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CDM-600L Satellite Modem

Revision 0

Forward Error Correction Options

MN/CDM600L.IOM

7–7

The Rate 7/8 TPC is extremely powerful, offering performance very close to the original
Rate 3/4 TPC, but using 15% less bandwidth. Note also that the Rate 0.95 TPC adds just
5% FEC overhead, but yields almost identical coding gain to Rate 1/2 Viterbi at a BER of
1 x 10

-7

. Below is a listing of all the available TPC modes and rates in the CDM-600L, as

at April 2002:

Table 7-5. Available TPC Modes

Code Rate/Modulation

Data Rate Range

Rate 21/44 BPSK

4.8 kbps to 3.2 Mbps

(to 4.77 Mbps with High Rate Turbo card)

Rate 5/16 BPSK

4.8 kbps to 2.048 Mbps

(to 3.12 Mbps with High Rate option, but

currently

unavailable)

Rate 1/2 QPSK/Offset QPSK

4.8 kbps to 9.54 Mbps

(High Rate Turbo card only)

Rate 3/4 QPSK/Offset QPSK

7.2 kbps to 5.0 Mbps

(to 15 Mbps with High Rate Turbo card)

Rate 3/4 8-PSK

10.8 kbps to 5.0 Mbps

(to 20 Mbps with High Rate Turbo card)

Rate 3/4 16-QAM

14.4 kbps to 5.0 Mbps

(to 20 Mbps with High Rate Turbo card)

Rate 7/8 QPSK/Offset QPSK

8.4 kbps to 17.5 Mbps

(High Rate Turbo card only)

Rate 7/8 8-PSK

12.6 kbps to 20 Mbps

(High Rate Turbo card only)

Rate 7/8 16-QAM

16.8 kbps to 20 Mbps

(High Rate Turbo card only)

Rate 0.95 QPSK/Offset QPSK

9.1 kbps to 18.88 Mbps

(High Rate Turbo card only)

Rate 0.95 8-PSK

13.6 kbps to 20 Mbps

(High Rate Turbo card only)

7.6.3 End-to-End

Processing

Delay

In many cases, FEC methods that provide increased coding gain do so at the expense of
increased processing delay. However, with TPC, this increase in delay is very modest.
The table below shows, for the CDM-600L, the processing delays for the major FEC
types, including the three TPC modes:

Table 7-6. Turbo Product Coding processing delay comparison

FEC Mode (64 kbps data rate)

End-to-end delay, ms

Viterbi, Rate 1/2

12

Sequential, Rate 1/2

74

Viterbi Rate 1/2 + Reed Solomon

266

Sequential Rate 1/2 + Reed Solomon

522

Turbo Product Coding, Rate 3/4

47

Turbo Product Coding, Rate 21/44, BPSK

64

Turbo Product Coding, Rate 5/16, BPSK

48

Turbo Product Coding, Rate 7/8

245 *

Turbo Product Coding, Rate 0.95

69

Note that in all cases, the delay is inversely proportional to data rate, so for 128 kbps, the
delay values would be half of those shown above. It can be seen that the concatenated
Reed-Solomon cases increase the delay significantly (due mainly to interleaving/de-
interleaving), while the TPC cases yield delays which are less than or equal to Sequential
decoding.

*

A larger block is used for the Rate 7/8 code, which increases decoding delay.

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Summary of Contents for CDM-600L

Page 1: ... in this document supersedes all previously published information regarding this product Product specifications are subject to change without prior notice CDM 600L Open Network Satellite Modem 2 4 kbps 20 Mbps Installation and Operation Manual For Firmware Version 1 1 1 or higher ...

Page 2: ......

Page 3: ...L EA0 Collating Instructions Attach this page to page xi Comments The following changes provide updated information for page xi This information will be incorporated into the next revision Change Specifics FUSES The CDM 600L Satellite Modem is fitted with two fuses one each for line and neutral connections These are contained within the body of the IEC power connector behind a small plastic flap U...

Page 4: ......

Page 5: ... Firmware Version 1 1 1 or higher Part Number MN CDM600L IOM Revision 0 May 21 2003 Copyright Comtech EF Data 2003 All rights reserved Printed in the USA Comtech EF Data 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 Comtech EF Data is an ISO 9001 Registered Company ...

Page 6: ...CDM 600L Satellite Modem Revision 0 Preface MN CDM600L IOM ii This page is intentionally blank ...

Page 7: ...Y 1 6 CHAPTER 2 INSTALLATION 2 1 2 1 UNPACKING 2 1 2 2 MOUNTING 2 2 2 3 CONFIGURATION 2 4 2 4 SELECT INTERNAL IF LOOP 2 4 2 5 CONNECT EXTERNAL CABLES 2 4 CHAPTER 3 FUNCTIONAL DESCRIPTION 3 1 CHAPTER 4 PHYSICAL DESCRIPTION 4 1 4 1 INTRODUCTION 4 1 4 2 FRONT PANEL 4 1 4 3 REAR PANEL 4 2 4 4 DIMENSIONAL ENVELOPE 4 6 CHAPTER 5 CONNECTOR PINOUTS 5 1 5 1 CONNECTOR OVERVIEW 5 1 5 2 OVERHEAD INTERFACE CON...

Page 8: ...RD ERROR CORRECTION OPTIONS 7 1 7 1 INTRODUCTION 7 1 7 2 VITERBI 7 1 7 3 SEQUENTIAL 7 2 7 4 REED SOLOMON OUTER CODEC 7 3 7 5 TRELLIS CODING FAST OPTION 7 5 7 6 TURBO PRODUCT CODEC HARDWARE OPTION 7 6 7 6 1 Introduction 7 6 7 6 2 The Evolution of TPC in Comtech Products 7 6 7 6 3 End to End Processing Delay 7 7 7 6 4 Comparison of all TPC Modes 7 8 7 7 UNCODED OPERATION NO FEC 7 9 CHAPTER 8 OFFSET ...

Page 9: ...Terrestrial or External Reference 10 3 10 2 3 Buffer Enabled RX TX TX Terrestrial or External Reference 10 3 10 3 X 21 NOTES 10 3 10 4 DROP AND INSERT 10 6 10 5 FRAME FORMATS 10 6 10 6 TIME SLOT SELECTION 10 7 10 7 DROP AND INSERT CLOCKING 10 7 10 8 RX BUFFER CLOCK INSERT D I ONLY 10 8 CHAPTER 11 EDMAC CHANNEL 11 1 11 1 THEORY OF OPERATION 11 1 11 2 M C CONNECTION 11 2 11 3 SETUP SUMMARY 11 3 CHAP...

Page 10: ... 5 Message Arguments 15 5 15 5 6 End Of Packet 15 5 CHAPTER 16 BUC FSK COMMUNICATIONS 16 1 16 1 INTRODUCTION 16 1 16 2 MESSAGE STRUCTURE 16 2 16 2 1 Command Message Structure CDM 600L to BUC 16 2 16 2 2 Response Message Structure BUC to CDM 600L 16 3 16 3 POWER CLASS 16 3 16 4 BUC OUTPUT POWER LEVELING 16 3 CHAPTER 17 DST SETUP 17 1 17 1 INITIAL OPERATION 17 1 17 1 1 Prior to turning On Power 17 1...

Page 11: ...bps 7 14 Figure 7 5 Viterbi with concatenated R S Outer Code 7 15 Figure 7 6 Sequential with concatenated R S Outer Code 7 16 Figure 7 7 8 PSK TCM Rate 2 3 with and without concatenated R S Outer Code 7 17 Figure 7 8 Comtech EF Data Turbo Product Codec Rate 3 4 QPSK OQPSK 8 PSK AND 16 QAM 7 18 Figure 7 9 Comtech EF Data Turbo Product Codec Rate 7 8 QPSK OQPSK 8 PSK AND 16 QAM 7 19 Figure 7 10 Rate...

Page 12: ...tor Pin Assignments 5 6 Table 5 7 Auxiliary Serial Connector USB Type B Socket 5 6 Table 5 8 Balanced G 703 Interface Connector Pin Assignments 5 7 Table 5 9 BNC Connectors 5 7 Table 5 10 Alarm Interface Connector Pin Assignments 5 8 Table 6 1 Front Panel LED Indicators 6 2 Table 7 1 Viterbi Decoding Summary 7 2 Table 7 2 Sequential Decoding Summary 7 3 Table 7 3 Concatenated RS Coding Summary 7 4...

Page 13: ...5281 USA 480 333 2200 Main Comtech EF Data Number 480 333 4357 Customer Support Desk 480 333 2161 FAX or E Mail can be sent to the Customer Support Department at service comtechefdata com Contact us via the web at www comtechefdata com To return a Comtech EF Data product in warranty and out of warranty for repair or replacement Request a Return Material Authorization RMA number from the Comtech EF...

Page 14: ...EF Data CDM 600L satellite modem This is a technical document intended for earth station engineers technicians and operators responsible for the operation and maintenance of the CDM 600L Conventions and References Metric Conversion Metric conversion information is located on the inside back cover of this manual This information is provided to assist the operator in cross referencing English to Met...

Page 15: ... Fuses The CDM 600L is fitted with two fuses one each for line and neutral connections These are contained within the body of the IEC power inlet connector behind a small plastic flap For 115 and 230 volt AC operation use T3 15A T0 75A 20mm fuses FOR CONTINUED OPERATOR SAFETY ALWAYS REPLACE THE FUSES WITH THE CORRECT TYPE AND RATING Environmental The CDM 600L must not be operated in an environment...

Page 16: ...le for use in the country of operation If it is necessary to replace this cable ensure the replacement has an equivalent specification Examples of acceptable ratings for the cable include HAR BASEC and HOXXX X Examples of acceptable connector ratings include VDE NF USE UL CSA OVE CEBEC NEMKO DEMKO BS1636A BSI SETI IMQ KEMA KEUR and SEV International Symbols Symbol Definition Symbol Definition Alte...

Page 17: ...0 4 5 Surge Immunity EN 61000 4 6 RF Conducted Immunity EN 61000 4 8 Power frequency Magnetic Field Immunity EN 61000 4 9 Pulse Magnetic Field Immunity EN 61000 4 11 Voltage Dips Interruptions and Variations Immunity EN 61000 4 13 Immunity to Harmonics In order that the Modem continues to comply with these standards observe the following instructions Connections to the transmit and receive IF port...

Page 18: ...EF Data No other warranty is expressed or implied Comtech EF Data specifically disclaims the implied warranties of merchantability and fitness for particular purpose Exclusive Remedies The remedies provided herein are the buyer s sole and exclusive remedies Comtech EF Data shall not be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any ...

