectral Efficiency as follows:

DR (Data Rate) = SR (Symbol Rate) x SE (Spectral Efficiency)

Содержание CDM-760

Страница 1: ...runking Modem Installation and Operation Manual For Firmware Version 1 7 3 or Higher IMPORTANT NOTE The information contained in this document supersedes all previously published information regarding...

Страница 2: ......

Страница 3: ...ta Documentation Update Subject Update Preface added South Korean EMC notice Errata Part Number ER CDM760 EA4 Errata documents are not revised CO Number C 0036739 Comments See attached page s The new...

Страница 4: ...ER CDM760 EA4 Rev CO C 0036739...

Страница 5: ...are images Image 1 is FW version 1 6 3 and should be used if you are using the modem s optional Packet Processor It is the default firmware the modem will boot with if you do nothing Image 2 is FW ver...

Страница 6: ...he USA Comtech EF Data 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 CDM 760 CDM 760 Advanced High Speed Trunking Modem Installation and Operation Manual For Firmware Vers...

Страница 7: ...BLANK PAGE...

Страница 8: ...nal Equipment R TTE Directive 1999 5 EC and EN 301 489 1 xxiii European Union Electromagnetic Compatibility EMC Directive 2004 108 EC xxiii European Union Low Voltage Directive LVD 2006 95 EC xxiv Eur...

Страница 9: ...11 1 3 6 1 Es No Performance 1 13 1 3 7 Adaptive Coding and Modulation ACM 1 15 1 3 8 DoubleTalk Carrier in Carrier CnC 1 16 1 3 9 Regulatory Compliance 1 16 CHAPTER 2 INSTALLATION 2 1 2 1 Unpack and...

Страница 10: ...onal 3 16 3 3 3 1 DC Operation Apply Power 3 16 3 3 3 2 DC Operation Replace the Fuses 3 17 CHAPTER 4 UPDATING FIRMWARE 4 1 4 1 Overview 4 1 4 1 1 Important Considerations Before Proceeding 4 1 4 1 2...

Страница 11: ...4 6 1 3 3 Cursor Behavior 6 4 6 2 CDM 760 Front Panel Menus 6 5 6 2 1 SELECT Main Menu 6 6 6 2 2 SELECT Configuration 6 6 6 2 2 1 CONFIG NetSpec 6 7 6 2 2 1 1 CONFIG NetSpec Network Spec 6 7 6 2 2 1 2...

Страница 12: ...ote 6 44 6 2 2 9 1 CONFIG Remote Remote Control 6 44 6 2 2 9 2 CONFIG Remote InBand 6 45 6 2 2 10 CONFIG IP 6 46 6 2 2 10 1 CONFIG IP Addresses 6 46 6 2 2 10 2 CONFIG IP SNMP 6 47 6 2 2 11 CONFIG Mask...

Страница 13: ...6 73 CHAPTER 7 ETHERNET INTERFACE OPERATION 7 1 7 1 Introduction 7 1 7 1 1 Ethernet Management Interface Protocols 7 1 7 2 SNMP Interface 7 2 7 2 1 Management Information Base MIB Files 7 2 7 2 2 SNMP...

Страница 14: ...4 4 3 7 Configuration Mask 7 43 7 4 4 3 8 Configuration Test 7 45 7 4 4 3 9 Configuration LNB Low Noise Block Down Converter 7 46 7 4 4 3 10 Configuration CID Carrier ID 7 47 7 4 4 3 11 Configuration...

Страница 15: ...Instruction Code Qualifiers 8 5 8 4 2 5 2 Target to Controller Instruction Code Qualifiers 8 5 8 4 2 6 Optional Message Arguments 8 7 8 4 2 7 End of Packet 8 7 8 5 Remote Commands and Queries 8 8 8 5...

Страница 16: ...Module CEFD P N PL 0000795 C 3 C 2 1 1 G 703 E3 T3 STS 1 PIIC Module Specifications C 4 C 2 1 1 1 General Specifications C 4 C 2 1 1 2 Interface Specifications C 4 C 2 2 OC 3 Single Multi Mode PIIC Mo...

Страница 17: ...w F 2 F 1 2 2 Requirements for Field Upgrade F 2 F 1 2 3 Field Upgrade Procedure F 3 F 2 CDM 760 High Speed Packet Processor Configuration and Operation F 9 F 2 1 CDM 760 Operational Overview F 9 F 2...

Страница 18: ...terface G 29 G 5 4 1 CDM 760 Typical Serial Remote Control Overview G 29 G 5 4 2 ACM Configuration and Operation Using Serial Remote Control Commands Queries G 30 G 6 ACM Summary of Specifications G 3...

Страница 19: ...nalyzer J 17 J 5 3 Calculating CnC Ratio and PSD Ratio from Satmaster J 18 J 6 DoubleTalk Carrier in Carrier Specifications J 18 J 7 Carrier in Carrier Summary J 18 J 8 Glossary J 19 APPENDIX K QUALIT...

Страница 20: ...igure 1 1 CDM 760 Advanced High Speed Trunking Modem 1 1 Figure 1 2 CDM 760 Dimensional Envelope 1 4 Figure 1 3 CDM 760 Front Panel View 1 5 Figure 1 4 CDM 760 Rear Panel View 1 6 Figure 1 5 70 140 MH...

Страница 21: ...Page 7 31 Figure 7 17 Configuration Routing DNS Page 7 32 Figure 7 18 Configuration WAN QoS Page Max Priority Min Max Modes 7 34 Figure 7 19 Configuration WAN QoS Page DiffServ Mode 7 38 Figure 7 20...

Страница 22: ...tworking Loop with Switches D 2 Figure D 2 CDM 760 Architecture InBand Disabled D 3 Figure D 3 CDM 760 Switching InBand Disabled D 4 Figure D 4 CDM 760 Architecture InBand Enabled D 4 Figure D 5 Impro...

Страница 23: ...nd 36MHz Transponder L 10 Figure L 11 Link Margin Increase for 32 APSK DVB S2 EB 1 ModCods C Band 36MHz Transponder L 11 TABLES Table 1 1 FAST and FAST accessible Hardware Options 1 8 Table 3 1 CDM 76...

Страница 24: ...c K 7 Table K 5 Example 1 Solution Calculated BW Allocation K 7 Table K 6 Example 2 QoS Classification K 8 Table K 7 Example 2 Solution Calculated BW Allocation K 8 Table K 8 Example 3 QoS Classificat...

Страница 25: ...Table of Contents Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 CD CDM760 xx BLANK PAGE...

Страница 26: ...ademarks are the property of the trademark owners DoubleTalk is licensed from Raytheon Applied Signal Technology DoubleTalk is a registered trademark of Raytheon Applied Signal Technology Carrier in C...

Страница 27: ...fety standard Electrical Installation CAUTION CONNECT THE UNIT TO A POWER SYSTEM THAT HAS SEPARATE GROUND LINE AND NEUTRAL CONDUCTORS DO NOT CONNECT THE UNIT WITHOUT A DIRECT CONNECTION TO GROUND Clas...

Страница 28: ...quipment and Telecommunications Terminal Equipment R TTE Directive 1999 5 EC and EN 301 489 1 Independent testing verifies that the unit complies with the European Union R TTE Directive its reference...

Страница 29: ...e pole Neutral Fusing ACHTUNG Zweipolige bzw Neutralleiter Sicherung International Symbols Symbol Definition Symbol Definition Alternating Current Protective Earth Fuse Chassis Ground For additional s...

Страница 30: ...g Modem MN CDM760 xxv Product Support For all product support please call 1 240 243 1880 1 866 472 3963 toll free USA Comtech EF Data Headquarters http www comtechefdata com Comtech EF Data Corp 2114...

Страница 31: ...ch EF Data Corporation The warranty does not apply to any product or parts thereof where the serial number or the serial number of any of its parts has been altered defaced or removed The warranty doe...

Страница 32: ...mes from 64 bytes to 10 000 bytes and processes Ethernet frames 600 000 packets second or 1 2 Million packets second when run in a duplex setting DVB S2 has been widely accepted as one of the most spe...

Страница 33: ...llite carriers This technology which is a standard feature on the CDM 760 was adopted by the DVB organization and is now a DVB DVB CID and ETSI TS 103 129 standard to assist in the control of satellit...

Страница 34: ...or Decoder Card PL 0000626 PIIC Motherboard Assembly KT 0000150 AC Power Supply for modem not BUC 1 2 1 2 Optional Assemblies Assembly Description Where Installed PL 0000572 Carrier in Carrier Card In...

Страница 35: ...Introduction Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 1 4 1 2 2 Dimensional Envelope Figure 1 2 CDM 760 Dimensional Envelope...

Страница 36: ...e LEDs show a summary status of modem operation 2 Keypad The keypad has six individual keys The keys have a positive click action that gives tactile feedback Use the keypad to enter data 3 Vacuum Fluo...

Страница 37: ...Features Utility and Traffic Data Interfaces 1X J1 ALARM DB 15M connector for Form C unit alarms analog Es No and Tx Mute 1X J3 REMOTE DB 9F EIA 232 connector for serial remote control 1X J4 MGMT 10...

Страница 38: ...ctor for interoperability with a separately purchased Comtech EF Data redundancy switch o For 1 1 redundant applications the CDM 760 is supported by the CRS 170A Redundancy Switch for L Band operation...

Страница 39: ...Fully Accessible System Topology Feature upgrade process Table 1 1 FAST and FAST accessible Hardware Options Description and Comments Option Installation Method ACM Advanced Coding and Modulation Poi...

Страница 40: ...9 9 10 to 120 Msps 314 2 Mbps max 16 APSK 19 30 2 3 127 180 3 4 4 5 5 6 31 36 8 9 9 10 to 90 Msps 313 5 Mbps max 32 APSK 127 180 3 4 4 5 5 6 31 36 8 9 9 10 to 72 Msps 313 7 Mbps max 64 APSK 4 5 5 6 31...

Страница 41: ...Band Type N female L Band Monitor Type SMA female Traffic Data Interface 2X RJ45 10 100 1000 BaseT Ethernet 1X Optical Gigabit Ethernet optional Note All Data GigE interfaces have a maximum Ethernet...

Страница 42: ...r Phase Noise Frequency Offset dBc Hz Frequency Offset dBc Hz 10 Hz 36 10 kHz 86 100 Hz 66 100 kHz 96 1 kHz 76 1 MHz 96 BUC 10 MHz Reference FUTURE Frequency Offset dBc Hz Frequency Offset dBc Hz 1 3...

Страница 43: ...Introduction Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 1 12 Figure 1 5 70 140 MHz Input Level vs Symbol Rate Figure 1 6 L Band Input Level vs Symbol Rate...

Страница 44: ...0 12 174 00 1 16 1 8 2 4 2 3 0 1 150 0 13 193 70 1 29 2 2 3 3 3 4 0 1 150 0 15 217 80 1 45 2 6 4 2 4 5 0 1 150 0 15 232 40 1 55 3 0 4 9 5 6 0 1 150 0 16 242 30 1 62 3 3 5 4 8 9 0 1 150 0 17 258 60 1 7...

Страница 45: ...1 120 0 18 220 80 1 84 3 9 6 5 2 3 0 1 120 0 19 232 80 1 94 3 9 6 8 127 180 0 1 120 0 21 246 00 2 05 4 7 4 5 7 8 7 6 3 4 0 1 120 0 22 261 60 2 18 4 7 8 1 4 5 0 1 120 0 23 278 40 2 32 5 3 9 0 5 6 0 1...

Страница 46: ...1 54 2 57 4 5 8 6 25 36 0 1 90 0 27 241 25 2 68 5 3 9 6 13 18 0 1 90 0 28 250 96 2 79 5 5 10 0 7 9 0 1 90 0 30 270 38 3 00 6 1 10 9 77 90 0 1 90 0 33 297 56 3 31 7 1 12 3 32APSK 2 3 L 0 1 72 0 32 231...

Страница 47: ...on frequency Different symbol rates are allowed Symbol Rate Range 0 1Msps to 63 Msps CnC Ratio Ratio of Interferer Carrier Power to Desired Carrier Power in dB Positive values represent a stronger Int...

