Comtech EF Data CDM-750 Installation And Operation Manual Download Page 266

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CDM-750 Advanced High-Speed Trunking Modem

Revision 2

Appendix D

MN-CDM750

D–10

D.4.4 Carrier-in-Carrier and Adaptive Coding and Modulation (ACM)

Appendix

ADAPTIVE

CODING

AND

MODULATION

(ACM)

OPTION

DoubleTalk

Carrier

‐

Carrier

fully

compatible

with

the

Adaptive

Coding

and

Modulation

(ACM)

mode

operation

the

CDM

‐

750.

CnC

combined

with

ACM

can

provide

100

–

200%

increase

average

throughput.

D.4.5 Carrier-in-Carrier Link Design

CnC

link

design

involves

finding

the

FEC

and

modulation

combination

that

provides

optimal

bandwidth

utilization.

Just

conventional

link

design,

iterative

process

that

involves

trying

different

FEC

and

modulation

combinations

with

CnC

until

optimal

combination

found.

For

optimal

CnC

performance,

recommended

that

the

two

carriers

have

similar

symbol

rate

and

power.

This

can

achieved

selecting

appropriate

ModCods,

shown

the

sections

that

this

chapter.

Normally,

CnC

link

results

saving

bandwidth

and

power,

there

are

satellite

resources

recovered

that

are

deployable

for

additional

links

and

more

throughput

over

the

existing

capacity.

When

sizing

the

link

transform

existing

carriers

into

CnC

links,

also

consider

how

the

recovered

capacity

best

deployed.

other

words,

evaluate

the

bandwidth

and

power

(or

power

equivalent

bandwidth)

tradeoffs

with

eye

the

future.

Summary of Contents for CDM-750

Page 1: ...anual For Firmware Version 1 6 1 or higher Part Number MN CDM750 Revision 2 IMPORTANT NOTE The information contained in this document supersedes all previously published information regarding this pro...

Page 3: ...vii Operating Environment xvii European Union Radio Equipment and Telecommunications Terminal Equipment R TTE Directive 1999 5 EC and EN 301 489 1 xvii European Union Electromagnetic Compatibility EMC...

Page 4: ...ng and Modulation ACM 1 14 1 4 8 DoubleTalkTM Carrier in Carrier CnC 1 15 1 4 9 Regulatory Compliance 1 15 1 4 10 Standard Assemblies 1 15 1 4 11 Optional Assemblies 1 16 CHAPTER 2 INSTALLATION 2 1 2...

Page 5: ...14 3 3 1 Chassis Ground Interface 3 14 3 3 2 115V 230V Alternating Current AC Power Interface Standard 3 15 3 3 2 1 AC Operation Applying Power 3 15 3 3 2 2 AC Operation Replacing Fuses 3 16 3 3 3 48...

Page 6: ...IG Rx EsNo 5 28 5 2 2 4 CONFIG Clocks 5 29 5 2 2 4 1 CONFIG Clocking Freq Ref 5 29 5 2 2 4 2 CONFIG Clocking Int Ref Adjust 5 29 5 2 2 5 CONFIG ACM Adaptive Coding and Modulation 5 30 5 2 2 5 1 CONFIG...

Page 7: ...6 Info ACM 5 54 5 2 5 7 Info CnC 5 54 5 2 5 8 Info Misc 5 54 5 2 5 9 Info Remote 5 55 5 2 5 10 Info Comp 5 55 5 2 6 SELECT Store Ld Store Load 5 56 5 2 7 SELECT Utility 5 57 5 2 7 1 Utility Set RTC 5...

Page 8: ...terface Menu Tree 6 9 6 5 4 Web Server Interface Page Descriptions 6 10 6 5 4 1 Home pages 6 10 6 5 4 1 1 Home Home 6 10 6 5 4 1 2 Home Contact and Home Support 6 11 6 5 4 2 Admin Administration pages...

Page 9: ...2 6 Optional Message Arguments 7 6 7 4 2 7 End of Packet 7 6 7 5 Remote Commands and Queries 7 7 7 5 1 Table Indexes 7 7 7 5 2 Tx Parameters 7 10 7 5 3 Rx Parameters 7 13 7 5 4 IP Packet Parameters 7...

Page 10: ...l Link Example C 4 C 3 ACM System Description C 6 C 4 CDM 750 ACM Scheme C 8 C 4 1 Target Es No Margin C 8 C 4 2 Distortion Adaptation Modulation Type Impairment C 9 C 4 3 Pilots C 10 C 4 4 Long and S...

Page 11: ...RP D 18 D 5 2 2 Calculating CnC Ratio from Carrier to Noise Ratio C N on a Spectrum Analyzer D 19 D 5 3 Calculating CnC Ratio and PSD Ratio from Satmaster D 20 D 6 DoubleTalk Carrier in Carrier Specif...

Page 12: ...6 Table 5 1 CDM 750 Front Panel Menu Matrix 5 5 Table 5 2 Symbol Rate Data Rate Range for Standard FECFrame DVB S2 Standard FECFrame 64 800 bits 5 25 Table C 1 ACM Example for Standard FECFrame 64 800...

Page 13: ...r Interface 3 15 Figure 3 8 Applying AC Power to the CDM 750 3 15 Figure 3 9 Replacing CDM 750 AC Fuses 3 16 Figure 3 10 CDM 750 DC Power Interface 3 17 Figure 3 11 Applying DC Power to the CDM 750 3...

Page 14: ...C 5 Spectral Efficiency vs Ideal Es No QEF C 12 Figure C 6 Spectral Efficiency vs Modem Es No QEF Pruned ModCods C 13 Figure C 7 CDM 750 Web Server Interface Configuration Modem page C 17 Figure C 8 C...

Page 15: ...ent TechnicalPublications comtechefdata com Conventions and References Patents and Trademarks See all of Comtech EF Data s Patents and Patents Pending at http patents comtechefdata com Comtech EF Data...

Page 16: ...2 displayed on the Web Server pages serial remote interface or unit rear panel All other references in the manual refer to EIA designations Metric Conversion Metric conversion information is provided...

Page 17: ...opean Union Radio Equipment 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 Direc...

Page 18: ...ield must be bonded to the back shell Operate the unit with its cover on at all times European Union Low Voltage Directive LVD 2006 95 EC Symbol Description HAR Type of power cord required for use in...

Page 19: ...arranty the owner is responsible for freight to Comtech EF Data and all related customs taxes tariffs insurance etc Comtech EF Data is responsible for the freight charges only for return of the equipm...

Page 20: ...ility to use them either separate from or in combination with any other equipment or products A fixed charge established for each product will be imposed for all equipment returned for warranty repair...

Page 21: ...normal business hours Monday through Friday 8 A M to 5 P M Mountain Standard Time MST For Contact CDM 750 Technical Support and Service Telephone 1 480 333 4357 Email cdmipsupport comtechefdata com Fa...

Page 22: ...he SUPPORT column at the bottom of the page select the RMA Request hyperlink OR On the Comtech EF Data Support page Click Send RMA Request OR On the Comtech EF Data Service page Select the Return Mate...

Page 23: ...ed satellite data links The CDM 750 architecture allows efficient networking and transport over satellite links while supporting a wide range of applications and network topologies Sect 1 3 CDM 750 Fe...

Page 24: ...nterface is converted for further processing Generic Steam Encapsulation GSE captures the Ethernet frames and prepares them for DVB S2 framing and modulation and coding Synchronous data interfaces are...

Page 25: ...anged to match those of the transmit side and an internal RF switch connects the modulator output to the demodulator input When normal operation is again selected all of the previous values are restor...

Page 26: ...ymbol rate Rx QPSK Demodulation Rx 8 PSK Demodulation Rx 16APSK Demodulation Rx 32APSK Demodulation Tx QPSK Modulation Tx 8 PSK Modulation Tx 16APSK Modulation Tx 32APSK Modulation Carrier in Carrier...