Page 19: ...n no plug in cards required including all G 703 types and Drop and Insert operation The IF frequency range covers 950 1950 MHz It includes a programmable 13 18 or 24V LNB power supply at the receive IF connector center conductor and optionally includes a 24 or 48V BUC power supply at the transmit IF connector center conductor A low phase noise 10 MHz reference output is available at both the trans...

Page 20: ...PC This feature enables the modem to automatically adjust its output power to maintain the Eb No of the remote end of the satellite link constant This provides protection against rain fading a particularly severe problem with Ku band links To accomplish this the framed EDMAC mode of operation must be used and the distant end modem constantly sends back information about the demodulator Eb No using...

Page 21: ...rd a universal data interface that eliminates the need to exchange interface cards for different applications The interfaces offered include RS 422 RS 530 DCE at rates up to 10 Mbps X 21 DTE and DCE at rates up to 10 Mbps V 35 DCE at rates up to 10 Mbps Synchronous RS 232 DCE at rates up to 300 kbps G 703 E1 balanced and unbalanced G 703 T1 balanced G 703 E2 balanced and unbalanced G 703 T2 balanc...

Page 22: ...osed Network operation but includes EDMAC and AUPC The following table shows what other options are available Option Description and Comments Option Installation Method Low Rate Variable Data rate 2 4 to 5 0 Mbps BASE UNIT Mid Rate Variable Data rate 2 4 to 10 0 Mbps FAST Full Rate Variable Data rate 2 4 kbps to 20 0 Mbps FAST 8 PSK Modulation Type FAST 16 QAM Modulation Type FAST High Rate IBS ES...

Page 23: ...sely tailored for the initial application 1 3 3 Implementation FAST is factory implemented in the modem at the time of order Hardware options for basic modems can be ordered and installed either at the factory or in the field The operator can select options that can be activated easily in the field depending on the current hardware configuration of the modem The Activation Procedure is described i...

Page 24: ...he front panel display and keypad of the modem or the modem s remote control interface The EDMAC channel can be used to convey M C interface to a BUC at the distant end of a satellite link if it is connected to a CDM 600L This FSK interface with the BUC includes a BUC output power leveling mode where the modem M C monitors the detected BUC output power level reported on the FSK link and automatica...

Page 25: ...tool that will extend more than 1 inch into the container This can cause damage to the modem Unpack the modem as follows 1 Cut the tape at the top of the carton indicated by OPEN THIS END 2 Remove the cardboard foam space covering the modem 3 Remove the modem manual and power cord from the carton 4 Save the packing material for storage or reshipment purposes 5 Inspect the equipment for any possibl...

Page 26: ...ctory Optional rear mounting installation bracket Install optional installation bracket Figure 2 1 using mounting kit KT 6228 2 Optional Mounting Kit KT 6228 2 Quantity Part Number Description 2 FP 6138 1 Bracket Rear Support 4 HW 10 32x1 2RK Bolt 10 Rack 2 HW 10 32HEXNUT Nut 10 Hex 2 HW 10 32FLT Washer 10 Flat 2 HW 10 32X1 4 SHC Screw Socket 10 32 x 1 4inch The tools required for this installatio...

Page 27: ... CDM600L IOM 2 3 Figure 2 1 Installation of the Optional Mounting Bracket KT 6228 2 Equipment Rack Mounting Rail 10 Socket head screw BRACKET BOLTS Support Bracket Back of Modem Note Components of mounting kit KT 6228 1 Bracket 10 Flat Washer 10 Hex Nut ...

Page 28: ...ION chapter The demod should synchronize and the green RECEIVE TRAFFIC LED should illuminate If the unit does not pass this test call the factory for assistance 2 5 Connect External Cables Having verified correct operation in IF loop enter the desired configuration and proceed to connect all external cables If difficulties occur please call the factory for assistance Note The modulator gives an ou...

Page 29: ...the encoder the data is fed to the transmit digital filters which perform spectral shaping on the data signals The resultant I and Q signals are then fed to the BPSK QPSK Offset QPSK 8 PSK 16 QAM modulator The carrier is generated by a frequency synthesizer and the I and Q signals directly modulate this carrier to produce an IF output signal The RX IF signal is translated to baseband using the car...

Page 30: ... Forward Error Correction These functions are shown in Figure 3 1 Figure 3 1 CDM 600L Modem Block Diagram LVDS INTERFACE TX FRAMING IBS IDR D I OR EDMAC TX REED SOLOMON WITH SCRAMB LER SEQ ENCODER TX G703 T1 E1 DEFRAMER AND INTERFACE RS 422 V 35 OR RS 232 INTERFACE G703 T2 E2 INTERFACE TX LINE DECODING RX G703 T1 E1 DEFRAMER AND INTERFACE IBS OR EDMAC SCRAM BLER MUX DEMUX INT CLK DDS ENC CLK DDS P...

Page 31: ...facilitate removal from and placement into a rack Figure 4 1 shows the front panel of the modem Figure 4 1 CDM 600L Front Panel 4 2 Front Panel The CDM 600L front panel features a Vacuum Fluorescent Display VFD a keypad and eight LED indicators The user enters data via the keypad and messages are displayed on the VFD The LEDs indicate in a summary fashion the status of the unit ...

Page 32: ...eedback These six switches are identified as arrows ENTER and CLEAR The functions of these keys are described in the FRONT PANEL OPERATION section There are eight LEDs on the front panel The behavior of these LEDs is described in the FRONT PANEL OPERATION section 4 3 Rear Panel Figure 4 2 CDM 600L Rear Panel External cables are attached to connectors on the rear panel of the CDM 600L These compris...

Page 33: ...or conforms to the RS 530 pinout which allows for connection of different electrical standards including RS 422 V 35 and RS 232 A shielded 25 pin D type provides a very solid solution to EMC problems unlike the sometimes used V 35 Winchester connector IMPORTANT It is the responsibility of the user to provide the appropriate cables to connect to this RS 530 connector Overhead data connector P3A The...

Page 34: ...the external reference input the modem will revert to the internal 10 MHz reference Form C Traffic alarm connector P5B The Alarms connector is a 15 pin D type male DB15 M This provides the user with access to the Form C relay contacts which indicate the fault status of the unit These are typically connected to an external fault monitoring system often found in satellite earth stations In addition ...

Page 35: ...ort Remote Control connector P4B The Remote Control connector is a 9 pin D type male DB9 M Access is provided to remote control ports of the modem both RS 232 and RS 485 Auxiliary Serial connector P6 This is an additional RS 232 serial port which is only used when the modem is part of a 1 1 pair It uses a USB Type B connector WARNING Although this port uses a USB connector the signals are not USB ...

Page 36: ...cription MN CDM600L IOM 4 6 4 4 Dimensional Envelope CLR EN T 19 0 1 72 16 53 ON LI NE RECEI VE TRAFFI C TRA NSMIT TRAFFIC UNIT STATUS EDMA CM ODE STORED EVE NT TEST MODE REMO T E SATELLITE MO DEM CDM 600 18 0 Figure 4 3 CDM 600L Dimensional Envelope ...

Page 37: ...5 1 Chapter 5 CONNECTOR PINOUTS 5 1 Connector Overview The rear panel connectors Figure 5 1 provide all necessary external connections between the modem and other equipment ...

Page 38: ... J9 BNC Input Audio P4A 9 pin D female Audio Signal Input Output Remote Control P4B 9 pin D male Remote Interface IDR Alarm P5A 15 pin D female Alarm Alarms P5B 15 pin D male FORM C Alarms Balanced G 703 P7 15 pin D female Balanced G 703 Data IDI J10A BNC Insert Data In DDO J11A BNC Drop Data Output RX Unbalanced J10B BNC Receive G 703 IDI TX Unbalanced J11B BNC Transmit G 703 IDI External Referen...

Page 39: ...tet Clock TX OCT A Out 16 IDR 64 kbps ESC RX Data RX 422DAT B Out 3 IDR 64 kbps ESC RX Data RX 422DAT A Out 9 IDR 64 kHz ESC RX Clock RX 422CLK B Out 17 IDR 64 kHz ESC RX Clock RX 422CLK A Out 19 IDR 1 kHz RX Octet Clock RX OCT B Out 4 IDR 1 kHz RX Octet Clock RX OCT A Out 20 Balanced Ext Ref Clock EXT CLK B In 23 Balanced Ext Ref Clock EXT CLK A In 13 IBS ESC RS232 TX Data TX 232 DATA In 22 IBS E...

Page 40: ...A DB 114 12 INT TX Clock B Modem to DTE ST B SCT B 114 3 RX Data A Modem to DTE RD A RD A BB 104 16 RX Data B Modem to DTE RD B RD B 104 17 RX Clock A Modem to DTE RT A SCR A DD 115 9 RX Clock B Modem to DTE RT B SCR B 115 8 Receiver Ready A Modem to DTE RR A RLSD CF 109 10 Receiver Ready B Modem to DTE RR B 109 23 External Carrier Off RS 232 1 or TTL low DTE to Modem 7 Signal Ground SG SG AB 102 ...

Page 41: ... Out 3 Common 5 5 Remote Control Interface Connector P4B The remote control interface connection is a 9 pin male connector located on the rear panel of the modem Refer to Table 5 5 for pin assignments The remote control port is intended for connection to an M C computer or terminal device This interface is user selectable for either RS 232 or RS 485 Table 5 5 Remote Control Interface Connector Pin...

Page 42: ...ackward Alarm 2 is not active BA 2 NO BA 2 COM BA 2 NC 6 13 5 Backward Alarm 3 is active Backward Alarm 3 is not active BA 3 NO BA 3 COM BA 3 NC 14 TBD MON B 8 15 7 Backward Alarm 4 is active Backward Alarm 4 is not active BA 4 NO BA 4 COM BA 4 NC 12 Ground GND 5 7 Auxiliary Serial Connector P6 Provides an RS 232 serial link between the modem and the CRS 150 1 1 Redundancy Switch Table 5 7 Auxilia...

Page 43: ...round GND 12 Drop Data Output DDO Out 5 Drop Data Output DDO Out 13 Insert Data Input IDI In 6 Insert Data Input IDI In 14 Not Used 7 Not Used 15 Not Used 8 Not Used Use for all non Drop and Insert and T2 E2 balanced applications 5 9 BNC Connectors The BNC connector located on the rear panel of the modem Refer to Table 5 9 for pin assignments Table 5 9 BNC Connectors BNC Connector Reference Descri...

Page 44: ...ult De energized Faulted Unit Fault Energized No Fault Unit Fault UNIT NC UNIT NO UNIT COM 11 3 RX I Channel Constellation monitor RX Q Channel Constellation monitor RX I RX Q 10 No Connection N C 2 AGC Voltage Rx signal level 0 to 2 5 volts AGC 9 EXT Carrier OFF EXT OFF 1 Ground GND 5 11 AC Power Connector A standard detachable non locking 3 prong power cord IEC plug supplies the Alternating Curr...