Страница 48: ...Installation and Operation Manual otherwise available online at http www comtechefdata com and its power cord were packaged and shipped in a reusable cardboard carton containing protective foam spacin...

Страница 49: ...rails Comtech EF Data s optional KT 0000168 4 or KT 0000195 10 Rear Support Brackets Kit Figure 2 3 Comtech EF Data s optional FP SL0006 Bearingless Rack Slide Set Figure 2 4 For information about cus...

Страница 50: ...Trunking Modem MN CDM760 2 3 Feature Description 1 Custom Rack Enclosure 2 CDM 760 Unit 3 Standard Rack Shelving 4 Rack Enclosure Threaded Front Rail typical 5 Unit Front Panel 6 User supplied Screws...

Страница 51: ...3 Plate Adapter 2 4 4 HW 10 32X3 8FLT Screw 10 Flat Head 3 1 KT 6228 2 4 Rear Support Bracket Kit 1 KT 6228 3 10 Rear Support Bracket Kit KT 6228 X Rear Support Bracket Kit Item Quantity CEFD Part Num...

Страница 52: ...iption 1 Assemble the Adapter Plates to the back sides of the CDM 760 chassis using the 10 Flat Head Screws 2 Assemble the 10 Shoulder Screws through the Adapter Plate mounting slots using the 10 Flat...

Страница 53: ...l the slide set Figure 2 4 Step Task 1 Use the provided mounting hardware to install one slide onto each side of the CDM 760 chassis 2 Use the provided mounting hardware to install the slide rail comp...

Страница 54: ...ouble shielded from end to end ensuring a continuous ground shield 3 1 1 Coaxial Cable Connections Coupling Type Connector Type Plug Jack Bayonet Type BNC shown Threaded Type N shown Figure 3 1 Coaxia...

Страница 55: ...Coupling Connections Engage the plug onto the jack threads and then turn the plug clockwise until it is fully threaded onto the jack Do not over tighten the connection 3 1 1 1 Type BNC BNC plugs and j...

Страница 56: ...re connection to the jack nuts provided on the mating chassis receptacle The jack screws may be hand tightened or tightened with a standard flat blade screwdriver Connection Instructions Orient the pl...

Страница 57: ...9 L BAND RX IN Type N female IF Input J11 IF RX IN BNC female 70 140MHz band J12 L BAND TX OUT Type N female IF Output J13 IF TX OUT BNC female 70 140MHz band J10 TX MON Type SMA female Monitor L Band...

Страница 58: ...L Band I J11 IF RX IN BNC Rx IF signal 70 140 MHz band Note 75 default 50 optional 3 2 1 2 Tx Connectors The J12 L BAND TX OUT Type N connector features an LED labeled BUC PWR ON Reserved for FUTURE...

Страница 59: ...Mute Has internal pull up in the Modem Compatible with LVTTL or relay pull down I 2 AGC NOT AVAILABLE AGC Voltage Rx signal level 0 to 10 volts monotonic O 10 N C No Connection 3 RX Q Rx Q Channel Con...

Страница 60: ...Input 8 SER_DATA Fault Serial Data Signal from modem LVTTL Output 3 TX_IF_MUTE_B Capability to mute modem s Tx IF Low Mute Use pull up on Modem side input LVTTL Input 7 SER_CLK Fault Serial Clock Sig...

Страница 61: ...rence Connector BNC The J8 EXT REF Type BNC female input output connector is used to supply a master reference to the entire chassis The internal 10 MHz reference is phase locked to this input if sele...

Страница 62: ...7 or different duplex operation e g half duplex on J5 and full duplex on J7 Doing so can cause a degradation in speed performance of the data link traffic The RJ 45 female J5 DATA and J6 DATA connecti...

Страница 63: ...standard SFP Small Form Factor Pluggable interface 3 2 3 2 1 Optional Optical Gigabit Ethernet Interface P N IC 0000058 Figure 3 4 Typical SFP Module Installation The optional Optical Gigabit Etherne...

Страница 64: ...iption PL 0000795 G 703 BNC E3 T3 STS 1 PIIC Module KT 0000255 SFP STM 1 Copper BNC PIIC Module KT 0000256 SFP OC 3 Single Mode PIIC Module KT 0000257 SFP OC 3 Multi Mode PIIC Module PL 0022015 DVB AS...

Страница 65: ...ry equipped with the optional High Speed Packet Processor card It is also available as a field upgrade using CEFD Kit KT 0020958 The card installs into the modem rear panel chassis space otherwise occ...

Страница 66: ...terface Use the 10 32 stud located adjacent to the power interface Figure 3 8 for connecting a common chassis ground among equipment CAUTION CORRECT GROUNDING PROTECTION IS REQUIRED TO PREVENT PERSONA...

Страница 67: ...nC module and 48 volt BUC FUTURE supply installed 300 watts max Input Voltage 100V to 240V AC 6 10 autosensing total absolute max range is 90V to 264V AC Connector Type IEC Fuse Protection Line and ne...

Страница 68: ...the AC Fuses WARNING DEATH OR PERSONAL INJURY POSSIBLE DISCONNECT THE POWER SUPPLY BEFORE PROCEEDING CAUTION ALWAYS REPLACE THE FUSES WITH THE CORRECT TYPE AND RATING SEE FIGURE 3 9 FOR THE AC FUSE SP...

Страница 69: ...minimum wires are recommended 2 Connect the user supplied DC power leads to the user power source 3 Switch the unit ON Feature Description 1 On Off Switch 2 Power Terminal Block 3 Screw in Fuse Holder...

Страница 70: ...ONAL INJURY POSSIBLE DISCONNECT THE POWER SUPPLY BEFORE PROCEEDING CAUTION ALWAYS REPLACE THE FUSES WITH THE CORRECT TYPE AND RATING SEE FIGURE 3 12 FOR THE DC FUSE SPECIFICATIONS To replace the DC fu...

Страница 71: ...Rear Panel Connections Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 3 18 Notes...

Страница 72: ...ly as to how you may proceed with the firmware update process FW UPDATE PATH FW UPDATE PROCESS USES NEXT FW GATEWAY YOU MUST UPDATE TO BEFORE UPDATING TO A LATER FW 1 1 1 FTP CLIENT Filezilla 1 2 1 Fr...

Страница 73: ...or when the optional High Speed Packet Processor is installed and enabled the P0 MGMT RJ 45 M C port Do these steps 1 Download the firmware update archive file via the Internet to the User PC Except...

Страница 74: ...rear panel J4 MGMT 10 100 1000 Fast Ethernet port to an Ethernet port on the User PC Alternately when the optional High Speed Packet Processor is installed and enabled use an Ethernet hub switch or d...

Страница 75: ...192 001 001 100 You are not able to use the HTTP Interface to change the Modem IP Address o Firmware Information Use the SELECT Utility Firmware Info Image 1 or Image 2 screens as shown in this examp...

Страница 76: ...or the Command Prompt see Section 4 2 1 4 4 1 These examples specify drive letter c You can use any valid writable drive letter 2 Typical for many of the tasks that follow type the command as instruc...

Страница 77: ...ew temporary folder in the active location 3 Right click the New Folder folder name and then Rename this folder to CDM760 or some other convenient unused name 4 2 1 4 3 Use the Run and Browse Windows...

Страница 78: ...Command Prompt 3 From the c prompt type either mkdir CDM760 or md CDM760 both mkdir and md mean make directory and then press Enter There will now be a CDM760 folder created and available for placemen...

Страница 79: ...wnload of self extracting exe files Download the zip file instead and extract the firmware files from the archive download with the Windows based archive application or a user supplied file archiver a...

Страница 80: ...files in the temporary folder There are several ways you can view the contents of the temporary folder on a Windows based PC To use the Windows Desktop see Section 4 3 1 To use Windows Command line or...

Страница 81: ...Remote Control Interface You may also use the HTTP Interface Admin Access page to view the configured IP Address as needed Note that you cannot use the HTTP Interface to change the Modem IP Address Y...

Страница 82: ...through 1 3 1 The file transfer process takes about 10 minutes do not power off the PC or modem during this time As the upgrade process continues the modem Front Panel displays Programming ModemApp XX...

Страница 83: ...t FTP Upload Procedure For Firmware Version 1 4 1 and later the Administrator may use the Admin Upgrade page to manage the CDM 760 Firmware Upgrade process Figure 4 1 HTTP Interface Admin Upgrade page...

Страница 84: ...firmware image as the Current Active Image Use the arrow keys to select 1 or 2 In this example Image 1 was just updated so therefore 1 is your required choice Press ENTER Alternately click Set Image1...

Страница 85: ...em in the Firmware Image Config section of the HTTP Interface Admin Upgrade page Note that if booting into a new image and the Top Card Application has been changed an additional step occurs as the CD...

Страница 86: ...out removing a unit from the setup FAST technology allows you to order a unit precisely tailored for the initial application When your service requirements change you can upgrade the topology of the u...

Страница 87: ...n about using this product management interface Do these steps 1 Before contacting Comtech EF Data Product Support to order FAST feature upgrades obtain and record the modem s baseboard serial number...

Страница 88: ...en ENTER c Press ENTER to execute the FAST upgrade The modem responds with Configured Successfully if the FAST upgrade is accepted the modem then resets to its newly incorporated default configuration...

Страница 89: ...nvoice the register specific 20 digit FAST Access Code s and the FAST option activation instructions 4 Enter the FAST Access Code s a Log in to the CDM 760 HTTP Interface and open the Admin FAST page...

Страница 90: ...em operations 2 Keypad Use the keypad to ENTER data The keypad has six individual keys The keys have a positive click action that gives tactile feedback 3 Vacuum Fluorescent Display VFD The VFD shows...

Страница 91: ...g normally demodulator and decoder are locked everything is OK Off An Rx Traffic fault exists the demodulator may still be OK A demodulator unlock is a fault even though it is likely due to a missing...

Страница 92: ...figuration change that you have not yet executed using ENTER Press CLEAR to return to the previous menu screen Press CLEAR repeatedly to return to the opening screen Left Right keys On any menu screen...

Страница 93: ...ur of showing the same screen the screen saver activates Circuit ID Demodulator not locked CnC is OFF Press an The screen saver message moves from right to left across the screen and then repeats The...

Страница 94: ...x Intf CnC Comp DPD Remote IP Mask Ref MEO Select to fully configure the modem Monitor Monitor Live Alarms Stored Events ACM Rx Params CnC Stats Buffer MEO DPD Use to monitor the status of the modem a...

Страница 95: ...m Earth Orbit MEO operating modes Tx Transmit Use to define the Tx configuration of the unit on a per parameter basis Rx Receive Use to define the Rx configuration of the unit on a per parameter basis...

Страница 96: ...a Rate Range columns When you select a Network Specification other than what is active the front panel displays this message Configuring Network Specification Please Wait 6 2 2 1 2 CONFIG NetSpec Oper...

Страница 97: ...to make your selection Valid settings are QPSK 8PSK 16APSK 32APSK or ACM The 16APSK 32APSK and ACM Adaptive Coding and Modulation settings require that the unit is already configured to permit these...

Страница 98: ...uld consider the use of Short Block Framing only when there is a concern about data latency In all other circumstances Normal Block Framing should be used See Figure C 4 Single Hop Latency in Appendix...

Страница 99: ...ee Section 6 2 2 4 1 about entering or exiting MultiStream Mode Equation Example top line For the ETH_DR MIN_DR TOT_DR RO equation ETH_DR Ethernet Data Rate This is always TOT_DR MIN_DR It is all data...

Страница 100: ...ymbol Rate You can change the Tx Symbol Rate while the modem is in MultiStream Mode The modulator turns the Tx Carrier OFF while programming Tx Symbol Rate 30000 000 ksps Use the arrow keys to select...

Страница 101: ...232 40 1 55 3 0 4 9 5 6 0 1 150 0 16 242 30 1 62 3 3 5 4 8 9 0 1 150 0 17 258 60 1 72 4 0 6 4 9 10 0 1 150 0 17 261 90 1 75 4 2 6 6 8PSK 3 5 0 1 120 0 17 208 80 1 74 3 4 5 8 2 3 0 1 120 0 19 232 30 1...

