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Theory of Operation

SDM-300A Satellite Modem

4–8

Rev. 4

4.3 Demodulator

A block diagram of the demodulator is shown in Figure 4-3.

The demodulator converts PSK modulated carriers within the 50 to 180 MHz range to a
demodulated baseband data stream. The converted modulation types are BPSK, QPSK,
OQPSK, and 8PSK (refer to Section 4.2.3 for a description of modulation types). The
demodulator then performs FEC on the data stream using Viterbi or Sequential decoding
algorithms.

D IG ITA L

S IG N A L

P R O C E S S IN G

D IG ITA L

C LO C K

R E C O V E RY -

LO O P

S W IT C H

R E F

V C X O

R E F

P LL

O C X O

O P T

H IG H

S TA B ILITY

A G C

LP F

B P F

L O # 2

LO O P B A C K

R F IN P U T

R F IN P U T

5 0 TO 18 0 M H z

B P F

A TO D

C O N V E R T E R

LO # 1

R E FE R E N C E

V ITE R B I

D E C O D E R

S E Q U E N T IA L

D E C O D E R

O P TIO N A L

R E E D -S O L O M O N

C O D E C

D O P P LE R /

P LE S IO C H R O N O U S

B U F FE R

M U X

IN TE R FA C E

O P TIO N A L

O V E R H E A D D E F R A M IN G

IB S /ID R , A S Y N C /A U P C

D R O P & IN S E R T

E X T R E FE R E N C E

Figure 4-3. Demodulator Block Diagram

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Содержание SDM-300A

Страница 1: ...Part Number MN SDM300A IOM Revision 4 SDM 300A Satellite Modem Installation and Operation Manual...

Страница 2: ...n the USA Comtech EFData 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 SDM 300A Satellite Modem Installation and Operation Manual Part Number MN SDM300A IOM Revision 0 Jun...

Страница 3: ...t Department at service comtechefdata com Contact us via the web at www comtechefdata com To return a Comtech EFData product in warranty and out of warranty for repair or replacement 1 Request a Retur...

Страница 4: ...European EMC Directive xvi Warranty Policy xvii Limitations of Warranty xvii Exclusive Remedies xvii Disclaimer xvii CHAPTER 1 INTRODUCTION 1 1 1 1 Overview 1 2 1 1 1 Additional Features 1 3 1 1 2 Mod...

Страница 5: ...nector and Pinouts J10 2 19 2 3 6 RF Output Connector CP1 2 19 2 3 7 RF Input Connector CP2 2 19 2 3 8 External Reference CP3 2 20 2 3 9 Power Entry 2 20 2 3 9 1 AC Power Connector 2 20 2 3 9 2 48VDC...

Страница 6: ...ation 3 79 3 4 2 4 ASYNC AUPC Operation 3 80 3 4 2 5 EFD Closed Network Operation 3 81 3 4 2 6 Custom Operation 3 82 3 4 2 7 SDM 100 Emulation Operation 3 83 3 4 2 8 SDM 6000 Emulation Operation 3 84...

Страница 7: ...out 5 3 5 1 3 Demodulator Checkout 5 6 5 2 Fault Isolation 5 8 5 2 1 System Faults Alarms 5 8 5 2 2 Faults Alarms Display 5 12 5 2 3 Faults Alarms Analysis 5 12 5 2 3 1 Modulator Faults 5 13 5 2 3 2 D...

Страница 8: ...4 5 4 Configuration 4 Local EIA 485 4 Wire to Remote EIA 232 A 33 A 1 4 5 5 Configuration 5 Local EIA 485 4 Wire to Remote EIA 485 4 Wire A 34 A 1 4 5 6 Configuration 6 Local EIA 485 4 Wire to Remote...

Страница 9: ...mands B 7 B 3 3 Interface Configuration Commands B 9 B 3 4 System Configuration Commands B 15 B 3 5 Automatic Uplink Power Control AUPC B 16 B 3 6 MUX PCB Configuration Commands MUX PCB Installed Only...

Страница 10: ...lomon Codec C 16 C 3 8 Demodulator Spectrum Rotation C 16 C 3 9 Receive Frequency IF C 16 C 3 10 Receive Input Power Desired Carrier C 16 C 3 11 Receive Input Power Composite C 16 C 3 12 IF Input Over...

Страница 11: ...C 42 C 7 2 2 V 35 Specification V 10 V 11 Specification Circuit Supported C 43 C 7 2 3 EIA 449 EIA 422 Mil 188 114A Specification C 44 C 7 2 4 G 703 Optional with Overhead Card C 44 C 8 Asynchronous O...