Page 27: ...ion Modulation QPSK 8PSK 16APSK 32APSK Coding DVB S2 LDPC BCH Dual IF 70 140 MHz 50 180 MHz L Band 950 2150 MHz and L Band Monitor standard Data Interfaces o 2 Gigabit 10 100 1000BaseT Interfaces stan...

Page 28: ...cy etc the DVB S2 Encapsulator Decapsulator or alternate framing deframing and the EIA 232 422 and Ethernet M C interfaces o The modem card performs all signal processing functions of modulation demod...

Page 29: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Introduction MN CDM750 1 7 1 3 2 Dimensional Envelope Figure 1 2 CDM 750 Dimensional Envelope...

Page 30: ...us of the modem 5 1 1 2 Keypad Enter data via the keypad The keypad comprises six individual keyswitches The keys have a positive click action that provides tactile feedback Data prompts and messages...

Page 31: ...r panel of the unit Figure 1 4 Top Standard AC Unit Bottom Optional 48V DC Unit FUTURE Figure 1 4 CDM 750 Rear Panel View 1 3 3 2 1 Rear Panel Standard Features The unit provides the following standar...

Page 32: ...S 1 Copper 155 52 Mbps o Additional PIIC data interface options ASI OC3 HSSI etc will become available upon request 1X DB 9M EIA 232 connector J2 REDUNDANCY port for interoperability with a separately...

Page 33: ...r 10 100 BaseT with SNMP Telnet HTTP Firmware Update Ethernet management port Frequency Stability Internal stability 0 06 ppm Form C Modulator demodulator and Unit fault Configuration Retention Non vo...

Page 34: ...to 180 MHz in 100 Hz steps maximum symbol rate is within IF limits 75 BNC Female Return Loss 18 dB 0 to 20 dBm 0 1 dB steps 70 140 MHz 0 5 dB of nominal at 25 C Within 0 5 dB from 25 C value at same f...

Page 35: ...sired Carrier 65 10log Symbol Rate in Msps dBm min and 25 dBm max See Fig 1 6 The lesser of 30 dBc 10log Symbol Rate in Msps or 10 dBm Acquisition Range 150 KHz 5 Msps 500 KHz 5 Msps Es No performance...

Page 36: ...asing Es No Corresponds to Es No plus impairments at QEF PER 10 7 Switch point hysteresis Configurable from 0 0 to 0 5 dB Max fading rate Configurable Target Es No margin from 0 0 to 4 5 dB Max ModCod...

Page 37: ...QPSK 0 3 dB 8 PSK 0 3 dB 16 APSK 0 6 dB 32 APSK 1 0 dB Monitor Functions Delay in milliseconds Frequency offset between outbound interferer and desired inbound 100 Hz resolution CnC ratio in dB ratio...

Page 38: ...is and rack rear mounting rails 2 2 1 KT 0000195 Rear Mounting Support Bracket 10 At rear sides of chassis and rack rear mounting rails 2 2 1 FP SL0006 Bearingless Side Railings On sides of chassis 2...

Page 39: ...he Shipment Figure 2 1 Unpacking and Inspecting the Shipment The CDM 750 Advanced High Speed Trunking Modem its Installation and Operation Manual and its power cord were packaged and shipped in a reus...

Page 40: ...Installation into a Rack Enclosure 2 2 Installing into a Rack Enclosure When mounting the CDM 750 into a rack enclosure Figure 2 2 PROPER GROUNDING PROTECTION IS REQUIRED The equipment must be connec...

Page 41: ...Front Panel 6 User supplied Screws Figure 2 2 Installing into a Rack Enclosure Mount the CDM 750 in its assigned position in the rack enclosure Use as required A standard rack mounted shelf User suppl...

Page 42: ...cket Kit 1 KT 6228 3 10 Rear Support Bracket Kit KT 6228 X Rear Support Bracket Kit Item Quantity CEFD Part Number Description KT 6228 2 KT 6228 3 A 2 2 HW 10 32SHLDR Screw 10 Shoulder B 4 4 HW 10 32F...

Page 43: ...escription 1 Assemble the Adapter Plates to the back side of the CDM 750 chassis using the 10 Flat Head Screws 2 Assemble the 10 Shoulder Screws through the Adapter Plate mounting slots using the 10 F...

Page 44: ...750 chassis 2 Use the provided mounting hardware to install the slide rail components into each interior side of the rack enclosure 3 Mount the unit into the front of the rack enclosure Ensure that t...

Page 45: ...l of these operational interface types may be available with this product 3 1 1 Coaxial Cable Connections Coupling Type Connector Type Plug Jack Bayonet Type BNC shown Threaded Type N shown Figure 3 1...

Page 46: ...ation Connection Instructions Bayonet Coupling Connections Use the plug slots to guide then slide the plug onto the jack posts Then turn the plug clockwise until the jack posts are fully seated within...

Page 47: ...e 3 2 D Subminiature Connector Examples D Subminiature connectors are also called Type D or D Sub connectors The connector pair features multiple rows of pins male side coupled to mating sockets femal...

Page 48: ...n the male connector on the interconnection cable and female socket e g the ODM R 840 CONSOLE REDUNDANCY port or the POWER port To install the male connector into the female connector 1 Engage the pri...

Page 49: ...nnections Top Standard AC Unit Bottom Optional 48V DC Unit FUTURE Figure 3 3 CDM 750 Cabling Connections The CDM 750 rear panel connectors Figure 3 3 provide all necessary external connections between...

Page 50: ...ce EIA 485 232 J4 MGMT RJ 45 female 10 100 BaseT M C J8 EXT REF BNC female External Reference Input Output Terrestrial Data Sect 3 2 3 J5 DATA RJ 45 female 10 100 1000 BaseT Gigabit Ethernet traffic J...

Page 51: ...signal 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 Type N J12 L BAND TX OUT connector features an LED labeled BUC PWR ON When a Block U...

Page 52: ...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...

Page 53: ...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 Sign...

Page 54: ...C The female BNC J8 EXT REF External Reference 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 selected...

Page 55: ...of the data link traffic The RJ 45 female J5 DATA and J6 DATA connections are auto sensing auto crossover ports used for 10 100 1000 BaseT Gigabit Ethernet data traffic Each port features two LEDs tha...

Page 56: ...module an industry standard SFP Small Form Factor Pluggable interface 3 2 3 2 1 Optional Optical Gigabit Ethernet Interface CEFD P N IC 0000058 Figure 3 4 Typical SFP Module Installation The optional...

Page 57: ...B 2 1 KT 0000255 SFP STM 1 Copper BNC PIIC Module B 2 2 KT 0000256 SFP OC 3 Single Mode PIIC Module B 2 3 KT 0000257 SFP OC 3 Multi Mode PIIC Module Additional PIIC module data options ASI HSSI etc w...

Page 58: ...rth connection at all times It is therefore imperative that the unit is properly grounded using the ground stud provided on the unit rear panel during installation configuration and operation Top Stan...

Page 59: ...and 48 volt BUC 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 neutral fusing 2X...

Page 60: ...e rear panel Figure 3 9 Figure 3 9 Replacing CDM 750 AC Fuses To replace the fuse s follow these steps Figure 3 9 DISCONNECT THE POWER SUPPLY BEFORE PROCEEDING First unseat the fuse holder from the IE...

Page 61: ...Terminal Block 3 Screw in Fuse Holders Receptacles DC Power Specifications Input Power 48 watts typical with TPC LDPC Codec and CnC module installed 68 watts max 280 watts typical TPC LDPC Codec CnC m...

Page 62: ...Figure 3 11 Applying DC Power to the CDM 750 To apply DC power to the CDM 750 follow these steps Figure 3 11 First connect the user supplied and DC power leads to their respective terminals Number 18...

Page 63: ...cing CDM 750 DC Fuses To replace the fuses follow these steps Figure 3 12 DISCONNECT THE POWER SUPPLY BEFORE PROCEEDING First unscrew either fuse holder from its receptacle Then remove and replace the...

Page 64: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Rear Panel Connections MN CDM750 3 20 Notes...