Страница 102: ...5 0 1 120 0 17 208 80 1 74 3 4 5 8 19 30 0 1 120 0 18 220 80 1 84 3 9 6 5 2 3 0 1 120 0 19 232 80 1 94 3 9 6 8 127 180 0 1 120 0 21 246 00 2 05 4 7 4 5 7 8 7 6 3 4 0 1 120 0 22 261 60 2 18 4 7 8 1 4 5...

Страница 103: ...5 7 7 16APSK 1 2 L 0 1 90 0 19 173 29 1 93 3 5 6 3 8 15 L 0 1 90 0 21 184 94 2 05 3 7 6 8 5 9 L 0 1 90 0 21 192 71 2 14 3 8 7 1 26 45 0 1 90 0 22 200 47 2 23 4 4 7 9 3 5 0 1 90 0 23 208 24 2 31 4 7 8...

Страница 104: ...t change the spectral inversion selection while CnC mode is ON The modem rejects any attempt at changes CONFIG Tx Freq Tx Tx Alpha Filter Rolloff Factor Use the arrow keys to set the Tx Press ENTER Va...

Страница 105: ...l to set the modem s output power level to be the same as the Tx power level value configured with CONFIG Tx Power Level CONFIG Tx Power PowerControl AUPC Select AUPC to place the modem in AUPC Automa...

Страница 106: ...only changed in increments of 0 1 dB to avoid hunting around the correct set point The maximum change per message 1X second in GEO mode and 1X 250 ms in MEO Mode will be 1 dB Any request for more than...

Страница 107: ...power level 2 While selecting Max may be better for carrier recovery it can also lead to transmission of excessive power when the issue is not Uplink Fade such as a remote site power outage CONFIG Tx...

Страница 108: ...ange of the modem Use the arrow keys to set the value Press ENTER Valid settings are Range Step Size Minimum Maximum 0 00 dB 40 0 dB 0 1 dB 6 2 2 2 5 CONFIG Tx ACM Adaptive Coding and Modulation Appen...

Страница 109: ...modulator to find the optimum ModCod CONFIG Tx ACM Config Target EsNo Margin Target Es No Margin 1 0 dB 0 0 4 5 Use the arrow keys to select a margin value Press ENTER Valid settings are Range Step Si...

Страница 110: ...vice These factors can generally be divided into two categories message processing and round trip time Message processing accounts for all ACM messaging demodulator processing ACM switching engine and...

Страница 111: ...6 CONFIG Tx WANBuff WAN Buffer Length 200 mSec Use the arrow keys to set the value of the WAN Buffer Length Press ENTER Valid settings are Range Step Size Default Minimum Maximum 20 ms 400 ms 10 ms 2...

Страница 112: ...87 capacity Pause Frames cease to be sent to the Ethernet Interfaces when the WAN Buffer Full Status drops below 75 capacity See CONFIG INTF GBEIX FlowControl in Section 6 2 2 4 2 for more information...

Страница 113: ...9 20 1 2 11 20 3 5 2 3 3 4 4 5 5 6 8 9 9 10 5 9L 26 45L 3 5 23 36 2 3 25 36 13 18 3 4 5 6 8 9 9 10 1 2L 5 9L 26 45 3 5 3 5L 28 45 23 36 2 3L 2 3 25 36 13 18 3 4 7 9 4 5 5 6 77 90 8 9 9 10 2 3L 32 45...

Страница 114: ...Normal or Inverted The active Rx Rx Alpha Filter Rolloff Factor status is read only The displayed value depends on the active network specification Network Specification Rx Rx Alpha Filter Rolloff Fa...

Страница 115: ...Packet Processor hardware options and whether Single Stream or MultiStream Operating Mode is in use When the PIIC interface slot card is installed GBEI1 GBEI2 Optical PIIC1 PIIC2 Auto Off NONE G703 E3...

Страница 116: ...nications 1000 F The GbE interface is On The PHY is up The port speed is 1000 Base T with Full Duplex communications Optional Optical Ethernet port J7 OPTICAL NONE The interface is either disabled via...

Страница 117: ...e Therefore at least one of the GbE interfaces must be active at the same time that at least one of the PIIC slots is active e g PIIC1 G703 E3 The CONFIG Intf screen display example shows the modem in...

Страница 118: ...ection the modem rejects this setting If this happens start again at Step 1 to correct the configuration B EXIT MULTISTREAM MODE Step Task 1 Use the arrow keys to select the CONFIG Intf menu 2 Make su...

Страница 119: ...ort or GBEI2 J6 DATA port Use the arrow keys to select a parameter Press ENTER CONFIG INTF GBEIX Type Take care when using this menu as a mismatch can cause random packet loss and connection drops Use...

Страница 120: ...2 4 2 1 MAC Learning Operational States CONFIG INTF GBEIX Learning Use the arrow keys to set MAC Learning as Disabled or Enabled Press ENTER With MAC Learning Disabled the modem passes any traffic Ent...

Страница 121: ...o exist in the modem s Content Addressable Memory CAM table for 5 minutes If the MAC Address is not seen traversing through the product during this five minute period the table entry is aged out and t...

Страница 122: ...s installed in its PIIC slot PIICX Type STS1 ClkSource Mask BufSize 32 0mS Center No Fill 99 On the top line the letter X in PIICX represents the slot number PIIC1 or PIIC2 containing the optional int...

Страница 123: ...row keys to select RX SAT INT CLK TX CLK or EXT CLK Press ENTER Comtech EF Data strongly suggests that you select RX SAT unless a high stability EXT CLK is present and timing of the network requires a...

Страница 124: ...tion this means that the clock source rate and the modem s programmed External Clock rate are different Use the arrow keys to set the report state for each selection as Alarm Fault Mask or Fault Tx On...

Страница 125: ...interface Use the arrow keys to select a parameter Press ENTER CONFIG INTF PIICX OC3 STM1 Type Use the arrow keys to select NONE or OC3 STM1 Press ENTER You can access these menus only when the stand...

Страница 126: ...t RxPll RxOF or RxUF Press ENTER Note the following Selection Alarm Description TxPLL The Tx Clock PLL is railed high or low meaning that the Tx Clock Source is significantly different than the rate o...

Страница 127: ...Mask BufSize 32 0ms Center No Fill 50 The Fill Status is a read only status of buffer depth reported as a percentage If the Fill Status is decreasing approaching 0 then the Rx traffic is arriving too...

Страница 128: ...t Off or On Press ENTER CONFIG INTF PIICX ASI TxMode DataRate Use the arrow keys to select a Data Rate from 1000 000 to 216000 000 kbps Press ENTER 6 2 2 4 4 3 2 CONFIG INTF PIICX ASI RxMode RxMode AS...

Страница 129: ...e rate of incoming data RxOF Rx Overflow means that the demodulator traffic is too fast for the RxClock clock setting This causes the buffer to overflow and to re center losing data in the process RxU...

Страница 130: ...w then use the arrow keys to select Yes to re center the Rx Buffer depth to 50 6 2 2 4 5 CONFIG INTF PacketProcessor Packet Processor Enabled Use the arrow keys to select the installed optional High S...

Страница 131: ...Decompression is an optional feature that requires installation of the Compression Card in the modem Compression Disabled Decompression Disabled Use the arrow keys to select a parameter Press ENTER 6...

Страница 132: ...FAST activated Tx compression The decompression setting must match the far side CDM 760 Tx compression setting A mismatch causes all data to be dropped 6 2 2 7 CONFIG DPD DYNAMIC PREDISTORTION Append...

Страница 133: ...ompression For either use the arrow keys to select operation as Disabled or Enabled Press ENTER 6 2 2 9 CONFIG Remote Remote Control Serial Ethernet Inband Disable Use the arrow keys to select Remote...

Страница 134: ...s Use the arrow keys to Enable or Disable this feature Press ENTER 1 This feature is functional only with the base unit Gigabit Ethernet data interfaces See Chapter 7 ETHERNET INTERFACE OPERATION for...

Страница 135: ...ey are used internally they violate common networking practice and they will cause network issues IP Address Range Reason this IP Address cannot be used 0 0 0 0 Non routable address per RFC 1122 127 0...

Страница 136: ...2 CONFIG IP SNMP SNMP Communities Traps Use the arrow keys to select a parameter Press ENTER CONFIG IP SNMP Communities SNMP Communities Read Write Use the arrow keys to select a parameter Press ENTE...

Страница 137: ...ct a parameter Press ENTER CONFIG IP SNMP Traps Community SNMP Traps Community Comtech 20 chars On the bottom line Use the arrow keys to select the alphanumeric character to edit and then use the arro...

Страница 138: ...or below this threshold X X X LNB This indicates that the high or low current limits for the LNB have been met X X X Ref If an external reference is selected Section 6 2 2 12 1 this indicates that th...

Страница 139: ...on the rear panel J8 EXT REF BNC connector This mode is useful when you desire to use a single frequency reference for both the modem and another piece of equipment in the system When selecting this m...

Страница 140: ...tion generated by the ACU Antenna Controller Unit Press ENTER or CLEAR to return to the previous menu Note the following Parameter Description AntId This is the identification number of the antenna th...

Страница 141: ...nts a possible alarm The character indicates the element in question is NOT in alarm The symbol indicates the element is in an alarm fault state Possible alarms are as follows Type Alarm State Unit Ma...

Страница 142: ...nd the ACU is timing out or is getting a corrupt unexpected response Ethernet Link Down One or more of the Modem s Gig E Ethernet ports J5 J6 J7 is enabled but the modem does not detect any connection...

Страница 143: ...nable disable and the alarmed demod decompression enable disable LNB Current The modem has exceeded the high or low current levels as programmed by the user LNB Voltage The modem detects that the LNB...

Страница 144: ...active ACM Mode information Parameter Description Tx Modcod Displays the Tx ModCod RemEsNo Displays the EsNo reported by the remote modem Rx Modcod Displays the Rx ModCod LocEsNo Displays the EsNo of...

Страница 145: ...dation Ratios beyond 7 dB may cause complete unlock of circuit The Delay in a properly working CnC link is typically between 230 ms and 290 ms Delay when bench testing CnC operation is typically less...

Страница 146: ...Packets received on WAN destined for GigE 1 GigE 2 M C and Opt X Bytes from WAN Total number of Bytes received on WAN destined for GBEI1 GBEI2 Optical and M C This is prior to decompression if enable...

Страница 147: ...received that contained errors with this Modulation and Coding since the last clear Rx Frames Drpped The total number of Baseband Frames received at 16APSK or 32APSK but dropped because the FAST Acce...

Страница 148: ...SK 11 30 Tx Count QPSK 2 5 Rx Count QPSK 2 5 RxErrFrms QPSK 2 5 Tx Count QPSK 77 180 Rx Count QPSK 77 180 RxErrFrms QPSK 77 180 Tx Count QPSK 83 180 Rx Count QPSK 83 180 RxErrFrms QPSK 83 180 Tx Count...

Страница 149: ...DVB S2 S2X is the active Network Spec Tx Count Rx Count RxErrFrms Rx Frames Drppd Tx Count QPSK 1 4 Rx Count QPSK 1 4 RxErrFrms QPSK 1 4 16APSK Rx Frames Drppd Tx Count QPSK 13 45 Rx Count QPSK 13 45...

Страница 150: ...16APSK 8 9 Tx Count 16APSK 9 10 Rx Count 16APSK 9 10 RxErrFrms 16APSK 9 10 Tx Count 32APSK 2 3L Rx Count 32APSK 2 3L RxErrFrms 32APSK 2 3L Tx Count 32APSK 32 45 Rx Count 32APSK 32 45 RxErrFrms 32APSK...

Страница 151: ...escription Top Line Bytes In The total number of bytes displayed in scientific notation including compression and encapsulation overhead sent to the decompressor Savings The XX percentage value is cal...

Страница 152: ...em it is linked with AntStat Antenna Status This is the status of the antenna that the modem is linked with SatId Satellite ID This is the identification number of the satellite the modem is linked wi...

Страница 153: ...l of the receive configuration parameters except Rx Spectrum Invert are temporarily changed to match those of the transmit side However no internal connection is made When Normal is again selected all...

Страница 154: ...Front Panel Operation Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 6 65 Figure 6 3 Loopback Test Modes...