Page 45: ...vision 0 Connector Pinouts MN CDM600L IOM 5 9 5 12 Ground Connector A 10 32 stud on the rear panel of the modem is used for connecting a common chassis ground among equipment Note The AC power connector provides the safety ground ...

Page 46: ...CDM 600L Satellite Modem Revision 0 Connector Pinouts MN CDM600L IOM 5 10 This page is intentionally left blank ...

Page 47: ...available options and prompt the user to carry out a required action The display has two lines each of 40 characters On most menu screens the user will observe a flashing solid block cursor which blinks at a once per second rate This indicates the currently selected item digit or field Where this solid block cursor would obscure the item being edited for example a numeric field the cursor will aut...

Page 48: ... Rx Traffic fault exists the demod may still be OK Green The Unit is On Line and carrying traffic On line Off The Unit is Off Line standby forced by externally connected 1 1 or 1 N redundancy system Orange There is a Stored Event in the log which can be viewed from the front panel or retrieved via the remote control interface Stored Event Off There are no Stored Events Orange The Unit is in Remote...

Page 49: ...urns the display to the previous selection Left Right These arrows are used to move to the next selection or to move the cursor functions At times they may also used to move from one section to another Up Down These arrows are used primarily to change configuration data numbers At times they may also be used to move from one section to another IMPORTANT The keypad has an auto repeat feature If a k...

Page 50: ...PTIONS ENCODER MODULATION MOD TYPE FEC RATE DATA DATA RATE DATA SENSE INVERT SCRAMBLER CONFIGURE RECEIVE RECEIVE IF FREQ ACQ SWEEP RSI DECODER DEMOD DEMOD TYPE FEC RATE DATA DATA RATE DATA SENSE INVERT DESCRAMBLER EB NO ALARM THRESHOLD CONFIGURE CLOCKS TRANSMIT CLOCK RECEIVE CLOCK BUFFER EXTERNAL REFERENCE CONFIGURE DROP AND INSERT DROP TYPE CHANNEL TIMESLOTS INSERT TYPE CHANNEL TIMESLOTS LOOP REF...

Page 51: ...current status of the modem and view the log of stored events for the modem STORE LOAD Permits the user to store and retrieve up to 10 different modem configurations UTILITY Permits the user to perform miscellaneous functions such as setting the Real Time Clock adjusting the display brightness etc ODU Permits the user to control the ODU FSK LNB and BUC settings FAST Fully Accessible System Topolog...

Page 52: ...or External Clock Reference D I Permits the user to select Drop or Insert options REFERENCE Permits the user to select either INTernal 10 MHz REFerence clock or an EXTernal REFerence clock at 1 2 5 10 or 20 MHz EDMAC Permits the user to select EDMAC options MISC Permits the user to select view or change various other parameters REMOTE Remote Control Permits the user to define whether the unit is b...

Page 53: ...e INTERFACE and FRAMING type for both Transmit and Receive Once these have been selected the user is only presented with menu choices that are applicable to those particular modes Examples If a G 703 interface is selected the data rate menu will be restricted to only the appropriate G 703 rates If an IDR framing mode is selected the data rate choices will be limited to only those rates specified b...

Page 54: ...arameters on the top line to be edited using the arrow keys Observe the Data Symbol rates on the bottom line Press ENTER CONFIG TX TX IF Three TX settings can be set from this menu Select the parameter to edit using the arrow keys The options for the TX carrier are shown in parentheses To change the setting use the arrow keys Select either ON OFF or RTI then press ENTER IMPORTANT RTI means RECEIVE...

Page 55: ...f the digit using the arrow keys When editing is complete press ENTER Note that the range is from 950 to 1950 MHz SPECTRUM INVERT should normally be in the OFF position When in the ON position and QPSK Offset QPSK or 8 PSK is selected the Tx spectrum is inverted which is the same as reversing the direction of phase rotation in the modulator In BPSK the time order of bits out of the FEC encoder is ...

Page 56: ...RM Select the action that will occur if the remote demod is unlocked The choices are NOM PWR Nominal Power where the output level will revert to the nominal power level set under MANUAL or MAX PWR Maximum Power where the ouput level will change to the maximum permitted Press ENTER CONFIG TX ENCODER Select the parameter to edit using the arrow keys The Encoder options are shown in the parentheses S...

Page 57: ...re is a 1 in 4 chance that the data will be correct CONFIG TX ENCODER REED SOLOMON ON Use the arrow keys to select one of the listed parameters and press ENTER Selections depend on the Framing mode Possible selections include IESS 310 219 201 open or closed network IBS 126 112 open or closed network EDMAC 200 180 closed network IDR 225 205 open network IDR 194 178 open network UNFRAMED 220 200 clo...

Page 58: ...edited using the arrow keys The value of the digit is changed using the arrow keys Press ENTER NOTE The minimum and maximum data rates are dependent on Modulation type and FEC encoder Rate If the user changes the Modulation or FEC and the data rate becomes invalid the Data Rate will be adjusted automatically The upper range of data rate will be dictated by the FAST option installed When Drop Frami...

Page 59: ...ange compared to the data rate will cause excessively long acquisition times For example selecting 32 kHz with a data rate of 2 4 kbps BPSK will result in an average acquisition time of around 3 minutes Edit the Receive Frequency Rx FREQ of the demodulator Select the digit to be edited using the arrow keys The value of the digit is changed using the arrow keys Press ENTER Note that the range is fr...

Page 60: ...selects Differential Decoding OFF there is no way for the modem to resolve the phase ambiguities associated with PSK modulations For BPSK there is a 1 in 2 chance that the polarity of the data will be correct In QPSK there is a 1 in 4 chance that the data will be correct CONFIG RX DECODER REED SOLOMON ON Use the arrow keys to select one of the listed parameters and press ENTER Selections depend on...

Page 61: ...A The top line permits the data rate to be edited Select the digit of the Receive Data Rate using the arrow keys Edit the value of the digit using the arrow keys Press ENTER NOTE The minimum and maximum data rates are dependent on Demodulation type and FEC decoder Rate If the user changes the Modulation or FEC and the data rate becomes invalid the Data Rate will be adjusted automatically The upper...

Page 62: ...descrambler Intelsat variant will be used If IBS framing is selected the IESS 309 descrambler will be used etc etc CONFIG RX EbNo Select the digit of the Alarm point to be edited using the arrow keys Edit the value of the digit using the arrow keys Press ENTER The range of values is from 00 1 to 16 0 dB The user may select a value here and if the Eb No falls below this value a receive traffic faul...

Page 63: ...ed to the RX buffer clock source This output clock is Send Timing Choosing RX LOOP will not automatically select RX SAT as the buffer clock source This allows for increased flexibility for modem clock selection Normally the user will select RX SAT but the other choices also are available EXTERNAL REFERENCE indicates that an unbalanced high stability source is expected at the J9 BNC connector or a ...

Page 64: ...ize in milliseconds is shown Edit each digit of the buffer size using the arrow keys Press ENTER Note When the Rx data rate is set to one of the four G 703 rates the minimum buffer size and step size are limited to the value shown in the table below In addition Insert Framing follows the same rule regardless of n x 64 data rate depending upon whether the Insert Type is T1 or E1 If none of these ca...

Page 65: ...s select one of the five parameters on the screen Note that Drop and Insert operation is a FAST option Selecting LOOP will tie Drop Data Out DDO to Insert Data Input IDI without the user having to externally connect cables to these ports The Drop Type and Insert Type and Loop Y N are edited on this screen using the arrow keys The Drop Insert Types are T1 D4 T1 ESF E1 CCS E1 CAS To edit the Channel...

Page 66: ...to edit using the arrow keys and edit the value using the arrow keys then press ENTER The number of Channels and Time slots shown depends on the data rate If the data rate is 1920 kbps then only the E1 formats are available and the CHAN TS menus are disabled This the fixed channel mode where all timeslots are allocated in order 6 3 1 7 CONFIG REFERENCE Select either an internal 10 MHz reference cl...

Page 67: ...eration specified in this manual 6 3 1 9 CONFIG MISC Select the parameter to edit using the arrow keys then press ENTER CONFIG MISC G 703 CODE Parameters may only be edited if the Interface Type is G 703 Use the arrow keys to select the parameter to edit Select either appropriate G 703 code using the arrow keys then press ENTER Note that the choices displayed here will depend on the G 703 interfac...

Page 68: ...he arrow keys then press ENTER CONFIG MISC ADPCM AUDIO VOLUME This menu permits the gain or volume of the audio ESC circuits for both Receive and Transmit to be varied Note that the step size is 2dB Select the appropriate volume using the arrow keys and edit the volume using the arrow keys and press ENTER CONFIG MISC HIGH RATE IBS ESC The High Rate IBS is available as a FAST option in conjunction ...

Page 69: ... Interface Address or Baudrate Edit the Interface type Baudrate and each digit of the Address using the arrow keys For RS 485 the permitted address range is 1 to 9999 Address 0 is reserved for universal addressing For RS 232 the Address is fixed at 0000 CONFIG REMOTE CONTROL CHAR FORMAT Edit the I O character format using the arrow keys The options are N81 No parity 8 Data bits 1 Stop bit E72 Even...

Page 70: ...whenever the modulator senses that the all ones condition is present in the terrestrial data If Rx SAT AIS is set to ACTIVE a fault will be generated whenever the demodulator senses that the all ones condition is present in the receive data If an alarm is MASKED no alarm will be generated CONFIG MASK BUFFER SLIP Select either ACTIVE or MASKED using the arrow keys then press ENTER If the user selec...

Page 71: ...ONFIG MASK SATELLITE ALARMS Select either Tx or Rx using the arrow keys then press ENTER CONFIG MASK SATELLITE ALARMS TX Select the Backward Alarm BWA to be edited using the arrow keys Edit the settings using the arrow keys then press ENTER Select how the TX IDR backward alarm inputs are to be used An activated alarm may respond to a hardware input at P5A H W or be software controlled by a receive...

Page 72: ...ms using the arrow keys then press ENTER 6 3 1 12 CONFIG STATISTICS Edit the logging interval the period of time over which the statistics will be measured using the arrow keys then press ENTER Setting a value of 00 disables the feature no logging The user can choose 00 10 20 30 40 50 60 70 80 or 90 minutes TERR ALM TX ACTIVE ACTIVE MASK RX OFF OFF ENABLED LINK STATISTICS LOGGING INTERVAL 00 minut...

Page 73: ...tion parameters are temporarily changed to match those of the transmit side When NORMAL is again selected all of the previous values are restored DIG LOOP Digital Loopback This test mode invokes a digital loopback which loops data at the output of the Reed Solomon encoder on the transmit side back into the Reed Solomon decoder on the receive side This tests all of the interface transmit baseband c...