Страница 12: ...ad Option 50 Pin D Connector 2 5 Figure 2 6 8 Channel 100 Pin MUX Connector 2 5 Figure 2 7 Data I O Connector J8 Removal Installation 2 17 Figure 3 1 Front Panel View 3 1 Figure 3 2 Keypad 3 3 Figure...

Страница 13: ...ote ASYNC Connection Diagram for Breakout Panel A 29 Figure A 8 Sequential Decoder Block Diagram A 41 Figure A 9 Viterbi Decoder Block Diagram A 43 Figure A 10 IDR Interface Block Diagram A 48 Figure...

Страница 14: ...s 3 80 Table 3 9 EFD Closed Network Parameter Settings 3 82 Table 3 10 SDM 100 Emulation Parameter Settings 3 83 Table 3 11 SDM 6000 Emulation Parameter Settings 3 84 Table 3 12 SDM 300A Revision Emul...

Страница 15: ...ormance Reference Tables C 18 Table C 7 Viterbi Decoder with Open Network BER Data C 19 Table C 8 Viterbi Decoder with Closed Network BER Data C 21 Table C 9 Viterbi Decoder with Reed Solomon C 23 Tab...

Страница 16: ...to add TX and RX data stable conditions Added Doppler paragraph as C 13 About this Manual This manual provides installation and operation information for the Comtech EFData SDM 300A satellite modem T...

Страница 17: ...nversions Recommended Standard Designations Recommended Standard RS Designations have been superseded by the new designation of the Electronic Industries Association EIA References to the old designat...

Страница 18: ...cifically these cables must be shielded from end to end ensuring a continuous ground shield The following information is applicable for the European Low Voltage Directive EN60950 HAR Type of power cor...

Страница 19: ...ranty is expressed or implied Comtech EFData specifically disclaims the implied warranties of merchantability and fitness for particular purpose Exclusive Remedies The remedies provided herein are the...

Страница 20: ...Rev 4 1 1 1Chapter 1 INTRODUCTION This chapter provides an overview of the SDM 300A satellite modem referred to in this manual as the modem Figure 1 1 Figure 1 1 SDM 300A...

Страница 21: ...rk satellite communication system The modem modulator provides the following functions Performs filtered BPSK QPSK OQPSK and 8PSK modulation onto a variable frequency amplitude carrier Encode the data...

Страница 22: ...SLRC refer to Section 3 2 1 5 Selectable near or far end baseband or interface loopback with any overhead option enabled 1 1 2 Modes of Operation The following main modes of operation are supported AS...

Страница 23: ...onitoring AUPC function is not available ASYNC AUPC interface is selected as the modem type The modem interfaces between the channel unit or multiplexer MUX and Intermediate Frequency IF converter equ...

Страница 24: ...ar design Figure 1 2 and consists of from two to five Printed Circuit Boards PCBs depending on the configuration The modem consists of two major replaceable assemblies as follows Rear panel main PCB a...

Страница 25: ...UB 300 breakout panel BOP is an option for Flex Mux only M C AUX CIRCU ITS SAT CLK FAULT RELAYS ALARM RELAYS 5 TO 20 DBM O PTIO N SDM 300A SATELLITE M ODEM BOP UB 300 CUSTOM ER DATA I O AUX 1 TTL FAU...

Страница 26: ...lomon Codec Concatenates with Viterbi or Sequential 8PSK 2 3 rate IESS 310 Requires Viterbi and Reed Solomon Codec 8PSK 2 3 rate EFD Mode Requires Viterbi Codec Asynchronous Interface Includes automat...

Страница 27: ...Platform SDM 300A X X Note 1 X Note 1 FAST Options X X X X X X FAST Options with Reed Solomon Hardware FAST Options with Overhead Hardware FAST Options with Reed Solomon and Overhead Hardware Mux Fle...

Страница 28: ...lity Reference Oscillator High power version 5 to 20 dBm Offset Quadrature Phase Shift Keying OQPSK 1 2 2 2 Factory or User Installed Options Consult an EFData Customer Support representative for mode...

Страница 29: ...versal Breakout Panel Installation and Operation Manual 1 2 3 2 UB 530 Breakout Panel Alternate Part for UB 300 The UB 530 functions ths same as UB 300 except the UB 530 is the 25DB Data I O For more...

Страница 30: ...l x PL 6095 15 Module 48 VDC 5 output 75 H S optional x PL 6095 16 Module 48 VDC 5 output 75 H S optional x PL 6095 17 Module 48 VDC 5 output 50 H S optional x PL 6095 18 Module 48 VDC 5 output 50 H S...