Страница 155: ...ress ENTER Then use the arrow keys to select ON or OFF ON enables the BERT pattern on the modem Tx and begins the search for the BERT pattern on the demodulator Rx Patt Press ENTER Then use the arrow...

Страница 156: ...om line A location that is available to Store a configuration displays the message No Configuration exists A location that displays the message A Configuration Exists is used to Load an existing confi...

Страница 157: ...it Display Brightness 100 Use the arrow keys to select a suitable brightness level for the VFD Vacuum Fluorescent Display The available levels are 25 50 75 or 100 Press ENTER 6 2 6 3 Utility EventLog...

Страница 158: ...y modems remain in this state until you Force the switchover Auto The redundancy switch chooses which modem is Online based on fault conditions o If the original Online modem Unit A becomes faulted th...

Страница 159: ...cted This read only screen displays the status of the 1 1 switch connection Message Description Not Connected The modem is either not connected to a supported 1 1 switch or the connection is faulty Co...

Страница 160: ...modem can store two complete firmware images The read only top line shows the active firmware image On the bottom line use the arrow keys to select a parameter Press ENTER 6 2 6 8 1 Utility Firmware...

Страница 161: ...onitor PSU and 10MHz PSUmonitor Use the arrow keys to select PSU and 10MHz Press ENTER PSUmonitor is reserved for FUTURE use and is non operational at this time 6 2 7 1 1 ODU BUC PwrSupply Ref PSU and...

Страница 162: ...anel J9 L BAND RX IN Type N connector Press ENTER ODU LNB PwrSupply Ref PSU and 10MHz Alarm limits The CDM 760 constantly monitors the LNB power supply source Use this selection to define an alarm ran...

Страница 163: ...ew 2 Set View OPTIONS 3 Set View FAST options are grouped under three internal EEPROM registers Each register requires a unique FAST Access Code It is important when upgrading to enter your register s...

Страница 164: ...e register 1 2 or 3 Contact a Comtech EF Data Product Support representative to order the desired FAST options Be prepared to provide the Modem Serial Number Your Comtech EF Data Product Support repre...

Страница 165: ...ry default settings 6 2 8 3 FAST CnC FractionalCnC Time Remaining 90 00 00 00 Time Remaining Refills In 364 23 59 31 Full CnC License is installed Fractional CnC is common in 1 1 or 1 N redundancy sys...

Страница 166: ...Fractional CnC Time Remaining cannot be reset or refilled in the field Once the timer has run out your only options are to Upgrade the modem to fully functional CnC Wait until Time Remaining Refills...

Страница 167: ...Front Panel Operation Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 6 78 Notes...

Страница 168: ...er supplied hub switch or direct Ethernet cable connection o The PC is running a terminal emulation program for operation of the CDM 760 Serial Interface and a compatible web browser for operation of...

Страница 169: ...compile these MIB files in a user supplied MIB Browser or SNMP Network Monitoring System server The following MIB files are associated with the CDM 760 MIB File Name where x is revision letter Descri...

Страница 170: ...d The modem supports both SNMPv1 traps and SNMPv2 notifications You may configure the modem to send either style by using the CDM760SNMPTrapVersion OID The CDM 760 supports the following MIB2 SNMPv1 t...

Страница 171: ...ss 7 3 1 Using HyperTerminal for Telnet Remote Control Operation There is a disadvantage when using Windows Command line as a Telnet client with the optional Remote Control protocol For the messages c...

Страница 172: ...ties Figure 7 3 left a Enter the CDM 760 s Traffic Management IP Address as the Host address e g 192 168 1 1 b Enter TCP Port 23 as the Port number c Set Connect using to TCP IP Winsock instead of COM...

Страница 173: ...efore the modem grants access to the HTTP Interface it prompts you for a User Name and Password via the Login Window similar to the example shown at right Default Admin User name comtech Default Admin...

Страница 174: ...on tab then click the Interface primary page tab finally click the nested Ethernet tab 7 4 2 2 Page Sections Each page features one or more sections The title at the top of each section describes its...

Страница 175: ...ata Entry Text boxes let you type data into a field An action button may be associated with a single text box or a group of text boxes For any text box left click anywhere inside the box type the desi...

Страница 176: ...s Click any navigation tab to continue The CDM 760 HTTP Interface pages that are marked with an asterisk are functional only when you activate the optional FAST feature or accessible to Admin users wh...

Страница 177: ...r specific page when the optional High Speed Packet Processor card is not installed the following message displays Click Back to previous page to resume use of the interface If the Administrator logs...

Страница 178: ...liary or optional products installed and configured for use with the CDM 760 The subsections that follow note such conditional availability 7 4 4 1 Home Pages Click the Home navigation tab and then se...

Страница 179: ...sion 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 7 12 7 4 4 1 2 Home Contact Use this page to see the contact information phone fax or Web e mail hyperlinks for Comtech EF Data Product Supp...

Страница 180: ...m IP Maintenance Use the Ping Reply drop down list to select Enabled or Disabled o Selecting Enabled causes the CDM 760 to reply to ping requests o Selecting Disabled causes the CDM 760 to ignore ping...

Страница 181: ...n comtech comtech Host Access List The Host Access List allows you to define a list of remote client PCs which can connect to the CDM 760 via HTTP and SNMP Enter an IP Mask IP address and a subnet mas...

Страница 182: ...tring can be any combination of characters and a length of 0 to 20 characters The factory default SNMP Write Community string is private Enter an SNMP Contact Name and Location Each string can be any...

Страница 183: ...to finalize the process Firmware Image Config ReFLASH Status The messages that display here guide you through the file s PC to modem transfer process Active Image This read only item displays the act...

Страница 184: ...ister Carefully enter each register specific 20 character FAST access code in sequence and then click Enter when done The modem then displays a message on this page to indicate whether or not the code...

Страница 185: ...e pages to configure all unit parameters Click the Configuration navigation tab and then select the Modem Interface ARP Routing WAN Utilities Mask Test LNB CID or MEO tab to continue 7 4 4 3 1 Configu...

Страница 186: ...guration Interface Pages Be sure to read about Single Stream Mode vs MultiStream Mode Operation in Chapter 6 FRONT PANEL OPERATION before you attempt to use either of the Interfaces pages Use the Inte...

Страница 187: ...High Speed Trunking Modem MN CDM760 7 20 7 4 4 3 2 1 Configuration Interface Ethernet TOP Page Appearance w Functional PIICs Installed BOTTOM Page Appearance w Optional High Speed Packet Processor Ins...

Страница 188: ...et data interfaces Minimum Data Rate MIN_DR This read only value is always zero 000000 000 when the unit is in Single Stream Mode and only Ethernet Data Type is enabled If the minimum data rate is not...

Страница 189: ...at a lower PPS rate than bridged traffic User traffic passing through the P0 MGMT port cannot exceed 105 000 PPS simplex or 150 000 PPS duplex compared to bridged traffic which can run at 190 000 PPS...

Страница 190: ...enever the G 703 E3 T3 STS 1 PIIC is installed in the applicable PIIC slot Use the Interface Type drop down list to select None E3 T3 or STS1 Use the Tx Clock Source drop down list to select Tx Clock...

Страница 191: ...nce w Functional G 703 OC 3 or STM 1 PIICs Installed MIDDLE Page Appearance w Functional DVB ASI PIIC Installed Banner and Menus not shown BOTTOM Page Appearance w Optional High Speed Packet Processor...

Страница 192: ...iming of the network requires all devices to be locked to the External Clock Enter an Rx Buffer Size ms from 2 ms to 75 ms in 0 5 ms steps Click Reset Buffer to clear the Rx Buffer Click Configure PII...

Страница 193: ...w drop down list to select Alarm Fault or Mask Valid for G 703 PIICs only Use the Ext Clock Activity drop down list to select Alarm Fault Mask or Fault Tx On This indicates that the External Clock is...

Страница 194: ...that are active on a broadcast domain The modem can associate these addresses dynamically by listening to ARP responses or statically by hard coding the IP MAC Address association Figure 7 14 Configur...

Страница 195: ...nly internal table index number It is automatically assigned IP Enter a valid IP Address in the format XXX XXX XXX XXX MAC Enter a valid MAC 48 Address in the format YY YY YY YY YY YY Click Add Entry...

Страница 196: ...ess pages 2 At present only Point to Point Routing is allowed on the CDM 760 Point to Multipoint Routing will be enabled on future releases Click the Routing primary page tab and the select the Routes...

Страница 197: ...WAN or toLAN Next HOP IP Enter the desired Next Hop IP Address for toLAN routes Note that no Next Hop entry is needed for toWAN routes Click Add Entry to execute addition of the new route to the Route...

Страница 198: ...ices from accidentally being configured with the same IP Address The CDM 760 DHCP Relay feature allows you to deploy a single DHCP server at the hub that manages all of the devices throughout your rem...

Страница 199: ...ame System caching DNS caching at the remote site modem makes that modem fast accessible to recently visited web sites by storing the IP Address to URL map at the remote modem Figure 7 17 Configuratio...

Страница 200: ...ll data coming into the modem will be sent to the WAN as it is received in the order it was received for so long as the WAN can support the packet frame and data rate of the incoming traffic If there...

Страница 201: ...1 1 Configuration WAN QoS Page Max Priority Min Max Modes TOP QoS Mode Max Priority Banner and Menu Bar not shown BOTTOM QoS Mode Min Max Banner and Menu Bar not shown Figure 7 18 Configuration WAN Qo...

Страница 202: ...XXX YY Dst IP Mask Enter a Destination IP Address Mask in the form XXX XXX XXX XXX YY Min Max Src Port You should specify the Min Max Source Destination Ports only if you are aware of the port usage o...

Страница 203: ...able displays all existing QoS Rules Typical for each rule see Add New QoS Rule for detailed descriptions for each item from left to right Column Description Index This is the read only automatically...

Страница 204: ...or Enable Weight Displays the assigned weighting value from 1 to 100 Filter All Displays the flow filter setting as Disable or Enable Delete Rule This section is identical for both the Max Priority an...

Страница 205: ...de Points Class Selector Precedence Per Hop Behavior PHB This is the traffic class that determines how packets will be forwarded Codepoint DSCP This is the Codepoint value in the Type of Service ToS b...

Страница 206: ...or the Drop Precedence value b001 Med Drop Precedence full 0 99 In case of congestion the WRED is applied after the queue depth exceeds the configured percentage value assigned for the Drop Precedence...

Страница 207: ...is activated and the optional High Speed Packet Processor is installed and enabled Figure 7 20 Configuration WAN Header Compression Page Compression Availability Use the Header Compression drop down...

Страница 208: ...Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 7 41 7 4 4 3 5 3 Configuration WAN Encryption FUTURE Encryption is not available in this firmware release Figure 7 21 Configuration WAN...

Страница 209: ...onfiguration parameters available on this page Operational Feature Section Chapter 6 Section Reference Circuit ID 6 2 6 7 Utility Circuit ID Date Time 6 2 6 1 Utility Set RTC Clocks 6 2 2 10 1 CONFIG...

Страница 210: ...cause the carrier has too little or too much power X X X Es No Threshold Occurs when the Receive Es No is at or below the Receive Es No Alarm point X X X DeComp Invalid Occurs when packets are receive...

Страница 211: ...nline modem to revert to online if all faults are cleared This is used to prevent a Fractional CnC modem from draining all its fractional time if the normally online full CnC modem is no longer faulte...

Страница 212: ...n parameter controls provided on this page Web Page Section Chapter 6 Section Reference Unit 6 2 4 1 TEST Mode BERT Config 6 2 4 2 TEST BERT Off On Patt BERT Monitor 6 2 4 2 TEST BERT ErrIns Restart U...

Страница 213: ...CONVERTER is installed Use this page to configure Low Noise Block Down Converter parameters Set the desired LNB configurations Click Submit LNB Controls to save Figure 7 25 Configuration LNB Page LNB...

Страница 214: ...C where o DDD degrees 000 through 180 o MM whole minutes 00 through 60 o mm fractional minutes 0 through 99 tenths or hundredths o C compass cardinal point E East W West Enter a CID Telephone Number t...

Страница 215: ...have a G 703 PIIC plugged into PIIC Slot 1 for any MEO Operational Modes to be accessible If a G 703 PIIC is not installed in PIIC Slot 1 then this page is nonfunctional 2 This page is nonfunctional w...