Page 74: ...CDM 600L Satellite Modem Revision 0 Front Panel Operation MN CDM600L IOM 6 28 Figure 6 4 Loopback Modes ...

Page 75: ...gh each menu in succession Press ENTER to continue through all the configurations Note that the user may only view the configurations no editing is possible Press CLEAR to discontinue 6 3 3 2 INFO ID This displays the user defined Circuit ID string 40 characters which is entered via the UTILITY ID screen To return to the previous menu press ENTER 6 3 3 3 INFO MODE An example of a Mode Information ...

Page 76: ...2 3 3 4 7 8 0 95 5 16 21 44 or 1 1 SCRM NONE or IESS Turbo only 6 3 3 5 INFO RX A sample display of RX Info is shown The information displayed here is as follows Top line RX Frequency Eb No Sweep Range RSI XXXX XXXX MHz 12 dB Alarm Point up to 500 kHz RSI Rx Spectral Inversion I Inverted on N Not inverted off Bottom line Decoder Data Rate Demodulation FEC rate Descrambler FEC type VIT SEQ TCM VIT ...

Page 77: ...is enabled the EDMAC Mode and Address are shown 6 3 3 8 INFO DROP TYPE This screen shows the Drop Type Pressing ENTER takes the user back to the previous menu 6 3 3 9 INFO INSERT TYPE This screen shows the Insert Type Pressing ENTER takes the user back to the previous menu CLOCKS TX INT SCT RX RX SAT REF INT BUFFER SIZE 00016 EDMAC FUNCTION ON EDMAC MODE MASTER EDMAC ADDR 0020 DROP TYPE CH 1 E1 CC...

Page 78: ...back to the previous menu 6 3 3 11 INFO ALARMS MASK This screen shows only the alarm s which are currently masked TX AIS RX AIS BUF SLIP AGC EBNO SAT TERR If an alarm is not masked a blank is displayed in the relevant screen position 6 3 3 12 INFO MISC This screen shows the following Test Mode 1 1 Link Status Redundancy Status REMOTE CONTROL LOCAL ADDRESS 0000 INTERFACE RS 232 9600 BAUD N81 ALARMS...

Page 79: ...n the event log using the arrow keys Pressing ENTER or CLEAR will take the user back to the previous menu The event log can store up to 199 events When a fault condition occurs it is time stamped and put into the log Similarly when the fault condition clears this is also recorded If the user selects CLEAR ALL the event log is cleared and the user is taken directly back to the previous menu However...

Page 80: ...will show LOSS rather than indicate a value However the average value while the demod was locked will still be calculated and shown If on the other hand the demodulator has been unlocked for the entire measurement interval the average Eb No will also show LOSS The display will show LOSS LOSS If the measured values are 16 0 dB the display will show 16 0 dB If AUPC is not enabled the values of maxim...

Page 81: ... buffer is emptying and 50 indicates that it is filling RX LEVEL A dBm reading indicating the signal level of the desired receive carrier 6 3 4 5 MONITOR AUPC PARAMS The top line displays the value of Remote Eb No of the demodulator at the distant end of the satellite link The Remote Eb No will display UNLOCK if the remote DEMOD is unlocked The bottom line shows how much the AUPC system has increa...

Page 82: ...is enabled displays the fault status of the BUC PLL synthesizers VER If BUC FSK is enabled displays the M C software version of the BUC 6 3 5 STORE LOAD Select LOAD STORE or EDIT using the arrow keys then press ENTER The user can store load up to 10 different modem configurations or record the date and time of stored configurations in the non volatile memory of the modem These configurations can b...

Page 83: ...the digit to be edited using the arrow keys change the value of the digit using the arrow keys then press ENTER IMPORTANT Note that in accordance with international convention the date is shown in DAY MONTH YEAR format 6 3 6 2 UTILITIES BRIGHTNESS To edit the display BRIGHTNESS use the arrow keys Press ENTER when the brightness is suitable Note that the values of brightness that can be selected ar...

Page 84: ...s currently on line pressing ENTER will cause the unit to switch to standby 6 3 6 5 UTILITIES CIRCUIT ID Edit the Circuit ID string using the and arrow keys Only the bottom line is available 40 characters Use the arrow keys to position the cursor on to the character to be edited Edit the character using arrow keys The following characters are available Space 0 9 and A Z When the user has composed ...

Page 85: ...em IF input output frequencies BUC FSK BUC CONFIG Provides access to lower level menu for FSK monitor and control communication with an FSK capable BUC Provides access to lower level menu to configure BUC related items LNB CONFIG Provides access to lower level menu to configure LNB related items BUC LO Allows setup to program Transmit frequency in terms of terminal uplink frequency rather than mod...

Page 86: ... OFF Use arrow keys to select ON and OFF and press ENTER 10 MHz Turns the 10 MHz reference output to the BUC ON and OFF Use arrow keys to select ON or OFF and press ENTER ALARM LOW Sets the BUC low current alarm threshold in amps Use and arrow keys set the threshold and press ENTER ALARM HIGH Sets the BUC high current alarm threshold in amps Use and arrow keys set the threshold and press ENTER CAR...

Page 87: ... for low side noninverting mix and press ENTER ODU LNB CONFIG Select a parameter to edit using the arrow keys VOLTAGE Sets the voltage for the LNB power supply to 13 18 or 24V Use arrow keys to select the voltage and press ENTER POWER Turns the LNB power supply ON and OFF Use arrow keys to select ON and OFF and press ENTER 10 MHz Turns the 10 MHz reference output to the LNB ON and OFF Use arrow ke...

Page 88: ...se arrow keys to select HIGH for high side inverting mix or LOW for low side noninverting mix and press ENTER 6 3 8 FAST Select whether to change or view current settings using arrow keys 6 3 8 1 FAST SET FAST is the way to enable new options in the modem Obtain the FAST code for the new option from Comtech EF Data Enter the code carefully Use the arrow keys to move the cursor to each character Us...

Page 89: ...ellite Modem Revision 0 Front Panel Operation MN CDM600L IOM 6 43 6 3 8 2 FAST VIEW Use the arrow keys to show which FAST options are currently installed VIEW OPTIONS 10 9 8 7 6 5 4 3 2 1 Special Option 1 Installed ...

Page 90: ...CDM 600L Satellite Modem Revision 0 Front Panel Operation MN CDM600L IOM 6 44 This page is intentionally left blank ...

Page 91: ...mited to Rate 5 16 BPSK Rate 21 44 BPSK and Rate 3 4 QPSK Offset QPSK 8 PSK and 16 QAM The High Rate option provides data rate capability up to 20 Mbps in addition to Rate 7 8 and Rate 0 95 capability Turbo Product Coding provides the best Forward Error Correction technology currently available and is now offered with a sufficient range of code rates and modulation types that link performance can ...

Page 92: ...raint length produce small error bursts good for coded voice No pronounced threshold effect fails gracefully Coding gain independent of data rate 7 3 Sequential Although the method of convolutional coding and Sequential decoding appears to be very similar to the Viterbi method there are some fundamental differences To begin with the convolutional encoder is said to be systematic it does not alter ...

Page 93: ... Codec with Viterbi decoder first became popular when it was introduced by Intelsat in the early 1990 s It permits significant improvements in error performance without significant bandwidth expansion The coding overhead added by the R S outer Codec is typically around 10 which translates to a 0 4 dB power penalty for a given link Reed Solomon codes are block codes as opposed to Viterbi and Sequen...

Page 94: ...8 Standard IESS308 T2 E2 126 112 Standard IESS309 modes A characteristic of concatenated R S coding is the very pronounced threshold effect For any given modem design there will be a threshold value of Eb No below which the demodulator cannot stay synchronized This may be due to the carrier recovery circuits or the synchronization threshold of the primary FEC device or both In the CDM 600L and Rat...

Page 95: ...ers are put in to service the transponders are no longer power limited but bandwidth limited In order to maximize transponder capacity they looked at 8 PSK as a method of reducing the occupied bandwidth of a carrier and adopted Qualcomm s pragmatic TCM at Rate 2 3 A Rate 2 3 8 PSK TCM carrier occupies only 50 of the bandwidth of a Rate 1 2 QPSK carrier However the overall coding gain of the scheme...

Page 96: ...ut error rate becomes unusable This is considered to be a particularly advantageous characteristic in a fading environment Typically in QPSK 8 PSK and 16 QAM TPC modes the demod and decoder can remain synchronized 2 3 dB below the Viterbi Reed Solomon or TCM cases With this release of the CDM 600L Comtech now provides the best Forward Error Correction technology currently available offering a very...

Page 97: ... 16 QAM 16 8 kbps to 20 Mbps High Rate Turbo card only Rate 0 95 QPSK Offset QPSK 9 1 kbps to 18 88 Mbps High Rate Turbo card only Rate 0 95 8 PSK 13 6 kbps to 20 Mbps High Rate Turbo card only 7 6 3 End to End Processing Delay In many cases FEC methods that provide increased coding gain do so at the expense of increased processing delay However with TPC this increase in delay is very modest The t...

Page 98: ...PSK Rate 0 95 Turbo 6 4 dB 6 0 dB 6 9 dB 6 5 dB 1 90 bits Hz 0 53 x bit rate 626 kHz 8 PSK Rate 2 3 TCM and R S IESS 310 6 5 dB 5 6 dB 6 9 dB 6 0 dB 1 82 bits Hz 0 56 x bit rate 666 kHz 8 PSK Rate 3 4 Turbo 6 2 dB 5 7 dB 6 8 dB 6 3 dB 2 25 bits Hz 0 44 x bit rate 529 kHz 8 PSK Rate 7 8 Turbo 7 0 dB 6 6dB 7 2 dB 6 8 dB 2 62 bits Hz 0 38 x bit rate 453 kHz 8 PSK Rate 0 95 Turbo 9 3 dB 8 9 dB 10 3dB ...

Page 99: ...oach PSK demodulators have two inherent undesirable features The first of these is known as phase ambiguity and is due to the fact the demodulator does not have any absolute phase reference and in the process of carrier recovery the demodulator can lock up in any of K phase states where K 2 for BPSK K 4 for QPSK Offset QPSK Without the ability to resolve these ambiguous states there would be a 1 i...

Page 100: ...t intervals of one quarter of the symbol rate away from the carrier Fortunately when FEC decoding is used the decoder synchronization state can be used to verify the correct lock point has been achieved and to reject the false locks However if uncoded operation is used there is no way to recognize a data false lock The demodulator will indicate that it is correctly locked but the data out will not...

Page 101: ...7 1 Viterbi Decoding 1E 9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Specification limit Rate 1 2 Coding Uncoded BPSK QPSK Typical Performance Specification limit Rate 3 4 Coding 1 2 3 4 5 6 7 8 9 10 11 12 Specification limit Rate 7 8 Coding BER Viterbi Decoding ...