Страница 31: ...Introduction SDM 300A Satellite Modem 1 12 Rev 4 1 4 Typical Spectral Occupancy Figure 1 4 shows a typical spectral occupancy curve using the EFData filter mask Figure 1 4 Typical Spectral Occupancy...

Страница 32: ...3 1 5 Dimensional Envelope Refer to Figure 1 5 for the unit s dimensional envelope Note Dimensions are listed in inches and centimeters are in parenthesis 1 75 4 4 19 0 4 8 1 25 3 2 14 0 36 3 0 8 3 62...

Страница 33: ...Introduction SDM 300A Satellite Modem 1 14 Rev 4 This page is intentionally left blank...

Страница 34: ...foam spacing for maximum shipping protection CAUTION Do not use any cutting tool that will extend more than 1 inch into the container This can cause damage to the modem Unpack the modem as follows 1...

Страница 35: ...modem chassis into the equipment rack and slide the screw with flat washer through the slot of the mounting bracket Tighten the screw sufficiently to allow the modem chassis to slide in the bracket 3...

Страница 36: ...SDM 300A Satellite Modem Installation Rev 4 2 3 Figure 2 1 Installation of the Mounting Bracket...

Страница 37: ...ble 2 1 Modem Rear Panel Connectors Name Ref Desig Connector Type Function TX IF OUTPUT CP1 BNC RF Output RX IF INPUT CP2 BNC RF Input EXTERNAL REF CP3 BNC Input REMOTE J6 9 pin D Remote Interface FAU...

Страница 38: ...TX IF OU TP UT Figure 2 3 V 35 34 Pin Winchester Connector J6 REMOTE ALARMS J10 FAULT J7 J9 AUX 1 EX REF RX IF INPUT CP3 CP1 CP2 TX IF OU TP UT Figure 2 4 EIA 422 449 37 Pin D Connector J6 REMOTE ALA...

Страница 39: ...er located away from the modem but attached via cable to the remote connector This DCE interface is user selectable for either EIA 232 or EIA 484 Refer to Appendix B for a description of the remote in...

Страница 40: ...crew locks are provided for mechanical security on the mating connector Refer to Table 2 3 for pinout information Table 2 3 Fault Connector and Pinouts J7 Pin Signal Function Name 1 Common equipment i...

Страница 41: ...PCB has been installed in the field 50 pin D that can be ordered with the basic modem but it does not include the Overhead Card This is used with breakout panels and switches 37 pin D is an alternate...

Страница 42: ...CT B 13 CS B 14 SD B SD B 15 ST A ST SCT A 16 RD B RD B 17 RT A RXC SCR A 18 LL LL LL 19 RS B 20 MC A MC MC A 21 DF DF DF 22 DM B 23 MC B MC B 24 TT A TXC SCTE A 25 MF MF MF Note Use the MASTER clock...

Страница 43: ...EE f FF h HH j JJ k KK l LL have no connection The modem is available with a Winchester V 35 as the data I O connector PL 6032 There is a jumper on the unit that either opens or closes the CC line Th...

Страница 44: ...B 23 ST B 24 RD B 25 RS B 26 RT B 27 CS B 29 DM B 31 RR B 34 MC B 35 TT B There are jumpers on the PL 6031 EIA 422 interface Place the jumpers on the center pin and the pin towards the Master Clock MC...

Страница 45: ...ut 24 EIA 422 8k RClkB Out V 35 EIA 422 RT B Out V 35 EIA 422 RT B Out 25 BWO1_NC ESC TCLK Out EIA 232 26 BWO2_NC ESC RCLK Out EIA 232 27 BWO3_NC PRIMARY_NC PRIMARY_NC 28 BWO4_NC SECONDARY_NC SECONDAR...

Страница 46: ...used in a redundant system d Relay contacts DF C and DF NO are named for faulted condition DF C connected to DF NO unless demodulator Demod fault 2 D I ASYNC interface connector pinouts a With regard...

Страница 47: ...tten with the assumption that the same configured connector will be reinstalled However the operator does have an option to install a different configured connector Refer to Table 2 8 for a matrix exp...

Страница 48: ...out rear panel to gain access to disconnect connector J8 c Disconnect connector J8 from the PCB d Remove the four screws securing connector J8 to the rear panel e Remove the connector J8 2 For Part No...

Страница 49: ...nector J8 unserviceable Misalignment can be the result b Connect connector J8 to the PCB c Secure connector J8 to the rear panel with four screws d Position the rear panel to mate with the chassis and...