Страница 216: ...tistics or Performance tab to continue 7 4 4 4 1 Status Status Use this read only page to review and monitor information pertaining to Alarms Status Click a hyperlink to view a popup window containing...

Страница 217: ...the log buffer The table then displays a single event labeled Log ERASED This page provides a scrollable table of stored events This table displays up to 256 events as follows Column Description Index...

Страница 218: ...ging Use the Logging Level drop down list to select Errors Only Errors and Warnings or All Information Click Submit to execute Clear Event Log Click Clear Log to clear the log buffer and remove all ev...

Страница 219: ...every 10 seconds to review identifying information about the modem in its current configuration including General Information Equipment ID The scrollable Installed Options window lists the installed...

Страница 220: ...operational firmware loads The Boot Firmware section provides information for the currently loaded firmware boot applications The Firmware Image 1 and Firmware Image 2 sections provide information for...

Страница 221: ...Operation Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 7 54 7 4 4 4 5 Status ACM Use this read only page to view ACM Adaptive Coding Modulation operating statistics Figure 7 33 Stat...

Страница 222: ...Header Comp Payld Comp QoS or Clear Counters tab to continue 7 4 4 4 6 1 Status Traffic Statistics Ethernet This page is available with or without the presence of the optional High Speed Packet Proces...

Страница 223: ...High Speed Trunking Modem MN CDM760 7 56 Figure 7 35 Status Traffic Statistics Ethernet Page Packet Processor Installed Enabled Click Clear to clear reset the Ethernet statistics buffers Click Refresh...

Страница 224: ...tistics buffer was cleared Current Packets s This is the total number of packets received transmitted on this port during the last 1 second Average Packets s 5 minutes This is the average number of pa...

Страница 225: ...is congested For each excessive collision count or after 16 consecutive collisions a packet is dropped 7 4 4 4 6 2 Status Traffic Statistics MAC Table Figure 7 36 Status Traffic Statistics MAC Table...

Страница 226: ...buffers Click Refresh to update the page with the latest available statistics Total Flows This section displays the type and number of active flows the Packet Processor is currently processing Summar...

Страница 227: ...ter statistics buffers Click Refresh to update the page with the latest available statistics Router Counters Item Description Received Packets Number of packets received by the Packet Processor stack...

Страница 228: ...because the IP Address in the IP Header s destination field was not a valid address to be received at this modem No Route Errors No route was found for the Destination IP Address Buffer Full Errors T...

Страница 229: ...sh to update the page with the latest available statistics Managed Switch Counters Item Description LAN Received Packets Total number of packets from the LAN to ports P1 P4 Transmitted Packets Total n...

Страница 230: ...w issues Figure 7 40 Status Traffic Statistics WAN Page Clear Statistics Click Clear to clear reset the WAN statistics buffers Click Refresh to update the page with the latest available statistics WAN...

Страница 231: ...can see how each type of defined traffic is compressing on a per rule basis Pre Comp Bytes Total byte count of all packets since last clear that meet this QoS rule Index before header compression Post...

Страница 232: ...Speed Trunking Modem MN CDM760 7 65 7 4 4 4 6 8 Status Traffic Statistics Payld Comp Payload Compression Figure 7 42 Status Traffic Statistics Payld Comp Page Click Clear Comp Decomp Stats to clear r...

Страница 233: ...e how each type of defined traffic is being processed on a per rule basis Description This description typically matches the Protocol column field in the Configuration WAN QoS page QoS Table Tx Packet...

Страница 234: ...Modem MN CDM760 7 67 7 4 4 4 6 10 Status Traffic Statistics Clear Counters Figure 7 44 Status Traffic Statistics Clear Counters Page Clear All Counters Click Clear to clear reset the statistics buffer...

Страница 235: ...d High Speed Trunking Modem MN CDM760 7 68 7 4 4 4 7 Status BB Statistics Use this read only page to view Modem Baseband operating statistics Figure 7 45 Status BB Statistics Page Click Clear Baseband...

Страница 236: ...9 7 4 4 4 8 Status Performance Pages Click the Performance primary page tab and then select the IQMon TxGraph Rx Graph or CPU Usage tab to continue 7 4 4 4 8 1 Status Performance IQMon This page provi...

Страница 237: ...Ethernet Interface Operation Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 7 70 7 4 4 4 8 2 Status Performance TxGraph Figure 7 47 Status Performance TxGraph Page...

Страница 238: ...nd Normal or Short Block being used See Appendix B Es No MEASUREMENT for detailed information about and reference tables pertaining to Spectral Efficiency Used means Capacity Used or the data rate of...

Страница 239: ...raphs The Tx Capacity Configuration Parameters graphs provides a graphical representation for some of the common configuration settings that can affect user data rate and typically do not change Pilot...

Страница 240: ...Ethernet Interface Operation Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 7 73 7 4 4 4 8 3 Status Performance RxGraph Figure 7 48 Status Performance RxGraph Page...

Страница 241: ...nction of ModCod Pilots On or Off and Normal or Short Block being used See Appendix B Es No MEASUREMENT for detailed information about and reference tables pertaining to Spectral Efficiency Used means...

Страница 242: ...onjunction with the other graphs provided on this page 7 4 4 4 8 4 Status Performance CPU Usage This page is accessible only to Admin users when the optional High Speed Packet Processor card is instal...

Страница 243: ...Ethernet Interface Operation Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 7 76 Notes...

Страница 244: ...ither the CDM 760 rear panel J4 MGMT 10 100 BaseT Ethernet port or the optional High Speed Packet Processor P0 MGMT port with a user supplied hub switch or direct Ethernet cable connection o The PC is...

Страница 245: ...er connected All the line drivers are held in high impedance mode until one and only one Target transmits back to the Controller Each Target has a unique address and each time the Controller transmits...

Страница 246: ...ill be either to return data that has been requested by the Controller or to acknowledge reception of an instruction to change the configuration of the Target The exception to this is when the Control...

Страница 247: ...llow 8 4 2 1 Start of Packet The and characters indicate the start of an issued or received packet They may not appear anywhere else within the body of the message Controller to Target This is the cha...

Страница 248: ...Target Instruction Code Qualifiers The only permitted characters are and ASCII Code 61 This character is used as the Assignment Operator AO It establishes that the Instruction Code that precedes it is...

Страница 249: ...gnize the Target responds by echoing the invalid instruction code followed by For example 0000 ABC ASCII Code 42 If the Controller issues a command to set a parameter to a particular value and the val...

Страница 250: ...eriod ASCII Code 46 the numbers 0 to 9 ASCII Codes 48 to 57 and the uppercase alphabetic characters A to Z ASCII Codes 65 to 90 may be used 8 4 2 7 End of Packet Controller to Target This is the Carri...

Страница 251: ...ime out of a pass through message to a local ODU Message ok but unit is in Ethernet mode Sect 8 5 2 Tx Parameters CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE TAR X X 8 13 TFQ...

Страница 252: ...19 SSC X X 8 26 TST X X 8 21 EDR X 8 19 LC2 X X 8 25 NPS X X 8 25 SSL X X 8 26 Sect 8 5 6 ACM Parameters CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE ACM X X 8 27 ADC X X 8 2...

Страница 253: ...DE C Q PAGE CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE BKE X 8 43 CDM X 8 43 RBP X X 8 43 ST2 X 8 44 TBP X X 8 43 BRA X 8 44 CFM X 8 43 RFO X 8 41 ST3 X 8 44 TMP X 8 41 BRM X 8 44 CRM X 8...

Страница 254: ...where TMC TMC TMC TMC TMC xx 00 ACM 01 reserved QPSK 1 4 02 reserved QPSK 1 3 03 reserved QPSK 2 5 04 QPSK 1 2 05 QPSK 3 5 06 QPSK 2 3 07 QPSK 3 4 08 QPSK 4 5 09 QPSK 5 6 10 QPSK 8 9 11 QPSK 9 10 12...

Страница 255: ...APSK 31 36 39 16 APSK 8 9 40 16 APSK 9 10 41 32 APSK 127 180 42 32 APSK 3 4 43 32 APSK 4 5 44 32 APSK 5 6 45 32 APSK 31 36 46 32 APSK 8 9 47 32 APSK 9 10 48 64 APSK 4 5 49 64 APSK 5 6 50 64 APSK 31 36...

Страница 256: ...s Tx Gold Code Sequence Index in the form xxxxxx where Gold Code Sequence Index 000000 to 262141 EXAMPLE 0 TGS 189063 TGS TGS TGS TGS TGS xxxxxx Tx Pilot TPI TPI 1 byte value of 0 or 1 Command or Quer...

Страница 257: ...where RMC RMC RMC RMC xx 00 ACM 01 reserved QPSK 1 4 02 reserved QPSK 1 3 03 reserved QPSK 2 5 04 QPSK 1 2 05 QPSK 3 5 06 QPSK 2 3 07 QPSK 3 4 08 QPSK 4 5 09 QPSK 5 6 10 QPSK 8 9 11 QPSK 9 10 12 8PSK...

Страница 258: ...16 ASK 19 30 33 16 APSK 2 3 34 16 APSK 128 180 35 16 APSK 3 4 36 16 APSK 4 5 37 16 APSK 5 6 38 16 APSK 31 36 39 16 APSK 8 9 40 16 APSK 9 10 41 32 APSK 127 180 42 32 APSK 3 4 43 32 APSK 4 5 44 32 APSK...

Страница 259: ...y available when NET 0 EXAMPLE 0 RAR 0000 RAR 0 reports Rx Alpha Rolloff of 20 RAR RAR RAR RAR x Rx Gold Code Sequence Index RGS RGS 6 bytes Command or Query Sets or returns Rx Gold Code Sequence Inde...

Страница 260: ...or compression efficiency EXAMPLE 0 CSA RESPONSE EXAMPLE 1 0000 CSA 2 0E 03 1 0E 03 50 50 RESPONSE EXAMPLE 2 0000 CSA X XE XX X XE XX XX XX If the Compression Option Card is not present then all numer...

Страница 261: ...mand Response to Query IP Statistics N A ST1 143 bytes Query only Returns all IP Statistics with each parameter separated by a colon in the form x xE xx for each parameter is GBEI1 Parameters Packets...

Страница 262: ...Multistream mode Ethernet only EDR ADR In non MultiStream mode G703 E3 EDR 00000 000 kbps N A EDR xxxxxx xx x Total or Aggregate Data Rate MultiStream Mode N A ADR 10 bytes Query only Applies to Multi...

Страница 263: ...and A thru Z CID CID CID CID CID x Date DAY DAY 6 bytes Command or Query Sets or returns a date in the form ddmmyy European format where dd day of the month 01 31 mm month 01 12 yy year 00 99 EXAMPLE...

Страница 264: ...arm Mask MSK MSK 36 bytes Command or Query Sets or returns unit alarm masks in the form abcdefgxxxxxxxxxhijklmxxxxnopqrsxxxx where Unit Alarm mask conditions in form abcdefg where a Rx AGC Alarm b Es...

Страница 265: ...ndant switch 2 Masked Ignore alarm or fault 3 Unmasked Fault Tx On causes redundant switch but leaves Transmit output power on NOTE Masks for alarms that are not applicable to various interface types...

Страница 266: ...ts log THIS COMMAND TAKES NO ARGUMENTS IEP IEP IEP N A Event Log Style ELS ELS 1 byte value of 0 or 1 Command or Query Sets or returns the EventLog Style in the form x where 0 Fill and Stop DEFAULT 1...

Страница 267: ...gotiate default 1 1000Mbps Full Duplex 2 100Mbps Full Duplex 3 100Mbps Half Duplex 4 10Mbps Full Duplex 5 10Mbps Half Duplex 6 Off LC2 LC2 LC2 LC2 LC2 x Negotiated Port Status N A NPS 2 bytes Query on...

Страница 268: ...SWC SWC SWC x SNMP Trap Community STC STC 1 to 20 bytes characters no spaces Command or Query Sets or returns SNMP traps community string NOTE Empty string is not allowed EXAMPLE 0 STC Comtech STC STC...

Страница 269: ...or 1 Command or Query Enables or Disables CnC in the form x where 0 Off 1 On NOTES 1 CnC may be enabled only if the optional plug in hardware CnC card has been installed AND a CnC FAST option is unloc...