Page 102: ...ial Decoding 64 kbps 1E 9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Specification limit Rate 1 2 Coding Uncoded BPSK QPSK Typical Performance Specification limit Rate 3 4 Coding 1 2 3 4 5 6 7 8 9 10 11 12 Specification limit Rate 7 8 Coding BER Sequential Decoding 64 kbps ...

Page 103: ...l Decoding 1024 kbps 1E 9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Specification limit Rate 1 2 Coding Uncoded BPSK QPSK Typical Performance Specification limit Rate 3 4 Coding 1 2 3 4 5 6 7 8 9 10 11 12 Specification limit Rate 7 8 Coding BER Sequential Decoding 1024 kbps ...

Page 104: ... Sequential Decoding 2048 kbps 1E 9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Typical performance Rate 1 2 Coding Uncoded BPSK QPSK Typical performance Rate 3 4 Coding 1 2 3 4 5 6 7 8 9 10 11 12 Typical performance Rate 7 8 Coding BER Sequential Decoding 2048 kbps ...

Page 105: ... 9 10 11 12 Eb No in dB Specification Limit Rate 1 2 and 220 200 Outer Code Uncoded BPSK QPSK 1 2 3 4 5 6 7 8 9 10 11 12 BER Viterbi with concatenated RS 220 200 Outer Code Combined sync threshold demod and Viterbi Decoder Rate 1 2 Sync threshold Rate 3 4 Specification Limit Rate 3 4 and 220 200 Outer Code Specification Limit Rate 7 8 and 220 200 Outer Code Sync threshold Rate 7 8 Typical performa...

Page 106: ...11 12 Eb No in dB Specification Limit Rate 1 2 and 220 200 Outer Code Uncoded BPSK QPSK 1 2 3 4 5 6 7 8 9 10 11 12 BER Sequential with concatenated RS 220 200 Outer Code 512 kbps Combined sync threshold demod and Sequential Decoder Rate 1 2 Sync threshold Rate 3 4 Specification Limit Rate 3 4 and 220 200 Outer Code Specification Limit Rate 7 8 and 220 200 Outer Code Sync threshold Rate 7 8 Typical...

Page 107: ...1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Specification limit Rate 2 3 Coding and 219 201 RS Outer Code Uncoded BPSK QPSK Typical Performance Specification limit Rate 2 3 Coding 1 2 3 4 5 6 7 8 9 10 11 12 BER 8 PSK TCM Rate 2 3 Decoding with and without 219 201 RS Outer Code Performance with CDM 600 Firmware Version 1 1 5 or higher ...

Page 108: ... 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded BPSK QPSK Comtech Turbo Product Codec Rate 3 4 QPSK OQPSK 8 PSK and 16 QAM 1 2 3 4 5 6 7 8 9 10 11 12 BER Spec limit Rate 3 4 16 QAM Spec limit Rate 3 4 8 PSK Spec limit Rate 3 4 QPSK OQPSK Typical performance Uncoded 8 PSK Uncoded 16 QAM Performance with CDM 600 Firmware Version 1 1 5 or higher ...

Page 109: ... 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded BPSK QPSK Comtech Turbo Product Codec Rate 7 8 QPSK OQPSK 8 PSK and 16 QAM 1 2 3 4 5 6 7 8 9 10 11 12 BER Spec limit Rate 7 8 16 QAM Spec limit Rate 7 8 8 PSK Spec limit Rate 7 8 QPSK OQPSK Typical performance Uncoded 8 PSK Uncoded 16 QAM Performance with CDM 600 Firmware Version 1 1 5 or higher ...

Page 110: ...E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded BPSK QPSK Comtech Turbo Product Codec Rate 1 2 QPSK OQPSK Rate 0 95 QPSK OQPSK and 8 PSK 1 2 3 4 5 6 7 8 9 10 11 12 BER Spec limit Rate 0 95 8 PSK Spec limit Rate 0 95 QPSK OQPSK Spec limit Rate 1 2 QPSK OQPSK Typical performance Uncoded 8 PSK Performance with CDM 600 Firmware Version 1 1 5 or higher ...

Page 111: ...ate 21 44 BPSK and Rate 5 16 BPSK Turbo 1E 9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded BPSK QPSK Comtech Turbo Product Codec Rate 21 44 BPSK Rate 5 16 BPSK 1 2 3 4 5 6 7 8 9 10 11 12 BER Spec limit Rate 21 44 BPSK Spec limit Rate 5 16 BPSK Typical performance ...

Page 112: ...Code 1E 9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Specification limit Rate 3 4 Viterbi and 220 200 RS Outer Code Uncoded BPSK QPSK Typical Performance Specification limit Rate 7 8 Viterbi and 220 200 RS Outer Code 1 2 3 4 5 6 7 8 9 10 11 12 BER 16 QAM Viterbi Rate 3 4 and Rate 7 8 with 220 200 RS Outer Code Uncoded 16 QAM ...

Page 113: ...n Options MN CDM600L IOM 7 23 Figure 7 13 Differential Encoding No FEC no scrambling 1E 9 1E 8 1E 7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded BPSK QPSK Differential Encoding No FEC no scrambling 1 2 3 4 5 6 7 8 9 10 11 12 BER ...

Page 114: ...CDM 600L Satellite Modem Revision 0 Forward Error Correction Options MN CDM600L IOM 7 24 This page is intentionally blank ...

Page 115: ...owth and at the extreme hard limiting the original unfiltered sin x x spectrum would result In most systems this would cause an unacceptable level of interference to adjacent carriers and would cause degradation of the BER performance of the corresponding demodulator To overcome the problem of the envelope collapsing to a point of zero amplitude Offset QPSK places a delay between I and Q channels ...

Page 116: ...be longer especially at low data rates 2 The acquisition threshold is higher than for normal QPSK although the demodulator will maintain lock down to its normal levels The acquisition thresholds are as follows 7 0 dB Eb No for Rate 1 2 5 2 dB Eb No for Rate 3 4 4 8 dB Eb No for Rate 7 8 4 0 dB Eb No for Uncoded operation No FEC ...

Page 117: ...p to 2048 kbps ADPCM Audio 2 Channels 64 kbps only full duplex Engineering Service Channel Earth Station to Earth Station Channel EIA 232 data synchronous at 1 480 of the primary data EIA 232 data asynchronous at 1 2000 of the primary data High Rate Engineering Service Channel Future Upgrade ESC Data Interface Type Async configurable async character format ESC Data Rate Example 2400 baud at 64 kbp...

Page 118: ...ng consult factory 9 2 4 IBS Scrambling Provides the synchronous scrambling descrambling of the satellite framed data specified in IESS 309 Base modem scrambling descrambling is disabled in this mode 9 3 Drop and Insert Primary Data Rates Supported G 703 1544 kbps SD RD DDO IDI 2048 kbps SD RD DDO IDI Satellite Data Rates Supported all have 16 15 overhead N x 64 kbps N 1 2 3 4 5 6 8 10 12 15 16 20...

Page 119: ...cter format ESC Data Rate Example 2400 baud at 64 kbps Faults and Alarms Satellite Backward Alarm 1 per IESS 309 Receive BWA Output Enabled onto terrestrial secondary alarm 9 3 1 D I Primary Data Interfaces When configured for D I operation multiplexing demultiplexing follows the IBS satellite frame structure and ESC features but with the following changes Accepts and outputs primary data through ...

Page 120: ...nge 6 to 8 dB 2 dB steps Audio Output Level Adjustment range 6 to 8 dB 2 dB steps Audio Filtering Internal 300 to 3400 Hz input and output ESC Data Interface Type RS 422 ESC Data Rate 8 kbps also 64 kbps if ADPCM audio is not used ESC Data Circuits Supported SD ST RD RT Octet in Octet out Data Signal Phasing Per EIA 449 data changes on the rising clock transition is sampled on the falling clock ed...

Page 121: ...Performs the corresponding demultiplexing of Rx satellite data received from the demodulator portion of the modem Resulting G 703 data is optionally encoded AMI B8ZS or HDB3 before being output 9 4 2 IDR Engineering Service Channel Bi directional processing of the components of the ESC channel including the ADPCM audio channels 8 kbps data channel and fault indications specified by IESS 403 and IE...

Page 122: ...CDM 600L Satellite Modem Revision 0 Open Network Operations MN CDM600L IOM 9 6 This page is intentionally blank ...

Page 123: ...ecomes more complex 10 1 Transmit Clocking There are five transmit clocking modes in the CDM 600L RS 422 449 signal mnemonics will be used for illustration but the description applies equally to V 35 and synchronous RS 232 10 1 1 Internal Clock In this mode the modem assumed always to be the DCE supplies the clock to the DTE The RS 422 449 name for this signal is Send Timing or ST The DTE then clo...

Page 124: ...his source and gives the modem transmit data Send Data or SD synchronous with this clock It is optional whether the DTE also returns the clock Terminal Timing or TT the modem can accept if it is present but uses ST if it is not If the demodulator loses lock the modem s internal clock will be substituted so an accurate and stable clock is present on ST rather than a clock that may jitter and wander...

Page 125: ...irectly from the demodulator and hence will be subject to plesiochronous and Doppler offsets In certain instances this may be acceptable There is still a minimum buffer in use to de jitter the effects of removing overhead framing Note G 703 Applicable 10 2 2 Buffer Enabled TX RX TX Terrestrial or External Reference In this instance it is required that buffer be enabled so that the clock and data a...

Page 126: ...CDM 600L Satellite Modem Revision 0 Clock Modes and Drop and Insert D I MN CDM600L IOM 10 4 Figure 10 1 Tx Clock Modes ...

Page 127: ...CDM 600L Satellite Modem Revision 0 Clock Modes and Drop and Insert D I MN CDM600L IOM 10 5 Figure 10 2 Rx Clock Modes ...

Page 128: ... 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 E1 CCS Common Channel Signalling 2048 kbps E1 Frame Maximum channels to drop 30 1920 kbps n x 64 kbps n 1 2 3 4...

Page 129: ...slot TS from 1 to 24 The user may also select N A to leave a satellite channel unused The configuration menu allows time slots to be selected for transmission or reception up to the maximum dictated by the selected transmit or receive data rate and may be selected in arbitrary order As an example if the data rate is set to 256 kbps the maximum number of time slots that can be dropped or inserted i...

Page 130: ...e timeslots are dropped from an incoming E1 T1 signal for transmission over the satellite and the same E1 T1 signal has time slots re inserted into it that will over write data in existing timeslots 10 8 Rx Buffer Clock Insert D I only The E1 or T1 clock recovery from the IDI G 703 port serves as the Rx Buffer reference In addition the recovered data is the E1 T1 input to the Insert Mux If the Rx ...