Страница 50: ...SDM 300A Satellite Modem Installation Rev 4 2 17 For Ribbon Configured Connector For 50 Pin Connector with Overhead Interface Board Figure 2 7 Data I O Connector J8 Removal Installation...

Страница 51: ...OUT is a programmable voltage 0 to 10V for a receive signal level between 25 and 60 dBm AUX 1 connection is a 9 pin female D connector J9 located on the rear panel of the modem Screw locks are provide...

Страница 52: ...M 9 Alarm 3 is not faulted NC Alarm 1 Not used Alarm 2 TX Alarm 3 RX Refer to Chapter 5 for a discussion of monitored alarms To obtain a system summary alarm connect all the Form C contacts in paralle...

Страница 53: ...er to the modem Observe the following Input Power 55W maximum 40W typical Input Voltage 90 to 132 or 175 to 264 VAC Unit switches ranges automatically Connector Type I E C Fuse Protection 1A slo blo L...

Страница 54: ...1 Front Panel The modem front panel Figure 3 1 enables control of modem configuration parameters and displays the modem status SDM 300A SAT EL LITE MO DEM TRANSMIT RECEIVE TRANSMIT RECEIVE COMMON STO...

Страница 55: ...A fault condition exists in the transmit chain Receive Red A fault condition exists in the receive chain Common Red A common equipment fault condition exists Stored Yellow A fault has been logged and...

Страница 56: ...R Pressing CLEAR generally returns the display to the previous selection Left and Right Diamond Keys These keys are used to move to the next selection or to move the cursor functions Note Throughout t...

Страница 57: ...Operation SDM 300A Satellite Modem 3 4 Rev 4 This page is intentionally left blank...

Страница 58: ...From the Function Select menu select one of the functional categories Configuration Monitor Faults Alarms Stored Faults Alarms Remote AUPC ASYNC mode only Utility Press or to move from one selection t...

Страница 59: ...ions 2 EFData recommends that selection of the desired Modem Type be made prior to making any other setting This procedure is located in the Utility Modem Type menu 3 Menus or commands that are specif...

Страница 60: ...ITY SYSTEM Figure 3 20 UTILITY MODEM TYPE Figure 3 21 UTILITY FACTORY SETUP Figure 3 22 CONFIGURATION SAVE Figure 3 10 ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key FUNCT...

Страница 61: ...to 104 dBm user adjusted FUNCTION SELECT CONFIGURATION CONFIGURATION MODULATOR Key ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information SCRAMBLER ON OFF DIFFERENTIAL ENCODER ON OFF...

Страница 62: ...or Low Var Rate 512 kbit s Upon entry the current transmitter rate is displayed with the flashing cursor on the first character of the code rate on line 1 Line 2 displays the data rate Press or to mak...

Страница 63: ...put power level from Normal 5 to 30 dBm High Power 5 to 20 dBm high power An offset can be added through the Utility menu to remove losses or gains in the system Upon entry the current transmitter pow...

Страница 64: ...state before CW mode was invoked The transmitter is automatically turned off to prevent the possible swamping of other channels To turn the transmitter on use the IF Output function MODEM REFERENCE P...

Страница 65: ...s ON OFF RS DECODER ON OFF CORRECTION_OFF Reed Solomon only BER THRESHOLD SWEEP CENTER None 1 0 E X X 3 to 8 35 000 to 35 000 Hz SWEEP RANGE 0 to 70 000 Hz REACQUISITION 0 to 999 Seconds ACCESS TO SUB...

Страница 66: ...rrently defined variable data rate select RX V and press ENTER twice To change the rate using the variable rate selection press ENTER when RX V is displayed A flashing cursor is displayed on the first...

Страница 67: ...he BER threshold If the BER threshold set is exceeded a receive fault will be indicated by the modem status indicators BER threshold may be set from 1 0 E 3 to 1 0 E 8 or may be disabled by specifying...

Страница 68: ...off or off Upon entry the status of the Reed Solomon decoder is displayed Use or to select one of the following modes ON Enables the Reed Solomon decoder to provide data error corrections CORRECTION_O...

Страница 69: ...1 to 9 ms 0 BYPASS Yes No OFF ON TX CODING FORMAT AMI B8ZS HDB3 TX G 703 only RX CODING FORMAT AMI B8ZS HDB3 RX G 703 only TX DATA FAULT RX DATA FAULT NONE AIS DATA Overhead only NONE AIS DATA Overhe...