Страница 270: ...CM ACM ACM ACM ACM mmMMA TT ACM Degradation Configuration ADC ADC 10 bytes Command or Query Sets or returns ACM configuration parameters in the form qqeesstt where qq QPSK degradation in dB from 0 0 t...

Страница 271: ...Command or Query Sets or returns the Nominal Power Value in the form sxx x where s sign or xx x Value in the range from 40 0 dBm to 0 0 dBm L Band or 25 0 dBm to 0 0 dBm 70 140 MHz EXAMPLE 0 ANP 12 5...

Страница 272: ...ck EXAMPLE 0 RCK 12 Slot 1 Rx Sat Clock is selected RCK RCK RCK RCK RCK x Tx Interface Clock source TCK TCK s 2 bytes Command or Query Sets or returns Tx Clock Source for Data Rate accuracy where s In...

Страница 273: ...the symbol rate based on the modulation type code rate framing and pilots to keep the selected data rate NOTE Commands are valid only with the appropriate PIIC interface as indicated above In addition...

Страница 274: ...mand or Query ASI PIIC only Sets or returns Rx ASI Mode in the form sx where s Interface Slot where 1 Slot 1 2 Slot 2 x Mode where 0 Off 1 ASI Normal PRM PRM PRM PRM PRM x PIIC Tx ASI Mode PTM PTM s 1...

Страница 275: ...ate to 210Mbps PRD PRD PRD PRD PRD dddddd d dd PIIC Tx ASI Data Rate PTD PTD s 10 bytes numeric Command or Query ASI PIIC only Sets or returns Tx ASI Data Rate in kbps in the form dddddd ddd EXAMPLE 0...

Страница 276: ...PP P Tx Power Level X Tx Carrier State ffff ffff Rx Frequency ssssss sss Rx Symbol Rate mm Rx ModCod b Rx Framing Mode v Rx Spectrum Inversion a Rx Alpha Rolloff gggggg Rx Gold Code ee e Es No Alarm P...

Страница 277: ...several possible types of PIIC interfaces available The first bit of each 20 bit field determines the PIIC interface type 0 means no interface detected non zero means an interface type was detected 2...

Страница 278: ...se to Query Configuration Save CST N A 1 byte value of 0 thru 9 Command only Stores the current modem configuration in Configuration Memory location defined by the one byte argument 0 to 9 EXAMPLE 0 C...

Страница 279: ...the form x where 0 OFF 1 13V LNB Voltage 2 18V LNB Voltage 3 24V LNB Voltage LPS LPS LPS LPS LPS x LNB Low Current Limit LNL LNL 3 bytes Command or Query Sets or returns Low Current Limit in the form...

Страница 280: ...01 01 Bulk2 01 01 01 SWR SWR Boot xx x x xx AppLoader xx x x xx Bulk1 xx xx xx Bulk2 xx xx xx Firmware information N A FRW 1 FRW 2 FRW B 434 or 74 bytes Query only Returns firmware information for ima...

Страница 281: ...EFGHIJKLMNOPQUSTUVWXYZ where AAAA 0760 the modem model number Installed hardware B Modulator 0 not present 1 present C Demodulator 0 not present 1 present D Gzip 0 not present 1 present E Packet Proce...

Страница 282: ...54 Msps 5 72 Msps 6 110 Msps 7 150 Msps P Tx Modulation3 Q Rx Modulation3 30 None 1 QPSK 8PSK 2 QPSK 8PSK 16 APSK 3 QPSK 8PSK 16 APSK 32 APSK 4 QPSK 8PSK 16 APSK 32 APSK 64 APSK R Modulator 0 not inst...

Страница 283: ...the timer hits zero CnC will be disabled until the current 365 day period expires When the current 365 day period expires the fractional timer will automatically reset to 90 days N A FCC DD HH M M SS...

Страница 284: ...ator is unlocked EXAMPLE 0 RFO 002 3 selects 2 3 kHz N A RFO sxxx x Temperature N A TMP 3 bytes Query only Returns the highest of 4 temperature sensors Value of the internal temperature sensor in the...

Страница 285: ...h OC3 or ASI interface bbbbbbbb Tx status 00000000 No Faults 80000000 Input Data 40000000 Tx PLL 20000000 PIIC1 Symbol Clock PLL 10000000 PIIC2 Symbol Clock PLL 08000000 PIIC1 Input Signal Loss 040000...

Страница 286: ...lay is returned in the form xxxxxx EXAMPLE 0 CDM RESPONSE EXAMPLE 1 0000 CDM 229500 returns 229 500 s or 229 5 ms RESPONSE EXAMPLE 2 0000 CDM 999999 not locked or CnC not enabled N A CDM xxxxxx CnC Fr...

Страница 287: ...x where 0 off 1 on EXAMPLE 0 BTX 1 BERT On BTX BTX BTX BTX BTX x BERT Pattern Sync N A RPS 1 byte value of 1 or 2 Query only Returns the BER Test Pattern Sync Status in the form x where 1 pattern sync...

Страница 288: ...ironment this command forces an online unit offline If the unit is offline then no action is taken NOTES 1 The 1 1 redundancy system must be installed 2 Both online and offline units must be in Manual...

Страница 289: ...itude in Minutes ss ss Latitude in decimal Seconds h Hemisphere N or S EXAMPLE 0 LAT 3325 43N LAT LAT LAT LAT LAT mmss ssh Carrier ID Longitude LNG LNG 9 bytes Command or Query Sets or returns Longitu...

Страница 290: ...mmand Response to Query Dynamic Predistortion DPD Mode PDM PDM 1 byte value of 0 or 1 Command or Query Sets DPD mode in the form x where 0 Off 1 Local 2 Remote NOTES 1 DPD may be enabled only if the o...

Страница 291: ...Serial Interface Operation Revision 3 CDM 760 Advanced High Speed Trunking Modem MN CDM760 8 48 Notes...

Страница 292: ...and initial preparation steps that are typical for any firmware update process Make sure that you first read Sects 4 1 through 4 3 in Chapter 4 UPDATING FIRMWARE before attempting to update your obso...

Страница 293: ...CDM 760 Front Panel or the Serial Remote Control Interface You may also use the CDM 760 HTTP Interface Admin Access page to review and reconfigure this IP Address as needed You have downloaded or othe...

Страница 294: ...he proper working folder directory created earlier if not type cd CDM760 Type ftp xxx xxx xxx xxx where xxx xxx xxx xxx is the CDM 760 Ethernet Management IP Address If Command line prompts you for a...

Страница 295: ...f the following queries o Condensed 0 SWR displays firmware versions o Detailed 0 FRW 1 for Image 1 or 0 FRW 2 for Image 2 displays complete firmware load information A 2 3 Select the Updated Firmware...

Страница 296: ...following methods For a hard reboot Use the rear panel ON OFF switch or otherwise disconnect the modem power source and then reconnect the modem power For a soft reboot From the Firmware Image Config...

Страница 297: ...45 M C and data connections is not available to FW Ver 1 1 1 users o The PC is running a compatible Web browser e g Internet Explorer 8 or later for operation of the CDM 760 HTTP Interface o The PC s...

Страница 298: ...tility The screen shots featured in this appendix depict use of FileZilla Version 3 5 3 but any later version will suffice Feature Description Feature Description 1 Toolbar 4 Local pane 2 Quick connec...

Страница 299: ...e drop down list is set to Use plain FTP For Logon Type make sure the drop down list is set to Anonymous 5 Select the Transfer Settings tab to display the dialog box For Transfer Mode click the Active...

Страница 300: ...r working folder The contents of the C CDM760 folder should look like this The IMAGEx folder contains the firmware update files 2 Select File Site Manager or click the Site Manager icon Select the sit...

Страница 301: ...om the FileZilla Local site pane Click on the C CDM760 IMAGEx folder The folder contents will display in the bottom section of the pane 6 Highlight the C CDM760 IMAGEx folder contents in the bottom se...

Страница 302: ...one of these methods For a hard reboot Use the rear panel ON OFF switch or otherwise disconnect the modem power source and then reconnect the modem power For a soft reboot From the Firmware Image Conf...

Страница 303: ...FW Ver 1 1 1 page is shown here Using the Serial Remote Control Interface Execute one of these remote control queries o Condensed 0 SWR displays firmware versions o Detailed 0 FRW 1 for Image 1 or 0...

Страница 304: ...of 1 or 2 dB division Set the Resolution Bandwidth of the Spectrum Analyzer to 20 of the symbol rate Use video filtering and or video averaging to reduce the variance in the displayed trace to a low...

Страница 305: ...that follows the Co No No measured is 4 6 dB If Rate 1 2 QPSK is used this corresponds to an Es No of approximately 2 8 dB DVB S2 The relationship used to derive the table values the only simple way...

Страница 306: ...6 242 30 1 62 3 3 5 4 8 9 0 1 150 0 17 258 60 1 72 4 0 6 4 9 10 0 1 150 0 17 261 90 1 75 4 2 6 6 8PSK 3 5 0 1 120 0 17 208 80 1 74 3 4 5 8 2 3 0 1 120 0 19 232 30 1 94 3 9 6 8 3 4 0 1 120 0 22 261 40...

Страница 307: ...30 0 1 120 0 18 220 80 1 84 3 9 6 5 2 3 0 1 120 0 19 232 80 1 94 3 9 6 8 127 180 0 1 120 0 21 246 00 2 05 4 7 4 5 7 8 7 6 3 4 0 1 120 0 22 261 60 2 18 4 7 8 1 4 5 0 1 120 0 23 278 40 2 32 5 3 9 0 5 6...

Страница 308: ...29 1 93 3 5 6 3 8 15 L 0 1 90 0 21 184 94 2 05 3 7 6 8 5 9 L 0 1 90 0 21 192 71 2 14 3 8 7 1 26 45 0 1 90 0 22 200 47 2 23 4 4 7 9 3 5 0 1 90 0 23 208 24 2 31 4 7 8 3 3 5 L 0 1 90 0 23 208 24 2 31 4...

Страница 309: ...Appendix B Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 B 6 Notes...

Страница 310: ...ectrical connection between the external terrestrial device and the internal circuitry of the modulator or demodulator While the CDM 760 s available optional PIIC modules are usually ordered with the...

Страница 311: ...te operation of PIIC synchronous traffic data modules G 703 T3 E3 STM 1 OC 3 etc When the CDM 760 is factory equipped with the optional High Speed Packet Processor card it is also available as a field...

Страница 312: ...3 T3 STS 1 PIIC Module CEFD P N PL 0000795 Figure C 3 G 703 E3 T3 STS 1 PIIC Module Figure C 4 G 703 E3 T3 STS 1 PIIC Module Block Diagram Name Connector Type Description Direction I O TX IN BNC Data...

Страница 313: ...0 Mbit for ISSY Clock Options Tx Clock Tx Rx satellite or External Rx Clock Tx Rx satellite Internal or External Acquisition Range Programmed Tx rate 100 ppm Test Baseband Loopback at interface Interf...

Страница 314: ...e or Multi Mode PIIC Module Kit CEFD P N KT 000025X Figure C 7 OC 3 Single Mode or Multi Mode PIIC Module SFP Installation Use the OC 3 Single or Multi Mode PIIC module in either of the CDM 760 rear p...

Страница 315: ...1 Direction Full Duplex allowing Tx Rx only operation Connectors Duplex LC Fiber Single Mode 1300 nm spectral width 7 7 nm rms Multi Mode 1300 nm 62 5 125 m spectral width 63 nm rms Typical Distance S...

Страница 316: ...e Kit CEFD P N KT 0000255 Figure C 9 STM 1 Copper PIIC Module SFP Installation Use the STM 1 Copper PIIC module in either of the CDM 760 rear panel interface option slots The PIIC module features an S...

Страница 317: ...cription Data Rate 155 52 Mbps 20 ppm Framing and Signaling G 703 GR 253 CMI Jitter G 825 Direction Full duplex allowing Tx Rx only operation Connectors BNC F 75 Output Level 1 Vpp Typical Input Level...