Page 65: ...perating firmware If a firmware update is needed it can be acquired by download from the Comtech EF Data Web site www comtechefdata com or from Comtech EF Data Customer Support during normal business...

Page 66: ...the 9 pin serial cable to connect the CDM 750 rear panel J3 REMOTE port to a serial port on the user PC B On the PC Open the terminal emulator program Refer to your terminal emulator program HELP fea...

Page 67: ...First use an Ethernet hub switch or direct cable connection to connect the CDM 750 rear panel J4 MGMT 10 100 Fast Ethernet port to an Ethernet port on the user PC o Then use a Web browser e g Internet...

Page 68: ...ry folder Select File New Folder to create the temporary folder The new folder will be created in the active folder Right click the New Folder folder name and then rename this folder to temp or some o...

Page 69: ...S DOS Prompt icon from the Main Menu Next open a Command line window o For Windows 95 or Windows 98 type command o For any Windows OS versions later than Windows 98 type cmd or command o Alternately f...

Page 70: ...e specific model and optional hardware configurations The CDM 750 firmware download hyperlink appears as F0000305X_V where X denotes the revision letter and represents the firmware version e g V123 Ve...

Page 71: ...e archive file name and then follow the prompts provided by the user supplied utility program Extract at a minimum two files FW0000305x bin the Firmware Bulk image file where x denotes the revision le...

Page 72: ...identified using the Front Panel the Remote Interface or the CDM 750 Web Server Interface Status Firmware page The latest firmware files have been downloaded or otherwise received from Comtech EF Data...

Page 73: ...g 2 Use Command line to transfer FTP the files from the user PC to the CDM 750 Type ftp xxx xxx xxx xxx where xxx xxx xxx xxx denotes the unit Management IP Address Enter the username and password ass...

Page 74: ...e power now to boot from the selected image Use the rear panel ON OFF switch to cycle the power as prompted Be sure to note the firmware version that displays on the front panel splash screen upon suc...

Page 75: ...o Click Submit to save this boot setting o Click Reboot Modem to reboot the CDM 750 from the Firmware Image Config section of the Configuration Utilities page Wait while the CDM 750 reboots The CDM 75...

Page 76: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Updating Firmware MN CDM750 4 12 Notes...

Page 77: ...ys have a positive click action that provides tactile feedback Data prompts and messages are displayed on the VFD 5 1 2 3 Vacuum Fluorescent Display VFD The VFD is an active display with adjustable br...

Page 78: ...firmware are faulted Rx TRAFFIC Green Tx Traffic is passing normally demod and decoder are locked everything is OK Off An Rx Traffic fault exists the demod may still be OK NOTE By convention demodulat...

Page 79: ...configuration change From the opening screen press ENTER once to display the SELECT Main menu CLEAR back out of a selection or to cancel a configuration change that has not been executed using ENTER...

Page 80: ...once per second rate This indicates the currently selected item digit or field Where this solid block cursor would obscure the item being edited e g a numeric field the cursor will automatically chang...

Page 81: ...r Live Alarms Stored Events ACM Rx Params CnC Stats Buffer Use to monitor the current status of the modem and view the log of stored events for the modem Info 5 2 5 Information Info ID Intf Tx Rx Cloc...

Page 82: ...5 2 2 2 Transmit Use to define on a parameter by parameter basis the Tx configuration of the unit Rx 5 2 2 3 Receive Use to define on a parameter by parameter basis the Rx configuration of the unit C...

Page 83: ...up The port speed is 10 Base T with Half Duplex communications 10 F The GbE interface is On The PHY is up The port speed is 10 Base T with Full Duplex communications 100 H The GbE interface is On The...

Page 84: ...re of the GbE interfaces MUST be active in order to enter or exit from MultiStream Mode Therefore at least one of the GbE interfaces must be active at the same time that at least one of the PIIC slots...

Page 85: ...al Tx data rate that the modem can accommodate This Tx data rate must be able to support the aggregate interface type services you plan to transmit 5 Return to the CONFIG Intf menu to enable one or bo...

Page 86: ...the optional G 703 interface as being installed in Plug In Interface Card slot 1 PIIC1 or slot 2 PIIC2 Use the W X arrow keys to select IntfType ClkSource RxBuffer or Mask and then press ENTER Typica...

Page 87: ...elect 1 MHz 2 MHz 5 MHz 10 MHz 20 MHz 34 368 MHz E3 44 736 MHz T3 or 51 840 MHz STS1 and then press ENTER CONFIG INTF PIICX G 703 ClkSource TxClock Tx Clock Source TX CLK To lock the Tx symbol rate of...

Page 88: ...75 ms in 0 5 ms steps and then press ENTER CONFIG INTF PIICX G 703 RxBuffer Recenter Rx Buffer ReCenter In the event of data underflow or overflow as indicated by the Fill Status percentage reported o...

Page 89: ...ck rate are different Using the TxPLL menu as the example Tx Pll Mask Fault Alarm Fault Mask Fault Tx On The top line notes the active mask selection On the bottom line use the W X arrow keys to selec...

Page 90: ...pper module and accompanying SFP are installed into the PIIC slot The second indication displays the operational state of the SFP this display example confirms that while the module SFP is plugged in...

Page 91: ...Rx Clock setting and a data underflow is occurring If the RxBuffer Fill Status is increasing approaching 100 the Rx traffic is coming in faster than the Rx Clock setting accommodates and a data overfl...

Page 92: ...ault Mask Fault Tx On The top line notes the active mask selection On the bottom line use the W X arrow keys to select Alarm Fault Mask or Fault Tx On for the TxPll and InpSigLoss menus or Alarm Fault...

Page 93: ...Duplex Press ENTER when done Note the following External Equipment Capability External Equipment Port Setting Correct Port Configuration Selection on CDM750 10 Base T 10 100 1000 Base T Auto Auto 10...

Page 94: ...then press ENTER Note the following With MAC Learning set as Disabled the modem passes any traffic entering from the GBEI LAN interface to the satellite WAN side of the link while traffic coming in f...

Page 95: ...modem s Content Addressable Memory CAM table for a period of five 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...

Page 96: ...IF Tx Carrier On Off On SpectrumInvert Off Tx 35 35 25 v First use the W X arrow keys to select Tx Carrier Spectrum Invert or Tx On the top line use the ST arrow keys to set the Tx Carrier as On or Of...

Page 97: ...ER when done 5 2 2 2 4 CONFIG Tx Frame Tx Framing Normal DVB S2 Framing Mode v Use the ST arrow keys to select Normal or Short Block and then press ENTER Note the following With the default value of N...

Page 98: ...ENTER CONFIG Tx Data Tx Data Rate To configure the Tx Data Rate of the modem the modem must be in Single Stream Mode with only the Ethernet interfaces active You can tell when the modem is in Single...

Page 99: ...ate range from 1 Msps to 63 Msps See Table 5 2 for available modulation and code rate combinations Note that in this table in the Data Rate Range columns there is some roundoff of the last digit The a...

Page 100: ...continue Pilot Location is read only and fixed at Average When Pilots are enabled i e Pilot On they will always be located at the average power point of any constellation CONFIG Tx Pilot Pilot Use th...

Page 101: ...682548 1 746049 1 746049 110 001082 12 8PSK 3 5 1 63 1 779991 1 779991 112 139419 1 739569 1 739569 109 592863 13 2 3 1 980636 1 980636 124 780083 1 935658 1 935658 121 946472 14 3 4 2 228124 2 228124...

Page 102: ...ion status on the top line The bottom line identifies the active RxA Rx Rolloff value Press ENTER or CLEAR to return to the previous menu 5 2 2 3 2 CONFIG Rx Freq Frequency Rx IF Frequency 0050 0000 M...

Page 103: ...Rx Data Rate you need to make changes as necessary to the Rx Symbol Rate Gold n Index Code Goldcode and Rx IF Frequency of the modem Press ENTER or CLEAR to return to the previous menu CONFIG Rx Data...