Страница 70: ...ST T1_S T1_EST_S FORMATS INSERT SAT T SLOT TERR ALL OTHER FORMATS RX D I only ASYNC TX BAUD BAUD RATES bit s 110 150 300 600 1200 2400 4800 9600 19200 38400 TX ASYNC only ASYNC RX BAUD ASYNC TX LENGTH...

Страница 71: ...clock phase to AUTO NORMAL or INVERT Upon entry the current setting of the TX clock phase is displayed Press or to make the selection When AUTO is selected the modem will automatically select NORMAL o...

Страница 72: ...size is displayed in seconds or bits Enter the Utility Interface menu to change the buffer units to seconds or bits If selecting seconds choose from 1 to 99 ms in increments of 1 ms or 0 Bypass If sel...

Страница 73: ...interface loopback block diagram Upon entry the status is displayed or to make the selection Press ENTER to execute the change Note This menu is only available when the overhead interface PCB or Reed...

Страница 74: ...able when the overhead interface PCB is installed RX 2047 PATTERN Test Mode Configuration Programs the modem to receive a 2047 pattern as the normal receive data and allows the BER monitor to work on...

Страница 75: ..._CAS E1 Channel Associated Signaling E1_CCS E1 Common Channel Signaling E1_31_TS E1 No Multiframe Sync Alignment T1 T1 Data T1_S Special Signalling T1_ESF T1 Extended Super Frame T1_ESF_S Special Sign...

Страница 76: ...o the following desired terrestrial frame slot INSERT SAT CHANNEL TERR INSERT SAT T SLOT TERR Note The number of satellite channels is data rate dependent The number of channels is DR 64 kbit s When t...

Страница 77: ...the RX ASYNC option ASYNC TX STOP Programs the ASYNC overhead transmit stop bits for 1 or 2 Upon entry the status of the ASYNC TX stop bits is displayed Press or to make the selection Press ENTER to...

Страница 78: ...SDM 300A Satellite Modem Operation Rev 4 3 25 This page is intentionally left blank...

Страница 79: ...n 0 5 dBm steps 3 2 to 16 0 dB In 0 1 dB steps 0 5 to 6 0 dBm min In 0 5 dBm min steps HOLD NOMINAL MAXIMUM 5 0 to 30 0 dBm In 0 5 dBm steps 5 0 to 30 0 dBm In 0 5 dBm steps HOLD NOMINAL MAXIMUM ACCES...

Страница 80: ...try the current maximum power level is displayed Press or to increment or decrement the digit at the flashing cursor Press ENTER to execute the change TARGET NOISE Programs the Eb N0 target set point...

Страница 81: ...only TRIBUTARY n INTERFACE n 1 8 DISABLED 0 6 to 4000 kbit s in 100bit s steps EIA 232 EIA 422 ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information TRBUTARY n CLOCK DATA n 1 8 CLK N...

Страница 82: ...and or to increment or decrement the selected kbit s Press ENTER to execute the change TRIBUTARY CLOCK DATA Select the tributary 1 8 and program the clock phase to Normal Invert On entry the status i...

Страница 83: ...NC EIA 422 SYNC EIA 422 AUPC DISABLED TX CHAN 3 DR SYNC EIA 422 0 6 to 4000 0 kbit s All other modes 0 6 to 64 0 kbit s TX CHAN 3 PHASE CLOCK or DATA PHASE NORMAL INVERTED TX CHAN 4 MODE ASYNC EIA 232...

Страница 84: ...NC EIA 232 ASYNC EIA 485 AUPC DISABLED RX CHAN 4 DR 0 6 to 64 0 kbit s RX CHAN 4 PHASE NORMAL INVERTED C Key Figure 3 9 Configuration Flex Mux Continued Notes 1 The modulator data rate is status only...

Страница 85: ...cursor and or to increment or decrement the selected kbit s Press ENTER to execute the change TX CHAN 3 DR Programs the TX Channel 3 Drive SYNC EIA 422 0 6 to 4000 kbit s Press or to move the flashin...

Страница 86: ...decrement the selected kbit s Press ENTER to execute the change RX CHAN 3 DR Programs the TX Channel 3 Drive SYNC EIA 422 0 6 to 4000 kbit s Press or to move the flashing cursor and or to increment or...

Страница 87: ...3 4 OR 5 ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key Figure 3 10 Configuration Save Menu SDM300A TYPE VER X X X FUNCTION SELECT CONFIGURATION CONFIGURATION x x 1 2 3 4...

Страница 88: ...configuration setups that are used frequently After changing the configuration parameters to the desired settings enter the Configuration Save menu and select memory location 1 through 5 Press ENTER t...