Страница 318: ...4 DVB ASI Asynchronous Serial Interface PIIC Module CEFD P N PL 0022015 Figure C 10 G 703 E3 T3 STS 1 PIIC Module Name Connector Type Description Direction I O ASI IN BNC Data In I ASI OUT BNC Data O...

Страница 319: ...s Item Description Data Rate 1 216 Mbps Framing and Signaling DVB ASI 188 and 204 Byte Framing Jitter EN 50083 9 Direction Full duplex allowing Tx Rx only operation Connectors BNC F 75 Output Level 80...

Страница 320: ...n Ethernet switch maintains what is known as a Content Addressable Memory CAM table listing the MAC addresses for each switch port The Ethernet switch uses the CAM table to determine where to forward...

Страница 321: ...ion of the switches in the network will cause a Networking Loop This is problematic because a Networking Loop will cause a Broadcast Storm which shuts down the network and causes harm to devices in th...

Страница 322: ...cture for the CDM 760 when InBand is Disabled Typically the management port is configured so that management traffic is physically separated from the data traffic ports Setting InBand as Disabled faci...

Страница 323: ...s to allow the M C traffic and User Data traffic to co exist in order to monitor and control a remote site without the need for an external switch Setting InBand as Enabled facilitates this configurat...

Страница 324: ...Modem MN CDM760 D 5 Figure D 5 Improper Use of External Switch with CDM 760 InBand Enabled D 4 2 Ethernet Overhead After Ethernet packets are sent from the internal switch to the modem WAN interface...

Страница 325: ...Appendix D Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 D 6 Notes...

Страница 326: ...ovided elsewhere in this manual e g Es No RSL etc in order to focus strictly on the topic of Ethernet data traffic E 2 Data Flow Diagram Figure E 1 provides a simplified way to visualize the CDM 760 a...

Страница 327: ...e plug in modules Block 4 Terrestrial Port Processor Rx This is the counterpart to the Tx processor It forms Ethernet packets and forwards them to the Ethernet Switch Block 5 Deframer The data from th...

Страница 328: ...ull in Switch Chip 1 2 Number of VALID acceptable packets that were thrown away due to buffer full Packets from WAN to PORT 11 J5 DATA GEBI1 2 1 Breakout of packets from WAN to Port 1 J5 DATA GBEI1 an...

Страница 329: ...recovered in the Deframer Fig G 1 Block 5 E 3 5 ACM Modulator Status Item Comments Current Tx ModCod Currently active Tx ModCod Remote Es No Reading Es No from distant end E 3 6 ACM Demodulator Statu...

Страница 330: ...of PIICs the CDM 760 can instead accommodate the High Speed Packet Processor option Figure F 1 This option can be ordered at time of initial purchase the modem is shipped with the Packet Processor in...

Страница 331: ...odules G 703 T3 E3 STM 1 OC 3 etc The Packet Processor occupies the same physical chassis space within the modem as these synchronous data interfaces and therefore cannot be co installed F 1 2 High Sp...

Страница 332: ...rd from its power source Use the screwdriver to remove the chassis cover top and side fasteners Remove the cover from the CDM 760 chassis IMPORTANT Be sure to retain the cover s top and side fasteners...

Страница 333: ...r securing the Packet Processor card to these same bosses B Carefully unplug the PIIC motherboard card from its mated connector take care not to damage any components top mounted to the card or chassi...

Страница 334: ...t at any time during the upgrade process Accidental disengagement of the SDD during the upgrade process will result in failure of High Speed Packet Processor operation upon bootup of the modem The Pac...

Страница 335: ...m of the card on the chassis mounting bosses while plugging the card receptacle into its mating connector C Placement is complete once the card receptacle is fully engaged within its mating connector...

Страница 336: ...to secure the Packet Processor faceplate to the chassis rear panel 9 Make all necessary traffic and M C cable connections to the Packet Processor IMPORTANT To prepare for Packet Processor operation b...

Страница 337: ...Appendix F Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 F 8 BLANK PAGE...

Страница 338: ...keypad and VFD used only for enabling or disabling the Packet Processor Remote Control with a user supplied PC via the o CDM 760 HTTP Web Server Interface using a compatible Web browser o Ethernet ba...

Страница 339: ...a blue light with adjustable brightness Nested menus display all available options and prompt you to carry out a required action 6 1 3 Figure F 2 CDM 760 Front Panel Features With the Packet Processo...

Страница 340: ...d Packet Processor nabled The modem will boot of the High Speed Packet Processor card Packet Processor card booting Please wait Conversely if the Packet Processor is Enabled and you set the Packet Pro...

Страница 341: ...he CDM 760 is operating with the latest version firmware files The CDM 760 is connected to a user supplied Windows based PC and o The PC Ethernet port is connected to the High Speed Packet Processor P...

Страница 342: ...tricted to Admin Administrative users only If a user with Read Write or Read only user access privileges attempts to select any Packet Processor specific page the error message You do not have securit...

Страница 343: ...4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 F 14 indicates that the Packet Processor is required to access the page Figure F 4 CDM 760 HTTP Interface Menu Tree High Speed Packet Processor...

Страница 344: ...d the CDM 760 offers the maximum bandwidth efficiency F 3 1 Modes of Operation See Chapter 7 ETHERNET INTERFACE OPERATION for in depth information about the function and operation of the CDM 760 HTTP...

Страница 345: ...t use the Interf drop down list to select if the route is intended for the WAN or the LAN Select toWAN to direct the modem to receive packets via the P0 MGMT LAN port and if the packet satisfies the r...

Страница 346: ...iewed on the CDM 760 HTTP Interface Configuration Routing Routes page for the Remote Site modem should appear as follows In cases where a packet may satisfy more than one route entry the route with th...

Страница 347: ...h the ability to limit maximum traffic per priority class It enables multiple rules with the same priority where the drain can be biased rather than Round Robin The configurable weight is a user speci...

Страница 348: ...ompression can provide bandwidth savings exceeding 60 For example the 8 kbps G 729 voice codec requires 24 kbps of IP bandwidth once encapsulated into an IP UDP RTP datagram With header compression th...

Страница 349: ...Appendix F Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 F 20 Notes...

Страница 350: ...different user throughput rate Therefore in an ACM system as Es No increases or decreases so does the user data rate ACM operation is a FAST enabled option in the CDM 760 When enabled with ACM the CD...

Страница 351: ...tions can occur less than 1 of the time In such as case the operating Es No of the link is higher than needed for more than 99 of the year ACM takes advantage of this link margin by increasing the Mod...

Страница 352: ...ermine the operational ModCod as measured by the far side demod Es No reading The ModCod chosen must always operate at or above the minimum threshold for reliable communications for any given ModCod T...

Страница 353: ...all but 17 5 hours of the year Figure G 1 plots the amount of downlink fade margin versus availability for this link Figure G 1 Downlink Margin vs Average Link Availability At 99 8 availability there...

Страница 354: ...nking Modem MN CDM760 G 5 Figure G 2 User Throughput vs Time and Fades Table G 3 Turning Margin into Additional Capacity Parameter SLA Clear 2 2dB Fade 6 9dB Fade Data Rate 25 Mbps 64 Mbps 51 Mbps 31...

Страница 355: ...e demodulator decoder how to configure for the correct ModCod A far side demodulator decoder must be capable of demodulating and decoding the signal transmitted by the near side modulator without any...

Страница 356: ...Appendix G Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 G 7 Figure G 3 ACM over Satellite Generic Example...

Страница 357: ...Appendix G Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 G 8 BLANK PAGE...

Страница 358: ...o estimate that the demod was seeing at that particular time the ACM message is sent four 4 times per second In the worst case scenario due to the distance traveled over satellite and the symbol rate...

Страница 359: ...saturation This distortion also penalizes higher order ModCods 16APSK and 32APSK much more than QPSK 8PSK The default for all degradation values is 0 0dB when operating in the linear portion of the gr...

Страница 360: ...or short frames and does not support mixing frame types When operating in ACM mode ALWAYS use Normal frames at both ends of the link G 4 5 Monotonic vs Non monotonic Operation Non monotonic ModCods a...

Страница 361: ...0 1 150 0 16 242 30 1 62 3 3 5 4 10 8 9 0 1 150 0 17 258 60 1 72 4 0 6 4 11 9 10 0 1 150 0 17 261 40 1 75 4 2 6 6 8PSK 12 3 5 0 1 120 0 17 208 80 1 74 3 4 5 8 13 2 3 0 1 120 0 19 232 30 1 94 3 9 6 8...

Страница 362: ...2 3 5 0 1 120 0 17 208 80 1 74 3 4 5 8 23 19 30 0 1 120 0 18 220 44 1 84 3 8 6 4 24 2 3 0 1 120 0 19 232 32 1 94 4 0 6 9 25 127 180 0 1 120 0 20 245076 2 05 4 7 7 8 26 3 4 0 1 120 0 22 261 36 2 18 4 7...

Страница 363: ...3 5 6 3 27 8 15 L 0 1 90 0 21 184 94 2 05 3 7 6 8 28 5 9 L 0 1 90 0 21 192 71 2 14 3 8 7 1 29 26 45 0 1 90 0 22 200 47 2 23 4 4 7 9 30 3 5 0 1 90 0 23 208 24 2 31 4 7 8 3 31 3 5 L 0 1 90 0 23 208 24...

Страница 364: ...nt ModCods must be at least the amount of hysteresis the figure used for hysteresis is fixed in the CDM 760 at 0 5 dB The actual Es No values used are based on the guaranteed Es No values plus Target...

Страница 365: ...active ModCods are shown along the baseline of the plot The transition to the next higher ModCod is the Es No spec Es No Target Margin user selected hysteresis 0 5 dB modulation impairment user select...

Страница 366: ...ns to do this is by enabling Flow Control When Flow Control is Enabled the WAN buffer produces two control signals that enable and disable the sending of Ethernet Pause Frames Ethernet frames designed...

Страница 367: ...nk power but in conditions of fast fading may cause demod unlock events or highly degraded BER just prior to the switch to a lower ModCod In order to mitigate this use a increase the target Es No Marg...

Страница 368: ...K will never be attained as the symbol rate limitation for these modulation types is 90Msps and 72Msps accordingly For most geostationary non HTS High Throughput Satellites systems even the largest tr...

Страница 369: ...onfigure the CDM 760 for ACM operation Step Task 1 Make sure the Gigabit Ethernet interface is selected and enabled See Sect 6 2 2 4 2 CONFIG INTF GEBIx The GBEI1 J5 DATA and GBEI2 J6 DATA Gigabit Eth...

Страница 370: ...16APSK 0 4 dB 8PSK 0 3 dB 32APSK 0 6 dB Note The impairment for QPSK 8PSK 16APSK 32APSK 7 Once you complete Steps 1 through 6 the modem then determines the optimal set of ModCods and prunes non optima...

Страница 371: ...card is INSTALLED BUT DISABLED switch or direct cable connection to connect the use an Ethernet hub CDM 760 rear panel J4 MGMT 10 100 1000 Fast Ethernet port to an Ethernet port on the User PC Alterna...

Страница 372: ...ample is subject to change Figure G 10 CDM 760 HTTP Interface Home Page G 5 3 2 HTTP Interface ACM Pages The sections that follow provide summaries of the interface pages that provide you with monitor...

Страница 373: ...odem page to carry out the tasks explained in Sect C 5 1 If you edit any field or change any item selected from a drop down make sure to click the ACM page section s Submit action button before you le...

Страница 374: ...G 25 G 5 3 2 2 Monitor ACM Performance and Statistics The CDM 760 HTTP Interface provides several tools for you to monitor ACM operation Use the read only Status ACM Figure G 12 and Status Status Figu...

Страница 375: ...e read only Status Performance TxGraph page Figure G 14 left is particularly useful when the modem is running is ACM mode as it maps the remote Es No of the far end modem synchronously along with the...

Страница 376: ...g by the local modem Via Internal BERT Tester When using the Ethernet IP interface it is not an easy matter to verify BER performance A way to verify that the ACM link is meeting performance is by usi...

Страница 377: ...Appendix G Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 G 28 Figure G 16 Status Performance IQMon Page...

Страница 378: ...mation is transmitted Controller to Target and Target to Controller in packets Each packet contains a finite number of bytes consisting of printable ASCII characters excluding ASCII code 127 DELETE In...