Page 104: ...EAR to return to the previous menu 5 2 2 3 7 CONFIG Rx EsNo Receive EsNo Alarm Point 02 0 dB v To edit the EsNo Alarm Point First use the W X arrow keys to select a digit to edit and then use the ST a...

Page 105: ...quency reference for both the modem and another piece of equipment in the system When selecting this mode a green LED adjacent to the connector illuminates to alert the user that the connector normall...

Page 106: ...range of ModCods over which the system will operate i e the range for the modem s Tx capability First use the W X arrow keys to select the Min or Max ModCod Then use the ST arrow keys to select the av...

Page 107: ...just after sending an ACM message There could be 250 ms of delay before the next message The message will take 290 ms to traverse across the satellite link There will be some minimal processing time...

Page 108: ...or that setting factory default for all settings is 0 0 Press ENTER when done Degradation figures can be used to further ensure that switching to higher order Modulation will not cause errors as may b...

Page 109: ...ff and this submenu is inoperable 5 2 2 6 2 CONFIG Carrier in Carrier Search Delay CnC Search Delay range 0 300ms Min 010 ms Max 290 ms 34v To reduce the time taken for the CnC algorithm to converge y...

Page 110: ...k Type Description Alarm Alarms can be viewed from the Monitor Live Alarms menu Sect 5 2 4 1 Alarms cause the Unit Status LED to turn AMBER Fault Faults can be viewed in the Monitor Stored Events log...

Page 111: ...ing Serial Ethernet allows all methods of remote access to the modem 5 2 2 8 1 CONFIG Remote Control Serial or Ser Ethernet Interface RS 485 2W 232 485 2 485 4 Address 0001 38400 baud v Note Character...

Page 112: ...n if Inband control is enabled a physical jumper connection should never be connected from any data IP interface port to the physical management port as this will cause a networking loop and create a...

Page 113: ...ernet IP Gateway 192 168 001 002 v The Gateway Address is the default next hop address used by the M C to send traffic to when the M C is sending a datagram to an IP address outside of its subnet mask...

Page 114: ...characters on the bottom line are available All printable ASCII characters are available with the exception of the backslash ASCII code 92 and tilde ASCII code 126 Press ENTER once you compose this s...

Page 115: ...le All printable ASCII characters are available with the exception of the backslash ASCII code 92 and tilde ASCII code 126 Press ENTER once you compose this string All trailing spaces are removed from...

Page 116: ...outed through the compression card and will be compressed Tx Compression LAN to Satellite requires activation of a software license or FAST Access Code Tx compression rate licenses are sold by the sym...

Page 117: ...framing or terrestrial data patterns 2IF IF Loopback This mode invokes an internal IF loop It is a particularly useful test in that it permits the user to perform a quick diagnostic test without havi...

Page 118: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Front Panel Operation MN CDM750 5 42 Figure 5 3 Loopback Test Modes...

Page 119: ...er setting Note the following Feature Selection BERT Tx Off On BERT Pattern 2047 2 15 1 215 1 2 23 1 223 1 5 2 3 2 2 TEST BERT Monitor BERT Tx must selected as ON in order to monitor BERT testing as t...

Page 120: ...modem Appendix A FAST OPTIONS AND ACTIVATION PROCEDURE Bypass Enable v Use the STarrow keys to select Enable or Disable and then press ENTER Note the following With Enable selected K4 GZip compressio...

Page 121: ...8V 1 9V 2 5V 1 25V MdmBdPs X X Modem Board Power Supply Fault 5 5V 3 8V 2 3V 3 3V 1 8V 1 2V Pwr Cal Transmit power is not factory calibrated Contact factory FPGA Load An FPGA could not be configured R...

Page 122: ...Press ENTER or CLEAR to return to the previous menu or to flush the event log buffer use the W X arrow keys to select Clear All Then use the arrow keys to select Yes or No When Yes is selected Clear...

Page 123: ...he signal level of the desired receive carrier Resolution 0 5dB ModCod The current ModCod 5 2 4 5 Monitor CnC Carrier in Carrier Parameters CnC Params Freq offset 123 4kHz Ratio 1dB Delay 230 4ms When...

Page 124: ...lected port IPstats Port Selection top line Statistic bottom line Description GbE 1 GbE 2 WAN M C Opt X X X Packets from LAN Number of acceptable Ethernet Packets received on selected port from the LA...

Page 125: ...t QPSK 5 6 Rx Count QPSK 5 6 RxErrFrms QPSK 5 6 Tx Count QPSK 8 9 Rx Count QPSK 8 9 RxErrFrms QPSK 8 9 Tx Count QPSK 9 10 Rx Count QPSK 9 10 RxErrFrms QPSK 9 10 Tx Count 8PSK 3 5 Rx Count 8PSK 3 5 RxE...

Page 126: ...ection is read only Bytes In 0 0E 00 Savings 00 34v Bytes Out 0 0E 00 Last 10s 00 CLR N Select LanToWan to view the Tx compression statistics of the modulator s transmission path Bytes In X XE XX valu...

Page 127: ...Then either press ENTER to wipe the buffer or press CLEAR to back out of the command and return to the previous menu 5 2 4 7 Monitor Buffer WAN Buffer Fill Status 100 This read only screen indicates t...

Page 128: ...ID_TEST_MESSAGE This screen displays the user defined Circuit ID string 24 characters maximum created previously using the Utility Circuit ID submenu 5 2 5 2 Info Intf Chapter 3 REAR PANEL CONNECTORS...

Page 129: ...aming Framing Type NOR Normal SB Short Block Tx Data Rate xxxxx xxx kbps an asterisk indicates that the data sense is inverted Modulation QPSK 8PSK 16APSK 32APSK FEC Rate Displays the FEC rate 5 2 5 4...

Page 130: ...ed 5 2 5 7 Info CnC CnC Status Freq offset 000 0kHz Ratio 11 dB Delay 000000us This screen shows the current CnC operating parameters when enabled 5 2 5 8 Info Misc 1 1 Redundancy Status Online 1 1 Sw...

Page 131: ...000 Interface RS 232 9600 baud This screen shows whether the unit is in Local or Remote Mode and identifies the selected electrical interface type the unit s address and the baud rate 5 2 5 10 Info Co...

Page 132: ...an existing configuration Once you select a location use the W X arrow keys to Load or Store the configuration and then press ENTER When a modem configuration is stored to a location the modem logs t...

Page 133: ...n done In accordance with European convention the date is shown in DAY MONTH YEAR format Time is shown in Military 24 hour format 5 2 7 2 Utility Display Brightness Edit Display Brightness 100 v To ed...

Page 134: ...specified here The conditional states for forced switchover are identified on this screen as follows 1 1 redundancy is Not Connected This message indicates that the modem s rear panel J2 REDUNDANCY c...

Page 135: ...THERWISE DIRECTED BY COMTECH EF DATA CUSTOMER SUPPORT These submenus permit you to view information about the CDM 750 internal firmware The modem can store two complete firmware images You can select...

Page 136: ...ress ENTER 5 2 8 1 ODU LNB PwrSupply Ref LNB control monitor PSU and 10MHz PSUmonitor 34 Use the W X arrow keys to select PSU and 10MHz or PSUmonitor and then press ENTER 5 2 8 1 1 ODU LNB PwrSupply R...

Page 137: ...ur low and high alarm limit values On the bottom line first use the W X arrow keys to select a digit to edit and then use the ST arrow keys to change that digit Press ENTER when done 5 2 8 1 2 ODU LNB...

Page 138: ...ized under three internal EEPROM registers Each register requires a unique FAST Access Code It is important during upgrade to use the register specific FAST Access Code with the appropriate register U...

Page 139: ...repeating the procedure contact Comtech EF Data Customer Support for further assistance 5 2 9 1 2 FAST FAST Options View FAST View options1 01 installed 63 Msps Rx symbol rate v Use the ST arrow keys...

Page 140: ...splays a message that no CnC license is installed and provides time remaining and time remaining refill timers or that a Full CnC license is installed and the screen displays no timers Note the follow...