Страница 89: ...ata Range 1 0 E 3 to 1 0 E 12 Current Eb NO No Data Range 2 0 to 16 0 dB Current Receive Signal 25 0 to 60 0 dBm Current Sweep Frequency 35 000 to 35 000 Hz No Data if carrier not locked Current Buffe...

Страница 90: ...it is 1 0 E 12 Eb N0 Displays the current Eb N0 or No Data if carrier is not locked Range 2 0 to 16 0 dB Note Low limit is based on the data rate High limit is 16 0 dB RECEIVE SIGNAL Displays the curr...

Страница 91: ...R BACKWARD ALARM BUFFER CLK PLL BUFFER CLK ACT DEMUX LOCK RX 2047 LOCK BUFFER FULL RX INSERT RX AUDIO 1 CLIP RX AUDIO 2 CLIP CONFIGURATION BATTERY CLOCK 12 VOLT SUPPLY 12 VOLT SUPPLY 5 VOLT SUPPLY SEL...

Страница 92: ...lts Alarms status in real time For each parameter monitored fault status is displayed as one of the following indicates that no fault or alarm exists indicates that a fault exists and will cause switc...

Страница 93: ...DEMOD Configuration menu MODULE Demodulator decoder module fault CONFIGURATION Demodulator decoder configuration fault 3 3 10 3 Transmit Interface Faults TX DROP Drop interface hardware fault Typical...

Страница 94: ...BER fault Indicates that the frame BER exceeds 1 3 BACKWARD ALARM Backward alarms BUFFER CLK PLL Buffer clock phase locked loop fault Indicates the buffer clock PLL is not locked BUFFER CLK ACT Activi...

Страница 95: ...DULE Interface module fault Typically indicates that the interface module is missing or will not program 3 3 10 6 Backward Alarms BW Alarm RX 4 Receive backward alarm 4 indicator BW Alarm RX 3 Receive...

Страница 96: ...SDM 300A Satellite Modem Operation Rev 4 3 43 This page is intentionally left blank...

Страница 97: ...IME DATE HH MM SS MM DD YY FAULT LABEL BUFFER UNDERFLOW BUFFER OVERFLOW RX DATA AIS FRAME BER BACKWARD ALARM BUFFER CLK PLL BUFFER CLK ACT DEMUX LOCK RX 2047 LOCK BUFFER FULL RX INSERT RX AUDIO 1 CLIP...

Страница 98: ...ate The power down and power up times are logged as common equipment fault 0 and common equipment fault 1 respectively On entering the stored faults level press or to move between the fault groups and...

Страница 99: ...status ASYNC option only ON OFF Control or last known status ASYNC option only ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key Figure 3 15 Remote AUPC Configuration Menu SD...

Страница 100: ...Press or to make the selection Press ENTER to execute the change Note This program is for control or last known status B BAND LOOP BACK Programs the remote baseband loopback on or off Upon entry the s...

Страница 101: ...Operation SDM 300A Satellite Modem 3 48 Rev 4 This page is intentionally left blank...

Страница 102: ...ypes Time Date Encoder Decoder Types Modem Types Current Firmware Test Mode Status Overhead Type Revision Emulation Lamp Test Provisions are also made for assigning data and code rates to the modulato...

Страница 103: ...dB steps Anything except 0 0 dB will cause ADJ to be displayed in the TX power level screen MODULATOR TYPE INTELSAT OPEN CSC CLOSED FDC CLOSED SDM51 COMPATIBLE EFD CLOSED ENCODER TYPE VITERBI SEQUENT...

Страница 104: ...iable data rate select TX V and press ENTER twice To change the rate using the variable rate selection press ENTER when TX V is displayed A flashing cursor is displayed on the first character of the c...

Страница 105: ...ress ENTER to execute the change MOD SPECTRUM Programmable vector rotation allows the operator to select NORMAL or INVERT for spectrum reversal of the I and Q baseband channels Press or to move the fl...

Страница 106: ...OPEN CSC CLOSED FDC CLOSED EFD CLOSED DECODER TYPE VITERBI SEQUENTIAL RX BPSK ORDERING STANDARD NON STANDARD DEMOD SPECTRUM RX RS INTERLEAVE 4 8 or 16 Deep RX IESS 310 ON OFF Used for 8PSK and Reed S...

Страница 107: ...line 2 Press or to select one of the predefined rates To select the currently defined variable data rate select RX V and press ENTER twice To change the rate using the variable rate selection press EN...

Страница 108: ...AL or INVERT for spectrum reversal of the I and Q baseband channels Press or to move the flashing cursor Press ENTER to execute the change RX RS INTERLEAVE Selection of 4 8 or 16 deep Press or to move...