Page 131: ...eater than 2 048 Mbps For example if the user s data rate is 64 kbps the actual transmission rate will now be at 67 2 kbps At the start of each frame a 12 bit synchronization word is added This allows the demodulator to find and lock to the start of frame At regular intervals throughout the frame additional data bytes and flag bits are added a further 36 bits in total It is these additional bytes ...

Page 132: ...amined to determine if they contain valid M C bytes 11 2 M C Connection Data to be transmitted to the distant end is sent to a local unit via the remote control port A message for the distant end is indistinguishable from a local message it has the same structure and content only the address will identify it as being for a distant end unit Before the M C data can be successfully transmitted and re...

Page 133: ...nse will be around 5 seconds Note that when either of the BPSK Turbo rates are in use the overhead rate is reduced by a factor of three and therefore the response time will be around 15 seconds 11 3 Setup Summary To access a distant end unit Designate a Master Slave pair Master at the local end Slave at the distant end On the local end unit enable framing and EDMAC define the unit as MASTER then e...

Page 134: ...CDM 600L Satellite Modem Revision 0 EDMAC Channel MN CDM600L IOM 11 4 This page is intentionally blank ...

Page 135: ...peration must be used The remote modem constantly sends back information about the demodulator Eb No using reserved bytes in the overhead structure The local modem then compares this value of Eb No with a pre defined target value If the Remote Eb No is below the target the local modem will increase its output power and hence a closed loop feedback system is created over the satellite link A partic...

Page 136: ... At this point the user will be prompted to define four key parameters 12 2 1 Target Eb No This is value of Eb No that the user desires to keep constant at the remote modem If the Eb No exceeds this value the AUPC control will reduce the TX output power but will never drop below the nominal value set If the Eb No falls below this value the AUPC control will increase the TX output power but will ne...

Page 137: ...2 3 Compensation Rate As with any closed loop control system the loop parameters must be chosen to ensure stability at all times Several features have been incorporated to ensure that the AUPC system does overshoot or oscillate First the rate at which corrections to the output power can be made is fixed at once every 4 seconds This takes into account the round trip delay over the satellite link th...

Page 138: ...value 16 0 dB will be displayed As long as framing is enabled the value will still be available even though AUPC may be disabled Also displayed is the current value of Tx power increase If EDMAC framing is enabled but AUPC is disabled this will indicate 0 0 dB This value is also available via the remote control interface CAUTION Comtech EFData strongly cautions against the use of large values of p...

Page 139: ...ctors This is shown in Appendix A Comtech EF Data will distribute a free software utility that is designed to run under Windows 95 98 or Windows NT This utility program is called 600Flash exe and should be copied to the user s computer hard disk Along with this the user will receive the latest firmware file for example 600V106 ccc which the user should copy to the same sub directory folder The use...

Page 140: ... Comtech EF Data Customer Support WARNING The Remote Control port EIA 232 lines used for Flash upgrading are also connected to the Primary 25 pin data connector P3B and are used when 1 N Redundancy Switch is connected Please ensure that NOTHING is connected to P3B pins 4 21 and 22 if these pins are used the EIA 232 remote control port will not function and Flash upgrading will be impossible ...

Page 141: ...Rate 1 2 Q OQPSK Turbo and all other rates 2 048 Mbps RS Outer Codec Turbo Product Codec Low Rate optional Rate 5 16 BPSK Rate 21 44 BPSK Rate 3 4 QPSK OQPSK 8 PSK 16 QAM Turbo Product Codec High Rate optional Rate 5 16 BPSK not available at time of this release Rate 21 44 BPSK Rate 1 2 QPSK OQPSK exact Code Rate is actually 0 477 Rate 3 4 QPSK OQPSK 8 PSK 16 QAM Rate 7 8 QPSK OQPSK 8 PSK 16 QAM R...

Page 142: ... outer code transparent mode IBS parameters 219 201 outer code transparent mode IESS 310 parameters 200 180 outer code EDMAC modes Interleaver depth 4 or 8 Viterbi depending on mode Interleaver depth 8 Sequential 8 PSK TCM Rate 2 3 Trellis Per IESS 310 Turbo Product Codec Low Rate Optional plug in card Rate 3 4 QPSK OQPSK 8 PSK 16 QAM 2 dimensional Rate 21 44 BPSK 3 dimensional Rate 5 16 BPSK 3 di...

Page 143: ...locking Options Internal 1ppm or 0 02 ppm SCT External locking over a 100 ppm range TT Loop timing Rx satellite clock supports asymmetric operation Rx and Tx data rates do not need to be identical External Clock at transmit data rate External TX Carrier Off By TTL low signal or external contact closure hardware function automatically over rides processor BUC Supply Voltage Suppplied through Tx IF ...

Page 144: ...rrier is like modulated and 7 dBc relative to neighboring carrier 40 dBc with respect to receive signal Total carrier power within the symbol rate BW at 1 2 the desired carrier frequency 10 dBc relative to the desired carrier power 5 dBm maximum 20 dBm Input Connector Type F Female 75Ω Type N Female 50 Ω Input Return Loss 10 dB 55 50 45 40 35 30 25 20 15 10 5 0 0 00 0 10 0 20 0 30 0 40 0 50 0 60 0...

Page 145: ...ency Uncertainty Code Rate Mod Data Rate Tacq P t Tacq 5 6 QPSK 9 6 kbps 40 sec 95 5 16 BPSK 9 6 kbps 6 sec 95 21 44 BPSK 9 6 kbps 15 sec 95 Clock tracking range 100 ppm min LNB 10 MHz Reference On center conductor of L band input connector selectable ON OFF Level 3 3 dBm Source 1 Internal modem reference 2 External reference Performance For phase noise refer to L band modulator 10 MHz Frequency s...

Page 146: ...00 or 200 180 Outer Code BER with two adjacent carriers each 7 dB higher than the desired carrier For BER 10 5 BER 10 6 BER 10 7 Rate 1 2 B Q OQ Guaranteed Eb No typical value in parentheses 4 3 dB 4 0 dB 4 4 dB 4 1 dB 4 5 dB 4 2 dB Rate 3 4 Q OQ Guaranteed Eb No typical value in parentheses 5 6 dB 4 7 dB 5 8 dB 4 8 dB 6 0 dB 5 2 dB Rate 7 8 Q OQ Guaranteed Eb No typical value in parentheses 6 5 d...

Page 147: ...4 dB 4 1 dB 4 5 dB 4 2 dB Rate 7 8 8 PSK Guaranteed Eb No typical value in parentheses 7 0 dB 6 6 dB 7 1 dB 6 7 dB 7 2 dB 6 8 dB Rate 7 8 16 QAM Guaranteed Eb No typical value in parentheses 8 1 dB 7 7 dB 8 2 dB 7 8 dB 8 3 dB 7 9 dB TURBO PRODUCT CODEC Rate 0 95 8 PSK Rate 0 95 16 QAM BER With two adjacent carriers each 7 dB higher than the desired carrier For BER 10 6 BER 10 7 BER 10 8 Rate 0 95 ...

Page 148: ...sion 0 Summary of Specifications MN CDM600L IOM 14 8 Carrier Level vs Symbol Rate 100 0 90 0 80 0 70 0 60 0 50 0 40 0 30 0 20 0 10 0 0 0 1 10 100 1 000 10 000 100 000 Symbol Rate ksps Carrier Level dBm Minimum Maximum Sig Level xls ...

Page 149: ...ck RS 422 External Reference input IDR BWA Inputs RS 232 High Rate ESC data future upgrade 25 pin D sub male Modem Alarms Relay outputs Tx Rx unit faults Demodulator I Q test outputs constellation Demodulator Rx Signal Level output 0 to 2 5 volts External carrier off input 15 pin D sub male IDR BWA Outputs 4 backward alarm Form C relay outputs 15 pin D sub female Remote Control RS 232 or RS 485 mo...

Page 150: ...QPSK Sequential with R S 8 4 kbps to 2 048 Mbps Rate 2 3 8 PSK TCM 4 8 kbps to 20 0 Mbps Rate 2 3 8 PSK TCM with R S 4 8 kbps to 18 0 Mbps Rate 3 4 16 QAM Viterbi with R S 4 8 kbps to 18 0 Mbps Rate 3 4 16 QAM Viterbi with R S 4 8 kbps to 18 0 Mbps Rate 21 44 BPSK Turbo 4 8 kbps to 3 2 Mbps to 4 77 Mbps with High Rate Turbo card Rate 5 16 BPSK Turbo 4 8 kbps to 2 048 Mbps to 3 12Mbps with High Spe...

Page 151: ...TU V 35 Intelsat Proprietary scrambler Basic ITU V 35 Intelsat IESS 309 scrambler IESS 309 scrambler Notes 1 When Reed Solomon is Off 2 1 5 for Rates 5 16 21 44 BPSK Turbo Rate 1 2 QPSK OQPSK Turbo and all rates 2 Mbps 14 7 Miscellaneous Front panel Tactile keypad 6 keys Up Down Left Right Enter Clear Vacuum Fluorescent Display blue 2 lines of 40 characters Loopbacks Internal IF loopback RF loopba...

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Page 153: ... preferred Half duplex 2 wire RS 485 is possible but is not preferred In full duplex RS 485 communication there are two separate isolated independent differential mode twisted pairs each handling serial data in different directions It is assumed that there is a controller device a PC or dumb terminal which transmits data in a broadcast mode via one of the pairs Many target devices are connected to...

Page 154: ...the other direction on the other conductor 15 4 Basic Protocol Whether in RS 232 or RS 485 mode all data is transmitted as asynchronous serial characters suitable for transmission and reception by a UART In this case the asynchronous character formats include 7O2 7E2 and 8N1 The baud rate may vary between 1200 and 38 400 baud All data is transmitted in framed packets The controller is assumed to b...

Page 155: ...rn Line Feed ASCII code 13 10 2 characters Example 0654 RSW 32 CR LF Each of the components of the packet is now explained 15 5 1 Start Of Packet Controller to Target This is the character ASCII code 60 Target to Controller This is the character ASCII code 62 Because this is used to provide a reliable indication of the start of packet these two characters may not appear anywhere else within the bo...

Page 156: ...permitted values are ASCII code 61 ASCII code 63 They have these meanings The code controller to target is used as the assignment operator and is used to indicate that the parameter defined by the preceding byte should be set to the value of the argument s which follow it For example in a message from controller to target TFQ 0950 0000 would mean set the transmit frequency to 70 MHz The code contr...

Page 157: ...ote Control MN CDM600L IOM 15 5 First if the controller has sent a query code to a target for example TFQ meaning what s the Transmit frequency the target would respond with TFQ xxxx xxxx where xxxx xxxx represents the frequency in question ...

Page 158: ...ontroller is only used as follows If the controller sends an instruction code which the target does not recognize the target will acknowledge the message by echoing the invalid instruction followed by the character with Example XYZ The code target to controller is only used as follows If the controller sends a correctly formatted command BUT the modem is not in remote mode it will not allow reconf...