Page 141: ...normative mode of operation To best inform you that your modem is running Fractional CnC i e the FractionalCnC Time Remaining counter is actively decrementing your modem does the following The RED Un...

Page 142: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Front Panel Operation MN CDM750 5 66 Notes...

Page 143: ...ar panel J3 REMOTE port with a user supplied serial cable o The PC Ethernet port is connected to the CDM 750 rear panel J4 MGMT 10 100 BaseT Ethernet port with a user supplied hub switch or direct Eth...

Page 144: ...via Windows Command line or a user supplied terminal emulation program such as HyperTerminal installed on the user PC CDM 750 Web Server HTTP Interface This non secure interface requires a compatible...

Page 145: ...e ComtechEFData FW 0000083L mib CDM 750 MIB file MIB file consists of all of the OIDs for management of the modem functions FW 0000084 mib CDM 750 Traps MIB file Trap MIB file is provided for SNMPv1 t...

Page 146: ...SNMPTrapVersion OID The CDM 750 supports the following MIB2 SNMPv1traps SNMPv2 notifications MIB2 SNMPv1 trap Authentication Failure 5 MIB2 SNMPv2 notifications Authentication Failure 1 3 6 1 6 3 1 1...

Page 147: ...as a Telnet client Since Command line cannot translate a r i e carriage return or CR to a r n i e CR line feed LF for the messages coming from Telnet Server any multi line Target to Controller respon...

Page 148: ...anced High Speed Trunking Modem Revision 2 Ethernet based Remote Product Management MN CDM750 6 6 Examples of login and remote command query execution when using HyperTerminal as the interface appear...

Page 149: ...ss area of the user PC Web browser Once the valid IP address is entered Before any further access to the pages can granted the user is prompted for a user Name and Password via the Login Window simila...

Page 150: ...ft corner of each page or page section provides indicates its operational features Each section can feature editable fields action buttons and read only displays that are specific to that section This...

Page 151: ...o to another page without first clicking the action button your changes are not saved 6 5 3 Web Server Interface Menu Tree Any diagram block that is marked with denotes a page that is functional only...

Page 152: ...s e g LNBs or BUCs PIICs etc installed and configured for use with the CDM 750 Such operational restrictions will be noted in the subsections that follow through the end of this chapter 6 5 4 1 Home p...

Page 153: ...based Remote Product Management MN CDM750 6 11 6 5 4 1 2 Home Contact and Home Support Use either page to see the contact information phone fax or Web e mail hyperlinks for Comtech EF Data Sales or C...

Page 154: ...to continue 6 5 4 2 1 Admin Access The Administrator must use this page to manage the CDM 750 Web Server Interface user access settings Figure 6 3 Admin Access page System Account Access Information...

Page 155: ...to grant access to a PC with an IP Address of 10 10 10 1 and any PC on a subnet of 192 168 10 xxx then the Access List would be defined as IP 1 Mask 10 10 10 1 32 IP 2 Mask 192 168 10 0 24 For IP 3 Ma...

Page 156: ...s public Enter a Write Community string This string 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 Con...

Page 157: ...r parameters and should be configured before setting other parameters See Chapter 5 FRONT PANEL OPERATION for details pertaining to configuration parameters available on this page Web Page Section Cha...

Page 158: ...band 1 1 Redundancy Control 5 2 7 4 Utility 1 1 1 N Redundancy Control 5 2 7 5 Utility 1 N Firmware Image Config 5 2 7 7 Utility Firmware Save Load 5 2 6 SELECT Store Ld Store Load Figure 6 6 Configur...

Page 159: ...r 5 FRONT PANEL OPERATION for details pertaining to configuration parameters available on this page Web Page Section Chapter 5 Section Reference Unit 5 2 3 1 TEST Mode BERT Config 5 2 3 2 1 TEST BERT...

Page 160: ...rating range for each item in this section is provided in parentheses LNB DC Power Use the drop down list to select the power as OFF 13V 18V or 24V LNB Reference Enable Use the drop down list to set L...

Page 161: ...ick the Status navigation tab and then select the Status Logs Info Firmware ACM IP Statistics or BB Statistics page tab to continue 6 5 4 4 1 Status Status Use this read only page to review and monito...

Page 162: ...order of occurrence in blocks of five Note the following Read Next Five Events Select to buffer the next group of five stored events into the scrollable Events window Clear Events Log Select to purge...

Page 163: ...cally 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 insta...

Page 164: ...irmware Use this read only page to review status windows pertaining to the unit s operational firmware loads The scrollable Boot section provides information about the currently loaded Bootrom The scr...

Page 165: ...gement MN CDM750 6 23 6 5 4 4 5 Status ACM Sect 5 2 2 5 CONFIG ACM Adaptive Coding and Modulation in Chapter 5 FRONT PANEL OPERATION Appendix C ADAPTIVE CODING AND MODULATION ACM OPTION Use this scrol...

Page 166: ...6 DATA Monitor and Control J4 MGMT ports and the optional Optical J7 OPTICAL port located on the CDM 750 rear panel This page also provides statistics pertaining to the WAN interface and the optional...

Page 167: ...7 Status BB Statistics Sect 5 2 4 6 2 Monitor Stats BaseBandFraming in Chapter 5 FRONT PANEL OPERATION Use this scrollable read only page to view Modem Baseband operating statistics Figure 6 15 Status...

Page 168: ...faces pages provide you with the means to configure and monitor the available standard and optional Ethernet and traffic data interfaces These pages refer to the connectors and optional data interface...

Page 169: ...ect Flow Control or Learning as Enabled or Disabled Click Submit to save these settings GBEI Interfaces Disable PIIC Interfaces Before Configuring Ethernet Ports Sect 5 2 2 1 1 Single Stream Mode vs M...

Page 170: ...ard Use this page to configure the optional G 703 E3 T3 STS 1 OC 3 Single Multi Mode and STM 1 Copper PIIC modules if installed in PIIC slots 1 and or 2 Figure 6 17 Interfaces page Typical for the Slo...

Page 171: ...quires all devices to be locked to the External Clock Rx Clock Source Use the drop down list to select Tx Clock Int Clk or Rx Sat Comtech EF Data strongly recommends that you select Rx Sat unless a hi...

Page 172: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Ethernet based Remote Product Management MN CDM750 6 30 6 5 4 6 TxGraph pages Minutes Hours Days Figure 6 18 TxGraph pages TxHours page shown...

Page 173: ...rcent Compression Comp This graph represents the LAN to WAN compression statistic as described in Sect 5 2 2 3 6 3 Monitor Stats Compression LanToWan Tx Percent Compression is calculated using the fol...

Page 174: ...s to switch up or down Note that the Remote Es No is the reported Es No of the far end modem as seen by the local modem This reported Remote Es No data can be 250ms to 400ms old as this is the amount...

Page 175: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Ethernet based Remote Product Management MN CDM750 6 33 6 5 4 7 RxGraph pages Minutes Hours Days Figure 6 19 RxGraph pages RxHours page shown...

Page 176: ...h page is identical Note the following Rx Percent Decompression DeComp This graph represents the WAN to LAN decompression statistic as described in Sect 5 2 2 3 6 3 Monitor Stats Compression WanToLan...

Page 177: ...f Local Es No red The Local Es No is the Es No of the local modem When more than one ModCod is received in the smallest interval period allowable by the graph the most common ModCod received in that t...

Page 178: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Ethernet based Remote Product Management MN CDM750 6 36 Notes...

Page 179: ...cted to the CDM 750 rear panel REMOTE port using a user supplied serial cable o The PC Ethernet port is connected to the CDM 750 rear panel J4 MGMT 10 100 BaseT Ethernet port with a user supplied hub...

Page 180: ...eparate isolated independent differential mode twisted pairs each handling serial data in different directions It is assumed that a Controller device a PC or dumb terminal transmits data in a broadcas...

Page 181: ...vice that is permitted to initiate at will the transmission of data Targets are only permitted to transmit when they have been specifically instructed to do so by the Controller All messages from Cont...