Страница 109: ...5 G 703 G 703 only with overhead PCB installed BITS MILLI SECONDS ON OFF NONE IDR IBS DROP INSERT ASYNC Change in custom only RX TERR INTERFACE ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parame...

Страница 110: ...RX 1 ON OFF BW ALARM TX 4 ON OFF BW ALARM TX 3 ON OFF BW ALARM TX 2 ON OFF BW ALARM TX 1 ON OFF IDR only ASYNC RX TYPE RS 232 RS 485 RX ASYNC only ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Par...

Страница 111: ...ing type and structure of the data This function is used with the buffer program in ms for plesiochronous buffer slips Upon entry the framing type T1 or E1 is displayed on Line 1 The framing structure...

Страница 112: ...WIRE or EIA 485 2 WIRE for ASYNC overhead type EIA 485 2 wire requires tying TX and RX as one wire then tie TX and RX as the other wire Note Available only with ASYNC overhead option ASYNC RX TYPE Se...

Страница 113: ...ON DEPENDENT Parameter Information Key YEAR DISPLAY 2 DIGIT 4 DIGIT SELF TEST OFF AUTO RUN M C FIRMWARE FW NNNNNN DDR MM DD YY BOOT FIRMWARE FW NNNNNN DDR MM DD YY BOOT FIRMWARE VER X X X TEST MODE ST...

Страница 114: ...61 ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key EXT AGC MIN PWR 0 0 to 10 0 VOLTS in 0 5 v steps EXT AGC MAX PWR 0 0 to 10 0 VOLTS in 0 5 V steps MASTER RESET HARD SOFT...

Страница 115: ...em address is displayed 1 to 255 To change the remote address press ENTER Press or to make the selection Press ENTER to execute the change REMOTE TYPE Select EIA 485 2 Wire EIA 485 4 Wire or EIA 232 O...

Страница 116: ...60 minutes During this time period the operator is encouraged to implement the features and discover the capablilites of the different options After the 60 minute time limit the modem resets to its p...

Страница 117: ...et will reset the modem hardware but saves the current configuration settings Select ENTER once to access HARD or SOFT Press or to make the selection Press ENTER Press five times to move the cursor to...

Страница 118: ...SDM 300A Satellite Modem Operation Rev 4 3 65 This page is intentionally left blank...

Страница 119: ...6000 5 1 1 ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key CARD 2 TYPE REED SOLOMON 02 REED SOLOMON 03 INSTALLED CARD 1 TYPE OVERHEAD 01 MUX 01 FLEX MUX 01 NOT INSTALLED CA...

Страница 120: ...OFF TX or RX ASYNC installed MODEM SERIAL 123456789 CARD 1 SERIAL NO 123456789 Card 1 Installed Only CARD 2 SERIAL NO 123456789 Card 2 Installed Only REED SOLOMON 02 LIST INTELSAT F CARD 3 SERIAL NO...

Страница 121: ...ll not allow the modem type selection that type of operation may not be an available option Select MODEM OPTIONS and OVERHEAD OPTIONS to see which modem operations are allowed Refer to Section 3 2 1 f...

Страница 122: ...The revision emulation feature does not affect some interface changes for the direct operation of the modem Configuration save recall test mode screen in the Utility System all factory setup modes et...

Страница 123: ...tion code is displayed with the flashing cursor on the first character Press or to move the flashing cursor Press or to increment or decrement the digit at the flashing cursor Press ENTER to execute t...

Страница 124: ...P Factory Setting ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key Figure 3 22 Utility Factory Setup Menu 3 3 13 6 Utility Factory Setup Refer to Figure 3 22 CAUTION This co...

Страница 125: ...t mode will verify the satellite link without changing the programmed frequency of the demodulator When RF loopback is turned off the demodulator is programmed back to the previous frequency CUSTOMER...

Страница 126: ...will verify the customer equipment and cabling between the modem and the customer equipment The baseband loopback is not bi directional in D I CUSTOMER DATA IBS or IDR INTERFACE ENCODER MODULATOR TRA...

Страница 127: ...Sweep Range 60000 Hz Reacquisition 0 seconds RS Decoder Off Interface TX Clock Source TX Terrestrial RX Coding Format AMI TX Clock Phase Auto Channel Level TX RX 5 dBm EXT CLK Frequency 1544 kHz Drop...

Страница 128: ...bit s QPSK 1 2 TX Rate V 38 4 kbit s QPSK 1 2 RX Rate V 38 4 kbit s QPSK 1 2 MOD Power Offset 0 dB Demodulator Type INTERNAL Open Modulator Type INTELSAT Open Decoder Type Viterbi Encoder Type Viterbi...