Page 159: ...CDM 600L Satellite Modem Revision 0 Remote Control MN CDM600L IOM 15 7 This page is intentionally left blank ...

Page 160: ... RS232 synchronous 3 Balanced G 703 4 Unbalanced G 703 5 Audio Data rate fixed at 64 kbps IBS EDMAC only 6 LVDS Example TIT 1 selects V 35 TIT TIT TIT TIT TIT TIT x see description of arguments Tx Framing Mode TFM 1 byte value of 0 thru 4 Command or Query Tx Framing mode where 0 Unframed 1 IBS 2 IDR 3 DROP 4 EDMAC If TFM 4 is selected Rx framing is driven to EDMAC to match Example TFM 0 selects Un...

Page 161: ...coding ON 1 Viterbi 2 Viterbi Reed Solomon 3 Sequential 4 Sequential Reed Solomon 5 TCM Trellis Code Modulation Forces TCR 3 2 3 6 TCM Reed Solomon Forces TCR 3 2 3 7 Turbo 8 None uncoded with differential encoding OFF Example TFT 1 which is Viterbi coding TFT TFT TFT TFT TFT TFT x see description of arguments Tx Modulation Type TMD 1 byte value of 0 thru 4 Command or Query Tx Modulation type wher...

Page 162: ... Data Rate TDR 9 bytes Command or Query Tx Data rate in kbps between 4 8 kbps and 20 Mbps Resolution 1 bps Example TDR 02047 999 which is 2047 999 kbps TDR TDR TDR TDR TDR TDR xxxxx xxx see description of arguments Tx Reed Solomon Encoding TRS 1 byte value of 0 to 3 Command or Query Tx RS encoding 0 Normal based on the Open Network framing mode selected 1 IESS 310 mode Available all framing modes ...

Page 163: ... is not allowed Response will be TPL The response to the query TPL will be the adjusted leveled value TPL TPL TPL TPL TPL TPL xx x see description of arguments AUPC Enable AUP 1 byte value of 0 or 1 Command or Query AUPC mode enable disable where 0 Disabled 1 Enabled Example AUP 1 Note EDMAC framing must be selected for the AUPC feature to work AUP AUP AUP AUP AUP AUP x see description of argument...

Page 164: ... increase in Tx power level in dB from the nominal setting due to the action of AUPC Responds x x if AUPC is disabled Example PLI 2 3 N A PLI PLI x x see description of arguments Tx Clock Source TCK 1 byte value 0 thru 3 Command or Query Tx Clock Source where 0 Internal 1 Tx Terrestrial 2 Rx Loop Timed 3 External Reference Example TCK 0 selects Internal TCK TCK TCK TCK TCK TCK x see description of...

Page 165: ...ue of 0 thru 4 Command or Query Tx Carrier State where 0 OFF due to front panel or remote control command 1 ON 2 RTI receive transmit inhibit 3 OFF due to ext H W Tx Carrier Off command not a valid argument when used as a command 4 Off due to BUC warm up delay not a valid argument in a command format Example TXO 1 Tx Carrier ON TXO TXO TXO TXO TXO TXO x see description of arguments Rx Frequency RF...

Page 166: ...BS 2 IDR 3 INSERT 4 EDMAC Not allowed as a command Example RFM 0 selects Unframed mode Start EDMAC framing using TFM RFM RFM RFM RFM RFM RFM x see description of arguments Rx FEC Type RFT 1 byte value of 0 thru 8 Command or Query Rx FEC Type where 0 None uncoded no FEC with differential encoding ON 1 Viterbi 2 Viterbi Reed Solomon 3 Sequential 4 Sequential Reed Solomon 5 TCM Trellis Code Modulatio...

Page 167: ... thru 7 Command or Query Rx FEC Code Rate where 0 Rate 1 2 1 Rate 3 4 2 Rate 7 8 3 Rate 2 3 8 PSK TCM only 4 Rate 1 1 Uncoded or No FEC 5 Rate 21 44 Turbo Only 6 Rate 5 16 Turbo Only 7 Rate 0 95 Turbo Only Depending on FEC type not all of these selections will be valid Example RCR 1 selects Rate 3 4 RCR RCR RCR RCR RCR RCR x see description of arguments Rx Data Rate RDR 9 bytes Command or Query Rx...

Page 168: ...selects Normal RRS RRS RRS RRS RRS RRS x see description of arguments Rx Spectrum Invert RSI 1 byte value of 0 or 1 Command or Query Rx Spectrum Invert where 0 Normal 1 Rx Spectrum Invert Example RSI 0 selects Normal RSI RSI RSI RSI RSI RSI x see description of arguments Rx Descrambler RDS 1 byte value of 0 or 1 Command or Query Rx Descrambler state where 0 Off 1 On Example RDS 1 Scrambler On RDS ...

Page 169: ... for Balanced Example REF 10000 000U Selects 10MHz Unbalanced REF REF REF REF REF REF xxxxx xxxy see description of arguments Eb No Alarm Point EBA 4 bytes Command or Query Eb No alarm point in dB with a range between 0 1 and 16 dB Resolution 0 1 dB Example EBA 12 3 EBA EBA EBA EBA EBA EBA xx x see description of arguments Rx Buffer Size RBS 5 bytes Command or Query Rx Buffer Size 16 to 32768 byte...

Page 170: ... 4 External 10 MHz 5 External 20 MHz MRC MRC MRC MRC MRC MRC x see description of arguments EDMAC Framing Mode EFM 1 byte value of 0 or 1 Command or Query EDMAC mode where 0 EDMAC OFF Idle Mode 1 EDMAC ON Master Mode 2 EDMAC ON Slave Mode Query Only Example EFM 1 EDMAC Enabled as Master EFM EFM EFM EFM EFM EFM x see description of arguments EDMAC Slave Address Range ESA 4 bytes Command or Query ED...

Page 171: ...ask conditions in form abcdef where a Tx AIS 0 unmasked 1 masked b Rx AIS 0 unmasked 1 masked c bufferslip Alarm 0 unmasked 1 masked d spare e Rx AGC Alarm 0 unmasked 1 masked f Eb No Alarm 0 unmasked 1 masked Example MSK 010110 MSK MSK MSK MSK MSK MSK abcdef see description of arguments Receive Terrestrial Alarm Enable RTE 1 byte value of 0 or 1 Command or Query Insert parameter Receive Terrestri...

Page 172: ...ts Transmit Backward Alarms Enable TBA 4 bytes value of 0 thru 2 Command or Query Transmit Backward Alarm enable 0 Disable 1 Enable Internal S W 2 Enable External H W Position indicates backward alarm numbers 1234 Example TBA 0120 TBA TBA TBA TBA TBA TBA xxxx see description of arguments Receive Backward Alarms Enable RBA 4 bytes value of 0 or 1 Command or Query Receive Backward Alarm enable 0 Dis...

Page 173: ...ype same as RRS r Rx FEC Rate same as RCR m Rx Modulation Type same as RMD v Rx Spectrum Inversion same as RSI s Rx Scrambler state same as RDS ww Rx Sweep Width same as RSW c Rx Clock Source same as RCK tt t Eb No Alarm Point same as EBA bbbbb Rx Buffer Size same as RBS i Rx Interface Type same as RIT k Rx Ternary Code same as RTC n Rx Framing Mode same as RFM W Spare byte O Unit EDMAC Mode same ...

Page 174: ...ation from Configuration Memory location defined by the one byte argument 0 to 9 Example CLD 4 retrieve modem configuration from location 4 CLD CLD CLD CLD N A N A ReCenter Buffer RCB None Command only Forces the software to recenter the receive Plesiochronous Doppler buffer Note This command takes no arguments Example RCB RCB RCB RCB RCB N A N A RTC Date DAY 6 bytes Command or Query A date in the...

Page 175: ...format CR Sub body CR Sub body CR Sub body CR Sub body CR Sub body where Sub body ABCddmmyyhhmmss A being the fault clear indicator F Fault C Clear I Info B being the fault type where 1 Unit 2 Rx Traffic 3 Tx Traffic 4 Power on off or log cleared 5 Open Network C is Fault Code numbers as in FLT or Info Code which is 0 Power Off 1 Power On 2 Log Cleared 3 Global Config Change 4 Redundancy Config Ch...

Page 176: ...unread over the remote control Example NUS 247 N A NUS NUS xxx see description of arguments Retrieve next 5 unread Stored Statistics N A 130 bytes Query only Unit returns the oldest 5 Stored Statistics which have not yet been read over the remote control Reply format CR Sub body CR Sub body CR Sub body CR Sub body CR Sub body where Sub body AA ABB BC CD Dddmmyyhhmmss AA A Minimum Eb No during samp...

Page 177: ... EBN 016 N A EBN EBN xxxx see description of arguments Rx Signal Level N A 5 bytes Query Only Unit returns the value of the Rx signal level in dBm between 20 and 63 dBm in the form ccsxx where cc code GT Greater Than LT Less Than is equal to s is sign xx is Number Examples RSL LT 99 RSL 41 N A RSL RSL ccsxx see description of arguments Rx Frequency Offset N A 5 bytes Query only Unit returns the va...

Page 178: ...y State N A 1 byte value of 0 or 1 Query only Unit returns the redundancy state of the unit where 0 Offline 1 Online Example RED 1 which is Online N A RED RED x see description of arguments Local Remote Status LRS 1 byte value of 0 or 1 Command or Query Local Remote status where 0 Local 1 Remote Example LRS 1 which is Remote LRS LRS LRS LRS LRS LRS x see description of arguments Software Revision ...

Page 179: ...re N A 3 bytes Query only Unit returns the value of the internal temperature in the form of xxx degrees C Example TMP 26 N A TMP TMP xxx see description of arguments Equipment ID N A 10 bytes Query only Unit returns information concerning the equipment identification and the option field in the form abbbcdefgh where a Turbo option 0 None 1 Lo Rate Turbo 2 Hi Rate bbb defines the modem model number...

Page 180: ...ponse to Command Query Instruction Code and Qualifier Response to Query Drop Type DTY 1 byte value of 0 thru 3 Command or Query Drop Type where 0 T1 D4 1 T1 ESF 2 E1 CCS 3 E1 CAS DTY DTY DTY DTY DTY DTY x see description of arguments Insert Type ITY 1 byte value of 0 thru 3 Command or Query Insert Type where 0 T1 D4 1 T1 ESF 2 E1 CCS 3 E1 CAS ITY ITY ITY ITY ITY ITY x see description of arguments ...