Page 182: ...aracters ASCII code 47 1 character 3 characters or ASCII codes 61 or 63 1 character n characters Carriage Return ASCII code 13 1 character Packet Example 0000 TMC cr lf Detailed description of the pac...

Page 183: ...ction Code that precedes it is to be used as a command to assign or configure operation The instruction set that follows serves to assign the Target s new parameter setting or operational value For ex...

Page 184: ...h for example TFQ with message arguments ASCII code 35 If the Controller sends a correctly formatted command BUT the unit is not in Remote Mode it does not allow reconfiguration and responds for examp...

Page 185: ...ss through messageto a local ODU Message ok but unit is in Ethernet mode Sect 7 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 7 11 TFQ X X 7 10 TMC X...

Page 186: ...X 7 20 SSC X X 7 23 TIM X X 7 18 EFR X X 7 19 LC1 X X 7 22 SSL X X 7 24 TST X X 7 19 Sect 7 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 7 26 ESN X...

Page 187: ...WR X 7 33 Sect 7 5 11 Modem Performance Information CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE CODE C Q PAGE BKE X 7 40 CDM X 7 39 RBP X X 7 40 ST2 X 7 41 TBP X X 7 40 BRA X 7 40 CFM X 7...

Page 188: ...S2 Normal 1 DVB S2 Short Block Example TFM 1 selects DVB S2 Short Block mode TFM TFM TFM TFM TFM TFM x see Description of Arguments Tx MODCOD TMC 2 bytes value of 1 to 36 Command or Query Set or retur...

Page 189: ...xxxxx xxx NOTE If the Data Rate is set then the Symbol Rate will be automatically calculated and updated The symbol rate will be limit checked to assure valid ranges The Data Rate can only be changed...

Page 190: ...te is below 5000 Ksps TPI TPI TPI TPI TPI TPI x Tx Pilot Location N A 1 byte value of 0 Query only Returns Tx Pilot location in the form 0 where 0 Average Power Example TLP 0 which returns Average Pow...

Page 191: ...m xx where N A RMC RMC xx see Description of Arguments 0 reserved 1 reserved QPSK 2 reserved QPSK 1 3 3 reserved QPSK 2 5 4 QPSK 1 2 5 QPSK 3 5 6 QPSK 2 3 7 QPSK 8 QPSK 4 5 9 QPSK 5 6 10 QPSK 8 9 11 Q...

Page 192: ...rn Rx Gold Code Sequence Index in the form xxxxxx where Gold Code Sequence index 000000 to 262141 Example RGS 189063 RGS RGS RGS RGS RGS RGS xxxxxx Rx Pilot N A 1 byte value of 0 or 1 Query only Retur...

Page 193: ...d Query Instruction Qualifier Response to Query Ethernet Data Rate Multi Stream Mode N A 10 bytes Query only Applies to MultiStream Mode Returns the Ethernet data rate of the modem in the form xxxxxx...

Page 194: ...sion efficiency xx 00 99 The last 10 seconds percent savings or compression efficiency Each parameter is separated by a colon Example CSA 2 0E 03 1 0E 03 50 50 NOTE If the Compression Option Card is n...

Page 195: ...00 WBL WBL WBL WBL WBL WBL xxx see Description of Arguments IP Statistics N A 143 bytes Query only Returns all IP Statistics Return format for each parameter is x xE xx with each parameter separated b...

Page 196: ...SBS SBS SBS SBS SBS SBS x see Description of Arguments Current Software Image N A 1 byte value of 0 or 1 Query only Return the active software image in the form x where 0 Bulk Image 1 currently activ...

Page 197: ...ED indicates when ON Example EFR 1 selects External 1MHz EFR EFR EFR EFR EFR EFR x see Description of Arguments Adjustment for the Internal 10MHz High stability Reference ADJ 4 bytes numeric Command o...

Page 198: ...ditions in form nopqrs where n Rx Buf PLL Alarm o Rx Buf OverFlow Alarm p rx Buf UnderFlow Alarm q Ext Clk Act Alarm r Ext Clk In Range Alarm s input signal loss Alarm t Tx Symbol Clock PLL Alarm xxx...

Page 199: ...ddmmyy date stamp hhmmss time stamp If there are less than five events to be retrieved the remaining positions are padded with zeros If there are no new events the response is RNE N A RNE RNE CR ABCCd...

Page 200: ...ce mode in the form x where 0 Auto Negotiate default 1 1000Mbps Full Duplex 2 100Mbps Full Duplex 3 100Mbps Half Duplex 4 10Mbps Full Duplex 5 10Mbps Half Duplex 6 Off LC1 LC1 LC1 LC1 LC1 LC1 x see De...

Page 201: ...ing Empty string is not allowed Example 1 SWC private SWC SWC SWC SWC x see description of arguments SNMP Trap Destination IP Address 1 STA 15 bytes Numerical Command or Query Set or return the IP add...

Page 202: ...FRB None Command only Force unit to perform a reboot NOTE LRS must be set to Serial Remote LRS 1 or Ethernet plus Serial LRS 4 before executing this command Example FRB force reboot FRB FRB FRB N A N...

Page 203: ...escription of Arguments Response to Command Query Instruction Qualifier Response to Query CnC Min Max Search Delay CSD 6 bytes Command or Query CnC parameter Set or return CnC min max delay value in m...

Page 204: ...9 ss 16APSK degradation in dB from 0 0 to 9 9 tt 32APSK degradation in dB from 0 0 to 9 9 Example ADC 03050717 Sets QPSK degradation to 0 3 dB 8PSK degradation to 0 5 dB 16APSK degradation to 0 7 dB...

Page 205: ...ts Tx Interface Clock source TCK 2 bytes Command or Query Set or return Tx Clock Source For Data Rate Accuracy where s Defines which Interface Slot 1 or 2 x Rx Clock Source where 0 Tx Clock 1 External...

Page 206: ...set the modem data rate to 155 52 Mbps The unit will adjust 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...

Page 207: ...Query Set or return Rx Buffer Size in ms in the form sxxx x where s Interface Slot where 1 Slot 1 2 Slot 2 xxx x Rx Buffer Size in 0 5 ms steps from 2 0 to 75 0 ms Example RBS 1032 5 selects 32 5 ms...

Page 208: ...lpha Rolloff GGGGGG Tx Gold Code T Tx Pilot L Tx Pilot Location sPP 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 In...

Page 209: ...UUUUUUUUU 3 If an interface is detected but the interface type is set to NONE then the following bits will be returned 20xxxxxxxxxxxxxxxxxx where 2 means G 703 interface detected 0 means NONE selected...

Page 210: ...the form x where 0 OFF 1 13V LNB Voltage 2 18V LNB Voltage 3 24V LNB Voltage LPS LPS LPS LPS LPS LPS x see Description of Arguments LNB Low Current Limit LNL 3 byte Command or Query Set or return Low...

Page 211: ...e of the internal software revision installed in the unit in the form of xx xx xx Example SWR SWR Boot 1 0 3 Bulk1 1 1 2 Bulk2 1 4 3 N A SWR SWR xx xx xx see description of arguments Firmware informat...

Page 212: ...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 Reserved Transec 0 not present 1 present F CnC 0 no...

Page 213: ...20 None 1 5M 2 15M 3 34M 4 47M 5 63M P Tx Modulation Bitwise Representation 3 Q Rx Modulation Bitwise Representation 3 30x00 None 0x08 QPSK 0x04 8PSK 0x02 16APSK 0x01 32APSK R Modulator 0 not installe...

Page 214: ...y period expiers the fractional timer will automatically reset to 90 days N A FCC FCC DD HH MM SS see Description of Arguments Time remaining in 365 day period N A 12 bytes Query only Returns the time...

Page 215: ...and 90 returns RSL EQ XX EQ equal to If in the range of 20 to 90dBm returns RSL YY xx Example RSL EQ 45 indicating 45 dBm N A RSL RSL xxxxx see description of arguments Rx Frequency Offset N A 6 bytes...