Страница 379: ...ined in Chapter 8 Operand Description ACM Sets or reports ACM operating parameters ADC Sets or reports ACM degradation on configuration parameters RES Reports the value of the remote demod Es No in dB...

Страница 380: ...figurable via microprocessor switches only Max fading rate Configurable Target Es No margin from 0 0 to 4 5 dB Max ModCod update rate Updates to the MODCOD can happen up to 4 times per second no restr...

Страница 381: ...Appendix G Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 G 32 Notes...

Страница 382: ...60s running Firmware Version 1 2 1 or later fully comply with this new specification The CDM 760 with MetaCarrier is used in tandem with the Comtech EF Data MCDD 100 MetaCarrier Detection Device to pr...

Страница 383: ...ay be used to decode the DVB CID of an interfering carrier that may not be part of one s own transmission network as long as the interfering carrier has an embedded DVB CID The CDM 760 creates a compo...

Страница 384: ...r configuring Carrier ID operation Local Control via the CDM 760 Front Panel keypad and VFD Remote Control with a user supplied PC via the o CDM 760 HTTP Web Server Interface using a compatible Web br...

Страница 385: ...s a blue light with adjustable brightness Nested menus display all available options and prompt you to carry out a required action 6 1 3 Figure H 1 CDM 760 Front Panel Features Do these steps Typical...

Страница 386: ...Message d Use the arrow keys to change that character Then use the arrow keys to navigate to the next character to edit and repeat Press ENTER to save Longitude takes the form DDD MM mm C where DDD de...

Страница 387: ...erence on the satellite Providing this phone number allows a satellite operator to quickly call the person s responsible for correcting any issues 5 On the bottom line of the CID screen create a CID C...

Страница 388: ...o The PC Ethernet port is connected to either the CDM 760 rear panel J4 MGMT or the Packet Processor P0 MGMT RJ 45 10 100 1000 BaseT Ethernet port with a user supplied hub switch or direct Ethernet c...

Страница 389: ...Appendix H Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 H 8 Figure H 2 CDM 760 HTTP Interface Menu Tree Carrier ID Operation FW Ver 1 7 3...

Страница 390: ...where o DDD degrees 000 through 180 o MM whole minutes 00 through 60 o mm fractional minutes 0 through 99 tenths or hundredths o C compass cardinal point E East W West Enter a CID Telephone Number to...

Страница 391: ...Target to Controller in packets Each packet contains a finite number of bytes consisting of printable ASCII characters excluding ASCII code 127 DELETE In this context the Carriage Return and Line Fee...

Страница 392: ...anagement are identified in the following table details on using these CID specific remote commands and queries are explicitly defined in Chapter 8 Operand Description LAT Sets or returns device Longi...

Страница 393: ...Appendix H Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 H 12 Notes...

Страница 394: ...satellite circuit once the satellite and earth station parameters are fixed involves trade off between modulation and coding A lower order modulation requires less transponder power while using more b...

Страница 395: ...he end of the link where the cancellation needs to take place Normally this is both ends of the link The transponder is operated as Loopback That is each end of the link must be able to see a copy of...

Страница 396: ...g in the uplinks CnC compensates for the asymmetries up to a certain extent Figure J 1 Conceptual Block Diagram In a number of ways CnC carriers behave similar to conventional carriers in satellite li...

Страница 397: ...onventional full duplex satellite link where two carriers are placed in non overlapping channels Figure J 3 shows the same link using CDM 760s equipped with the CnC option Note now that with CnC used...

Страница 398: ...aveat to this is that the waveform must be sufficiently random CDM 760 CnC operates from 1 to 63 Msps Interference will compromise CnC links just as they do non CnC links Acquisition of the demodulato...

Страница 399: ...mage within the downlink Through advanced adaptive filtering and phase locked loop implementations it dynamically compensates for these differences by appropriately adjusting the delay frequency phase...

Страница 400: ...d that correlates the received satellite signal to a stored copy of the local modulator s transmitted signal The interference cancellation algorithm uses the composite signal and the local copy of S1...

Страница 401: ...ion ACM DoubleTalk Carrier in Carrier is fully compatible with the Adaptive Coding and Modulation ACM mode of operation in the CDM 760 CnC combined with ACM can provide 100 200 increase in average thr...

Страница 402: ...tellite Transponder Galaxy 18 123 W 13K 13K Earth Station 1 Phoenix AZ 8 1 m Earth Station 2 Phoenix AZ 8 1 m Data Rate Mbps 34 368 E3 34 368 E3 The traditional link was based on 8PSK TPC 7 8 and requ...

Страница 403: ...Appendix J Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 J 10 These are the Link parameters and LST summary for 16APSK 2 3 with Carrier in Carrier...

Страница 404: ...as possible using a lower order modulation and or FEC while meeting the CnC ratio spec Spreading the smaller carrier using a lower order modulation has multiple benefits Lower order modulation is alw...

Страница 405: ...4 6 2 Power Limited Links Carrier in Carrier can provide substantial savings even when the original link is power limited Spreading the carrier by using a lower modulation and or FEC along with lates...

Страница 406: ...summary is Item Original Link With Carrier in Carrier Savings Hub to Remote Remote To Hub Total Hub to Remote Remote to Hub Total Data Rate kbps 20 48 20 48 20 48 20 48 Modulation 8PSK 8PSK 8PSK 8PSK...

Страница 407: ...ignal Level RSL at Site B usually midrange 2 Turn OFF the carrier at Site A Turn ON the carrier at Site B CnC function is OFF at both sites Using a spectrum analyzer measure Co No No at the input to t...

Страница 408: ...erify that the CnC ratio is within spec for the CDM 760 3 Calculate the Allocated Bandwidth BW and Power Equivalent Bandwidth PEB for the duplex link BWDuplex Link Greater of BWCarrier 1 BWCarrier 2 P...

Страница 409: ...nts a stronger desired carrier The reason why the CnC ratio is an estimate when looking at BE EIRP is because BE EIRP assumes that the actual BW used and the PEB are balanced and therefore the BE EIRP...

Страница 410: ...tio C N Interferer C N Desired 10log SR Interferer SR_Desired CnC Ratio at Site A C N Link 1 C N Link 2 10log SR Link 1 SR Link 2 CnC Ratio at Site B C N Link 2 C N Link 1 10log SR Link 2 SR Link 1 Cn...

Страница 411: ...Carrier in Carrier Summary Comtech EF Data s DoubleTalk Carrier in Carrier can provide significant savings in operational expenses Takes these considerations into account when evaluating CnC CnC can o...

Страница 412: ...ires 3 MHz of Allocated BW and 4 5 MHz of PEB the Leased Bandwidth is 4 5 MHz Bandwidth Power Equivalent PEB Power Equivalent Bandwidth PEB is the transponder power used by a carrier represented as ba...

Страница 413: ...Carrier Density Co Noise No to Noise Density No unit in dB C N C No 10log B where B is bandwidth in Hz Eb No C No 10log DR where DR is data rate in bits sec C N 10log B 10log DR C N 10log SE where SE...

Страница 414: ...QEF corresponds to PER 10 7 PER packet error rate is based upon a 188 byte MPEG frame size Spectral Efficiency SE Ratio of the Data Rate to the Symbol Rate Symbol Rate Data Rate Symbol Rate and Data R...

Страница 415: ...Appendix J Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 J 22 Notes...

Страница 416: ...IP Port Number etc Block a subnet or range of subnets Block VLANs or a VLAN range Block certain traffic with MPLS EXP Multi Protocol Label Switching Experimental bits K 2 2 Traffic Shaping Traffic Sha...

Страница 417: ...ification engine is the more likely the high value services can be protected The CDM 760 offers a very flexible classification engine If a packet satisfies more than one classification Table K 1 lists...

Страница 418: ...ty traffic could be starved in times of overdriving the WAN bandwidth Or can determinations be made about the maximum and minimum levels of service you can accept on a per classification rule basis Th...

Страница 419: ...in Max mode every classification rule is assigned a Minimum Date Rate and a not to exceed Maximum Data Rate You may assign up to 32 classification rules using any combination of the classifiers listed...

Страница 420: ...weight in the range from 1 to 100 You cannot assign a null value 0 this is invalid The default value is 100 The scheduler drains more data from a weight 8 queue than a weight 7 queue under the same pr...

Страница 421: ...ata rate Max BW When the LAN egress data rate is greater than the assigned Max BW the scheduler drains the packets up to the maximum bandwidth only and drops all other packets In this scenario weight...

Страница 422: ...50000 2 Q4 14000 50000 4 Total 30000 Table K 5 Example 1 Solution Calculated BW Allocation Queue 1st Round 2nd round Nth round Final kbps Weight Given Leftover Weight Given Leftover Weight Given Lefto...

Страница 423: ...in Max as the QoS Mode Configure each queue with minimum bandwidth Min BW maximum bandwidth Max BW and weight as shown in Table K 6 The total available bandwidth is 30000 kbps Calculate each individua...

Страница 424: ...1 10000 9 24 3750 kbps Q2 10000 8 24 3334 kbps Q3 10000 7 24 2916 kbps Step 3 After the initial round of quantum distribution Q1 required only 2000 kbps so the remaining 1750 kbps is therefore returne...

Страница 425: ...lculated BW Allocation Queue 1st Round 2nd round Nth round Final kbps Weight Given Leftover Weight Given Leftover Weight Given Leftover Q1 9 1500 1500 Q2 8 1334 1334 Q3 7 1166 1166 Q4 6 1000 1000 Tota...

Страница 426: ...er Q1 9 2400 1400 1000 Q2 8 2134 134 2000 Q3 7 1866 7 826 2692 Q4 6 1600 6 708 2308 Total 30 8000 1534 13 1534 0 0 0 0 8000 Table K 11 displays the solution for Example 4 Step 1 Calculate each bandwid...

Страница 427: ...Appendix K Revision 4 CDM 760 Advanced High Speed Trunking Modem MN CDM760 K 12 Notes...

Страница 428: ...the transponder specifically the traveling wave tube amplifier TWTA diagrammed in Figure L 1 in the nonlinear saturation region The disadvantage to operating in this regime is that amplifiers suffer f...

Страница 429: ...n without using additional transponder resources A combination of any of the above to meet different objectives See Figure L 2 Predistortion works as an alternative to simply backing off a power ampli...

Страница 430: ...M 760 can train the predistorter according to either of these approaches Locally using a single modem and ground station or Remotely using two modems and ground stations Figure L 4 Satellite Training...

Страница 431: ...h system i e signal S equals signal S Then the downlink signal S is time aligned with the uplink signal such that the difference created by the satellite channel can be monitored Next based on minimiz...

Страница 432: ...is to preemptively act upon the uplink waveform so that the downlink received signal has less distortion Though the objective is similar how CFR achieves this is conceptually quite different from pred...

Страница 433: ...es the use of the modem s Rx signal chain Consequently the CDM 760 will operate in Transmit Only mode when local DPD is enabled ACM cannot be employed as a result For a remote implementation see Figur...

Страница 434: ...ions In addition to minimize False feedback acquisition keep the search delay range as narrow as possible Once the modem has reported the search delay narrow the search delay range to the nominal repo...

Страница 435: ...the DPD function OFF a Setup the receiver configuration to receive the looped back signal b Verify that the demodulator is locked c Verify that the received signal level is within specifications d Me...

Страница 436: ...ith slightly lower spectral efficiency than expected to close the link b Leave the DPD function OFF at both sites 2 Turn ON the carrier at both sites Leave the DPD function OFF at both sites a Setup t...

Страница 437: ...link margin required to accommodate transponder nonlinear effects may be reduced Second the transponder output back off OBO may be reduced Example results for a C band 36 MHz transponder are described...

Страница 438: ...72 Msps 64 points e g 64 APSK 54 Msps Remote QPSK 75 Msps 8PSK 60 Msps 16 points e g 16 APSK 45 Msps 32 points e g 32 APSK 36 Msps 64 points e g 64 APSK 27 Msps Coefficient Update Rate Every 0 5 seco...

Страница 439: ...L 6 2 DPD and Adaptive Coding and Modulation ACM Local DPD can operate in constant coding and modulation CCM mode only because the modem uses the Rx port to receive predistortion feedback Because of t...

Страница 440: ......

Страница 441: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...

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