Page 181: ...il C Modem card FPGA load D MUX FPGA load E Demux FPGA load b Tx Traffic status 0 Tx traffic OK 1 No clock from terrestrial interface 2 Tx FIFO slip 3 AIS detected on incoming data 4 AUPC upper limit reached 5 Ref PLL 6 BUC current 7 BUC voltage 8 BUC checksum 9 BUC PLL A BUC temperature c Rx Traffic status 0 Rx Traffic OK 1 Demodulator unlocked 2 AGC Alarm signal out of range 3 Demux 4 Spare 5 Bu...

Page 182: ...mple 123456789ABC0000000000003123456789ABC00000000000031 Drop channels 1 12 using timeslots 1 12 and unused channels 13 24 Same for Insert E1 CAS Drop and Insert directions Internal Loop ON If data rate equals 1920 kbps and DNI Type equals E1 CCS or E1 CAS then channels cannot be programmed The DNI query will display all x in the time slot positions DNI DNI DNI DNI DNI DNI n DNI ddddddddddddddd dd...

Page 183: ...LNB LNB LNB LNB LNB x see description of arguments LNB Reference enable LNR 1 byte value of 0 or 1 Command or Query 0 Disable LNB Reference 1 Enable LNB Reference LNR LNR LNR LNR LNR LNR x see description of arguments LNB Voltage LNV 1 byte value of 0 1 or 2 Command or Query 0 13V LNB Voltage 1 18V LNB Voltage 2 24V LNB Voltage LNV LNV LNV LNV LNV LNV x see description of arguments LNB Low current...

Page 184: ...ommand is only valid when the FSK and ODU power are turned On N A ODT ODT sxxx see description of arguments ODU phase Lock Loop N A 1 byte value of 0 or 1 Query only 0 Locked 1 Unlocked Note This command is only valid when the FSK and ODU power are turned On N A OLL OLL x see description of arguments ODU Software Version N A 2 bytes Query only Indicates the ODU software version in the form xx wher...

Page 185: ...ddress in the form xx where xx is between 0 and 15 Note This command is only valid when the FSK and ODU power are enabled N A OAD OAD xx see description of arguments ODU Output Power Enable OOP 1 byte value of 0 or 1 Command or Query Indicates ODU Power either 0 OFF or 1 ON Note This command is only valid when the FSK and ODU power are enabled N A OOP OOP x see description of arguments ODU Power L...

Page 186: ... see description of arguments ODU Carrier Output Delay OOD 5 bytes Command or Query Power up delay for the BUC to warm up prior to the TX Carrier On Where mm minutes 0 20 ss seconds 0 59 OOD OOD OOD OOD OOD OOD mm ss see description of arguments TX LO Frequency TLO 6 bytes Command or Query BUC transmit LO frequency information in the form xxxxxs where xxxxx is the LO frequency in the range of 3000...

Page 187: ... Tx Output Power Enable c ODU Power Leveling Enable d ODU Power Supply State e ODU 10MHz Reference State mm ss ODU Carrier Output Delay gggg ODU Low Alarm Limit hhhh ODU High Alarm Limit pp p Output Target Power i LNBVoltage j LNB Power State k LNB 10MHz Reference lll LNB Low Alarm Limit nnn LNB High Alarm Limit FFFFFS TX LO Frequency Fffffs RX LO Frequency xxxxxx Spare Bytes Any unavailable param...

Page 188: ...0L IOM 15 36 Note The following codes are used in the Response to Command column Message ok Received ok but invalid arguments found Message ok but not permitted in current mode Message ok but unit is not in Remote mode Time out of an EDMAC pass through message ...

Page 189: ...s and to query the BUC for configuration or status information FSK Transmitter Frequency 650 kHz 5 FSK Deviation 60 kHz nominal 60 kHz mark Deviation Tolerance 50 kHz minimum 70 kHz maximum Output Level 5 to 15 dBm Start Tone Time 10 ms minimum Output Impedance 50Ω Start Tone 710 kHz FSK Receiver Locking Range Input Sensitivity 32 5 kHz 15 dBm 50Ω Transmission Protocol Baud Rate Data Bits Parity S...

Page 190: ...is available via the M C for power level monitoring and AGC Refer to BUC manufacturer specifications for reported power accuracy 16 1 1 Transmission Interface Each transmitted data packet consists of 7 bytes of information The BUC only accepts a command if the first data byte contains the appropriate address Commands are only executed if the checksum coincides but a status response is sent if the ...

Page 191: ...2 Checksum error Bit 3 TX Status Bits 4 thru 7 Power Class 1 OOR 0 Normal 1 OOL 0 Normal 1 error in command message 0 Normal 1 TX ON 0 TX Off 0x1 to 0xf 6 Status Byte 2 Bits 0 3 Not used Bits 4 7 Software version 0xAA 0x0 to 0xf 7 Checksum Algebraic sum of bytes 1 6 Data Field Definitions TX Power Level Unsigned integer in 1 100 dBm Carrier Frequency Unsigned integer in MHz Termperature Signed cha...

Page 192: ...lict directly with each other Therefore BUC output power leveling cannot be turned ON if AUPC is ON and vice versa Further BUC output power leveling cannot be turned ON if the BUC output is turned off by FSK command or if the BUC PLL is faulted In these cases there is no carrier output from the BUC so a valid tracking level cannot be established Once leveling loop operation is established however ...

Page 193: ...me this menu is entered the displayed transmit output power level is updated with the current value set by the leveling loop BUC FSK related parameters including leveling ON OFF state and target tracking level are stored in nonvolatile memory like all other modem parameters that determine the set up state If FSK is turned ON the modem M C will set up FSK in the ON state if modem power is cycled OF...

Page 194: ...CDM 600L Satellite Modem Revision 0 BUC FSK Communications MN CDM600L IOM 16 6 This page is intentionally left blank ...

Page 195: ... LNB power may be present at the modem transmit and receive IF connectors Protect spectrum analyzers and other equipment sensitive to DC voltage with a DC block such as Weinshel Model 7003 to prevent accidental damage 17 1 1 Prior to Turning On Power Note Ensure DST system is installed properly and all connections all secure except the L Band TX and RX IF connectors which are initially disconnecte...

Page 196: ... and RX cables from the modem Not Applicable NA 4 Connect prime power to the modem NA 5 Allow modem to complete initialization NA 6 BUC Power OFF BUC 7 Modem Transmitter ON Transmitter ON Green LED at front panel LED is On Configuration TX TX IF 8 LNB Power OFF LNB 9 IF Loopback ON Test Mode LED turns ON This forces the receive parameters to match the transmit parameters TEST 10 Verify the carrier...

Page 197: ...ating Frequency MIX when LO Satellite Operating Frequency Whenever MIX the spectrum of the carrier is inverted The CDM 600L easily corrects for this with the Invert ON OFF selection located under the Configuration TX TX IF and Configuration RX RX IF menus Match the Tx inversion to the MIX in the BUC and the Rx inversion to the MIX in the LNB using the following Spectrum Normal when MIX Spectrum In...

Page 198: ... with the ODU 4 Initially set LNB and BUC current wide enough to avoid false reports during installation Readjust the limit at a later time 5 For FSK operation with an FSK capable BUC see the Chapters 6 and 16 Complete steps 13 through 29 prior to continuing The conditions for the BUC to function are Proper TX L Band power to the BUC from modem Sufficient and correct DC power at the BUC 10 MHz ref...

Page 199: ...e BUC LO Satellite Frequency Mix if the BUC LO Satellite Frequency BUC More Consult BUC manufacturer s LO specifications 19 Set Tx Spectrum Invert ON if MIX is Configuration Tx Tx IF 20 Program the satellite frequency under the TX Terminal Frequency menu Configuration Tx Tx IF 21 Set the TX Power Level to a safe low value Configuration Tx Tx IF 22 Turn TX carrier to Off Configuration Tx Tx IF 23 C...

Page 200: ...s for LO 32 Set Demod Spectrum Invert ON if LNB mix is Configuration Rx Rx IF 33 Program the satellite frequency under the Rx Terminal Frequency menu Configuration Rx Rx IF 34 Select 10 MHz Ref ON if LNB is external reference unit LNB 35 Program LNB Voltage to the correct value 13 18 or 24 VDC LNB 36 LNB Voltage OFF LNB 37 Connect LNB 38 Program LNB Power ON LNB 39 Record the nominal LNB current a...

Page 201: ... Clock Modes and Drop and Insert D I 10 1 Command Message Structure 16 3 Comparison of all TPC Modes 7 8 Compatibility 1 6 Compensation Rate 12 3 Config 6 6 Config All 6 7 Config Clocks 6 16 Config Clocks External Clock 6 19 Config Clocks Rx Buffer Clock 6 18 Config Clocks Rx Buffer Clock Center 6 18 Config Clocks Tx Clock 6 17 Config Drop Insert 6 19 Config Drop Insert Drop Channel Timeslots 6 20...

Page 202: ...ata Rate Ranges 14 10 Demod Unlock 12 3 Demodulator 14 4 Description 56 1 Dimensional Envelope 4 6 Drop and Insert 9 2 10 6 Drop and Insert Clocking 10 7 E Eb No Measurement B 1 EDMAC Channel 11 1 End of Packet 15 5 End to End Processing Delay 7 7 Enter Access Codes C 2 External Clock 10 2 F FAST 6 40 FAST Set 6 40 FAST View 6 40 FAST Accessible Options 1 5 FAST Activation Procedure C 1 FAST Optio...

Page 203: ...Physical Description 4 1 Power Class 16 3 Prior to Turning On Power 17 1 R Rear Panel 4 2 Receive Clocking 10 3 Reed Solomon Outer Codec 7 3 Remote Control 15 1 Remote Control Interface Connector P5A 5 5 Response Message Structure 16 3 RS 232 15 2 RS 485 15 1 Rx Buffer Clock Insert 10 8 Rx Loop Timed Rx Tx 10 2 Rx Loop Timed Rx Tx 10 2 S Select Internal IF loop 2 4 Sequential 7 2 Serial Number C 1...

Page 204: ...CDM 600L Satellite Modem Revision 0 Index MN CDM600L IOM i 4 Utilities Set RTC 6 37 V View Currently Installed Features C 2 Viterbi 7 1 Verification 1 3 X X 21 Notes 10 3 ...

Page 205: ...x 103 1 609 x 103 1 609 1 mm 0 03937 1 kilometer 0 621 Temperature Conversions Units of Weight Unit Gram Ounce Avoirdupois Ounce Troy Pound Avoir Pound Troy Kilogram 1 gram 0 03527 0 03215 0 002205 0 002679 0 001 1 oz avoir 28 35 0 9115 0 0625 0 07595 0 02835 1 oz troy 31 10 1 097 0 06857 0 08333 0 03110 1 lb avoir 453 6 16 0 14 58 1 215 0 4536 1 lb Troy 373 2 13 17 12 0 0 8229 0 3732 1 kilogram 1...

Page 206: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX ...

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