Page 216: ...oard Power Supply 1 25V 08 Modem Board Power Supply 5 5V 09 Modem Board Power Supply 3 8V 10 Modem Board Power Supply 2 3V 11 Modem Board Power Supply 3 3V 12 Modem Board Power Supply 1 8V 13 Modem Bo...

Page 217: ...m is locked it monitors the ratio between the interferer and the desired power Ratio is returned in dB in the form xxxx Example 1 CRM 02 interferer desired format sdd Example 2 CRM LT11 less than 11 d...

Page 218: ...erved 5 2047 6 2 15 1 Example TBP 0 default 2 23 1 TBP TBP TBP TBP TBP TBP see Description of Arguments BERT Error Insert BKE None Command only Inserts a single error BKE BKE BKE N A N A BERT Clear BE...

Page 219: ...mes per Modcod N A Query only Return format for each modcod entry is x xE xx with each entry separated by a colon There are 25 total entries beginning with modcod 4 QPSK 1 2 and ending with modcod 28...

Page 220: ...t 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 Mode for this command to function 3 If th...

Page 221: ...service requirements change you can upgrade the topology of the unit to meet these requirements within minutes This accelerated upgrade can be accomplished because of FAST s extensive use of the progr...

Page 222: ...detailed information about using the CDM 750 Front Panel FAST menus or Chapter 6 ETHERNET BASED REMOTE PRODUCT MANAGEMENT for detailed information about using the CDM 750 Web Server interface Step Tas...

Page 223: ...ures Provide the modem s 9 digit Baseboard Serial Number to the representative Identify and purchase the desired FAST option s Obtain the invoice the register specific 20 digit FAST Access Code s and...

Page 224: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix A MN CDM750 A 4 Notes...

Page 225: ...s available optional PIIC modules are usually ordered with the modem they are easily field installed The available PIIC modules and reference to their pertinent section in this appendix are as follows...

Page 226: ...ps to install the optional PIIC module s Figure B 1 Step Task 1 Remove the PIIC slot blank panel s by loosening the captive thumbscrews 2 Install the PIIC module s into position using the chassis inte...

Page 227: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix B MN CDM750 B 3 This page is intentionally blank...

Page 228: ...3 T3 STS 1 PIIC Module CEFD P N PL 0000795 Figure B 2 G 703 E3 T3 STS 1 PIIC Module Figure B 3 G 703 E3 T3 STS 1 PIIC Module Block Diagram Name Connector Type Description Direction I O TX IN BNC Data...

Page 229: ...ler 20 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 I...

Page 230: ...e Kit CEFD P N KT 0000255 Figure B 6 STM 1 Copper PIIC Module SFP Installation Use the STM 1 Copper PIIC module in either of the CDM 750 rear panel interface option slots The PIIC module features an S...

Page 231: ...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...

Page 232: ...Multi Mode PIIC Module Kit CEFD P N KT 000025X Figure B 8 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 750 rear panel...

Page 233: ...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...

Page 234: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix B MN CDM750 B 10 Notes...

Page 235: ...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 750 Advanced High Speed Trunking Modem When enab...

Page 236: ...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...

Page 237: ...in data rate This excludes synchronous interfaces such as G 703 T3 E3 interfaces which operate at a fixed data rates 44 768 34 368 Mbps Ethernet is a suitable data stream because the packet nature of...

Page 238: ...k with a 25 Mbps service level agreement SLA between Nigeria and Germany that requires 99 8 availability Once designed the link will provide this level of SLA for all but 17 5 hours of the year Figure...

Page 239: ...dB that throttles throughput down to 31 Mbps Table C 3 summarizes the capacity Figure C 2 User Throughput vs Time and Fades Table C 3 Turning Margin into Additional Capacity Parameter SLA Clear 2 2 d...

Page 240: ...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...

Page 241: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix C MN CDM750 C 7 Figure C 3 ACM over Satellite Generic Example...

Page 242: ...5 would be the guaranteed Es No 2 7 dB plus the Target Margin 1 0 dB 3 7 dB The Target Es No Margin can and should also be used as a way to dial in a maximum fade slope ACM messages sent from the far...

Page 243: ...er compression limit To compensate you may enter additional impairments by modulation type this allows correct parameter adjustment in cases of additional degradation when a transponder is operated cl...

Page 244: ...re are ModCod cases that are simply more reliable with Pilots on even in the case of reasonable phase noise For the purpose of data integrity and maximum ModCod selection the CDM 750 modem always enab...

Page 245: ...76 4 03 8 QPSK 4 5 1 549426 4 68 9 QPSK 5 6 1 615288 5 18 10 QPSK 8 9 1 724416 6 20 11 QPSK 9 10 1 746049 6 42 12 8PSK 3 5 1 739569 5 50 13 8PSK 2 3 1 935658 6 62 14 8PSK 3 4 2 177525 7 91 15 8PSK 5 6...

Page 246: ...on to adjacent ModCods and avoid dithering The minimum distance between adjacent ModCods must be at least the amount of hysteresis the figure used for hysteresis is fixed in the CDM 750 at 0 5 dB The...

Page 247: ...6 presents a practical set of ModCods based on ModCod selection The pruned or inactive ModCods are shown along the baseline of the plot The transition to the next higher ModCod is the Es No spec Es No...

Page 248: ...d up to the maximum purchased symbol rate in 1 sps steps Symbol rate options are 5 Msps standard 18 36 54 and 63 Msps QPSK and 8PSK operate to 63 Msps 16APSK to 47 Msps 32APSK to 38 Msps Additionally...

Page 249: ...3 26 19 59 37 82 06 110 00 12 8PSK 3 5 1 739569 8 70 26 09 59 15 81 76 109 59 13 8PSK 2 3 1 935658 9 68 29 03 65 81 90 98 121 95 14 8PSK 3 4 2 177525 10 89 32 66 74 04 102 34 137 18 15 8PSK 5 6 2 4222...

Page 250: ...e highest b Unlock Action This decides the action taken if the demodulator at the distant end loses lock Select Min recommended or Maintain If the distant end demodulator unlocks the modulator will ei...

Page 251: ...CDM750 C 17 C 5 2 ACM Configuration via the CDM 750 Web Server Interface Chapter 6 ETHERNET BASED REMOTE PRODUCT MANAGEMENT Use the Configuration Modem page to carry out the tasks explained in Sect C...

Page 252: ...INFO RX screens Furthermore if using the CONFIG TX or CONFIG RX menus both the symbol rate and data rate are displayed All of these screens update dynamically if a ModCod changes the parameters are r...

Page 253: ...bandwidth the CDM 750 can be configured to initiate a method for congestion control The means to do this is by enabling Flow Control When Flow Control is Enabled the WAN buffer produces two control si...

Page 254: ...so configured The recommended setting for Minimum ModCod is 4 Comtech EF Data also recommends that you set the Unlock Action to Go to minimum ModCod this will give the most robust link availability R...

Page 255: ...nting error excessive phase noise and certain types of interference However rapidly fluctuating impairments such as scintillation at low antenna look angles at C band will generally not be improved by...

Page 256: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix C MN CDM750 C 22 Notes...

Page 257: ...n Carrier option adds a new dimension to satellite communication optimization D 1 1 What is DoubleTalk Carrier in Carrier The CDM 750 s DoubleTalk Carrier in Carrier CnC option uses a patented signal...

Page 258: ...ve to meet different objectives Conclusion When using the DoubleTalk Carrier in Carrier CnC option up to 50 savings in transponder utilization is possible when carriers share common bandwidth D 2 Appl...

Page 259: ...CDM 750 itself The CnC module tracks and compensates for this frequency offset and drift 3 Atmospheric effects Fading and scintillation can affect amplitude phase and spectral composition of the sign...

Page 260: ...are operated in pairs One outbound with multiple return carriers is not allowed Asymmetric operation is allowed up to a 3 1 ratio of symbol rate The ratio of CnC ratio of interferer power to desired...

Page 261: ...ntaining both carriers on the same band to the CDM 750 which then translates the signal to near baseband where it can be filtered decimated and then processed as a complex envelope signal The CDM 750...

Page 262: ...ex Link with DoubleTalk Carrier in Carrier Figure D 4 Duplex Link Optimization The CDM 750 CnC module operates on the near zero signal before the demodulator and is waveform agnostic This means that n...

Page 263: ...theoretical limits of power and bandwidth efficiencies CnC allows satellite users to achieve spectral efficiencies bps Hz that cannot be achieved with modulation and FEC alone Table D 1 illustrates ho...

Page 264: ...o extract the desired signal from the aggregate due to interference originating from its local modulator However since this interference is produced locally it is possible to estimate and remove its i...

Page 265: ...eved in commercial products with minimal degradation of the demodulator performance D 4 2 Margin Requirements Depending on the product typical interfering signal cancellation is 28 to 35 dB The residu...

Page 266: ...gn it is an iterative process that involves trying different FEC and modulation combinations with CnC until an optimal combination is found For optimal CnC performance it is recommended that the two c...

Page 267: ...Satellite 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 re...

Page 268: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix D MN CDM750 D 12 Link parameters and LST summary for 16APSK 2 3 with Carrier in Carrier is as follows...

Page 269: ...h 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 al...

Page 270: ...Eq BW Leased BW 19 3 MHz Hub HPA 310 W Remote HPA 166 W a 28 7 increase in Remote power D 4 6 2 Power Limited Links Carrier in Carrier can provide substantial savings even when the original link is p...

Page 271: ...s as follows using CnC and DVB S2 reduced the leased bandwidth by almost 50 and HPA power by almost 60 Item Original Link With Carrier in Carrier Savings Hub to Remote Remote To Hub Total Hub to Remot...

Page 272: ...evel 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 the mode...

Page 273: ...Verify that the CnC ratio is within spec for the CDM 750 3 Calculate the Allocated Bandwidth BW and Power Equivalent Bandwidth PEB for the duplex link BWDuplex Link Greater of BWCarrier 1 BWCarrier 2...

Page 274: ...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...

Page 275: ...o 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 CnC...

Page 276: ...pecifications D 7 Carrier in Carrier Summary Comtech EF Data s DoubleTalk Carrier in Carrier can provide significant savings in operational expenses The following considerations must be taken into acc...

Page 277: ...eater of the Allocated Bandwidth and Power Equivalent Bandwidth For example If a carrier requires 3 MHz of Allocated BW and 4 5 MHz of PEB the Leased Bandwidth is 4 5 MHz Bandwidth Power Equivalent PE...

Page 278: ...here SR is the Symbol Rate Es No Eb No 10log SE where SE is Spectral Efficiency C N Ratio of Carrier Power C to Noise N unit in dB Equivalent to Es No when calculated in the Symbol Rate bandwidth C No...

Page 279: ...f Power Spectral Density PSD of the interfering carrier to the desired carrier If looking at the 2 carriers side by side on a spectrum analyzer Quasi Error Free QEF Quasi Error Free QEF corresponds to...

Page 280: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix D MN CDM750 D 24 Notes...

Page 281: ...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...

Page 282: ...corresponds to an Es No of approximately 2 8 dB DVB S2 The relationship used to derive the table values the only simple way for DVB S2 is as follows Es No C N 10log10 10 Co No 10 1 10log10 Spectral Ef...

Page 283: ...1 6 1 3 1 2 6 8 5 8 9 0 7 7 6 9 5 9 5 1 4 7 4 2 3 9 3 7 3 4 3 4 3 4 2 9 2 4 1 9 1 7 1 6 7 1 6 2 9 4 8 1 7 3 6 3 5 5 5 0 4 5 4 3 4 1 3 8 3 7 3 8 3 3 2 8 2 3 2 0 2 0 7 4 6 5 9 7 8 5 7 7 6 7 5 9 5 4 4 9...

Page 284: ...1 14 0 13 8 9 7 9 2 8 9 8 7 8 5 8 4 8 2 8 0 7 8 7 5 7 4 14 3 14 1 10 0 9 5 9 2 9 1 8 8 8 7 8 5 8 3 8 1 7 8 7 7 14 6 14 4 10 3 9 8 9 5 9 4 9 1 9 0 8 9 8 6 8 4 8 1 8 1 14 9 14 8 10 7 10 1 9 9 9 7 9 4 9...

Page 285: ...An 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 forwar...

Page 286: ...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...

Page 287: ...port basis This configuration allows for multiple customer Ethernet interfaces The 10 100BaseT management port is connected to a switch that interfaces optionally with the data traffic switch and the...

Page 288: ...2 Appendix F MN CDM750 F 4 Figure F 3 Improper Use of External Switch with CDM 750 F 4 2 Ethernet Overhead After Ethernet packets are sent from the internal switch to the modem WAN interface Generic...

Page 289: ...sing the word statistics here is to gather naturally associated items This appendix excludes much of the information provided elsewhere in this manual e g Es No RSL etc in order to focus strictly on d...

Page 290: ...satellite flows into this block Block 3 Expansion Slot This is reserved for future plug in modules Block 4 Terrestrial Port Processor Rx This is the counterpart to the Tx processor It forms Ethernet p...

Page 291: ...full in Switch Chip 1 2 Number of VALID acceptable packets that were thrown away due to buffer full Packets from WAN to PORT 1 2 1 Breakout of packets from WAN to Port 1 and inclusive of M C packets...

Page 292: ...recovered in the Deframer Fig B 1 Block 5 G 3 5 ACM Modulator Status Item Comments Current TX ModCod Currently active Tx ModCod Remote Es No Reading Es No from distant end G 3 6 ACM Demodulator Statu...

Page 293: ...ows LDPC and eliminates the flare for any practical range of error rates LDPC also functions differently than Viterbi decoding by using iterative decoding In this process the data initially corrected...

Page 294: ...per transmission hour at the level of a 5 Mbits s single TV service decoder approximately corresponding to a Transport Stream Packet Error Ratio equal to a PER 10 7 before demultiplexer A packet is d...

Page 295: ...DM750 H 3 1 0E 07 1 0E 06 1 0E 05 1 0E 04 1 0E 03 1 0E 02 3 2 1 0 1 2 3 4 5 6 7 8 PER Es No dB DVB S2 QPSK PER vs Es No 1 4 4 5 3 5 3 4 2 5 1 3 2 3 5 6 8 9 9 10 1 2 Figure H 1 DVB S2 QPSK Packet Error...

Page 296: ...king Modem Revision 2 Appendix H MN CDM750 H 4 1 0E 07 1 0E 06 1 0E 05 1 0E 04 1 0E 03 1 0E 02 5 6 7 8 9 10 11 12 PER Es No dB DVB S2 8 PSK PER vs Es No 9 10 2 3 3 5 3 4 5 6 8 9 Figure H 2 DVB S2 8PSK...

Page 297: ...g Modem Revision 2 Appendix H MN CDM750 H 5 1 0E 07 1 0E 06 1 0E 05 1 0E 04 1 0E 03 1 0E 02 8 9 10 11 12 13 14 15 PER Es No dB DVB S2 16 APSK PER vs Es No 9 10 2 3 4 5 3 4 5 6 8 9 Figure H 3 DVB S2 16...

Page 298: ...Modem Revision 2 Appendix H MN CDM750 H 6 1 0E 07 1 0E 06 1 0E 05 1 0E 04 1 0E 03 1 0E 02 12 13 14 15 16 17 18 19 20 PER Es No dB DVB S2 32 APSK PER vs Es No 9 10 4 5 3 4 5 6 8 9 Figure H 4 DVB S2 32...

Page 299: ...1 6 214 x 10 4 1 kilometer 1 x 106 1 x 105 3 938 x 104 3 281 1093 1000 1 0 6214 1 mile 1 609 x 106 1 609 x 105 6 336 x 104 5280 1760 1609 1 609 1 Temperature Conversions Units of Weight Unit Gram Ounc...

Page 300: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...

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