Страница 129: ...em to the following types of operation Each type allows the user to operate the modem under the requirements of the configuration specifications listed below Table 3 3 Modem Types Configuration Specif...

Страница 130: ...te TX V QPSK 3 4 Configuration Modulator TX IF Output ON Configuration Demodulator RX Data Code Rate RX V QPSK 3 4 Configuration Demodulator TX Clock Source TX Terrestrial Internal Ext Reference Confi...

Страница 131: ...Menu Modem Type IBS Utility Modem Type TX Data Code Rate TX V QPSK 1 2 Configuration Modulator TX IF Output ON Configuration Demodulator RX Data Code Rate RX V QPSK 1 2 Configuration Demodulator TX C...

Страница 132: ...er Clock Source Insert Clock Configuration Interface TX Coding Format HDB3 Configuration Interface RX Coding Format HDB3 Configuration Interface Drop Format E1CCS E1CAS E1 Configuration Interface Inse...

Страница 133: ...BPSK 1 2 or QPSK 1 2 3 4 or 7 8 Configuration Demodulator Encoder Type Viterbi Sequential Utility Modulator Decoder Type Viterbi Sequential Utility Demodulator ASYNC TX Baud 110 to 38400 bit s Configu...

Страница 134: ...allows the SDM 300A to be compatible with any EFData closed network application The modem can be compatible with other closed network applications by selecting different modulator and demodulator typ...

Страница 135: ...y Interface Note To use G 703 the modem must have the required G 703 Overhead board PL 5305 1 installed 3 4 2 6 Custom Operation Note If the modem serves as the backup unit for a rack of modems having...

Страница 136: ...le 3 10 SDM 100 Emulation Parameter Settings Parameter Front Panel Settings Reference Menu Modem Emulation SDM 100 Utility Modem Type TX Data Code Rate TX V QPSK 1 2 Configuration Modulator TX IF Outp...

Страница 137: ...0 Emulation Parameter Settings Parameter Front Panel Setting Reference Menu Modem Emulation SDM 6000 Utility Modem Type TX Data Code Rate TX V QPSK 1 2 Configuration Modulator TX IF Output ON Configur...

Страница 138: ...ision Emulation Software Version Firmware Rev Description of Change 1 1 1 FW 6535 1 Original Issue 2 1 1 FW 6535 1 A Updated menus to reflect current application 3 1 1 FW 6535 1 B Added reflash capabi...

Страница 139: ...als The use of loop timing in the modem is an option for both EIA 422 and V 35 operation SCT LOOP SCT INTERNAL clock no longer applies when the modem has loop timing on The TX clock source is now reco...

Страница 140: ...The buffer clock will normally revert to the low stability internal reference automatically 3 5 4 IDR IBS G 703 Master Slave Use this application when the far end earth station does not have local ac...

Страница 141: ...LATOR HIGH STABILITY OSCILLATOR SATELLITE SATELLITE CLOCK REC OVERY CLOCK RECOVERY BUFFER BUFFER R D RD RT RT BUFFER CLOCK TX TERRESTRIAL BUFFER CLOCK TX TERR ESTRIAL MASTER BOP BOP DTS DTS EXT REF EX...

Страница 142: ...C ILLATION HIGH STABILITY OSCILLATION SATELLITE SATELLITE CLOCK REC OVERY DATA CLOC K BUFFER BUFFER RD RD RT RT BUFFER CLOCK TX TER RESTRIAL BUFFER CLOCK RX SATELLITE CLOCK MASTER BOP BOP DTS DTS EXT...

Страница 143: ...R SATELLITE SAT ELLITE CLOC K RECO VERY BU FFER DATA C LOC K RD BU FFER C LOC K TX TERRESTR IAL M ASTER BUFF ER CLOC K TX TER RESTRIAL C LO CK R ECOVERY BUFFER H IGH STABILITY O SC ILLATOR INTERN AL O...

Страница 144: ...LL IT E C L O C K R E C O V E R Y C L O C K R E C O V E R Y B U F F E R R D R D B U F F E R C L O C K T X T E R R E S T R IA L B U F F E R C L O C K R X S AT E L L IT E C L O C K M A S T E R B O P B O...

Страница 145: ...S E L E C T T E R R E S T R IA L E Q U IP M E N T S L AV E S ID E TH E M O D E M S E T T IN G S R E M A IN A S M A S T E R M A S T TH E U S E R E Q U IP M E N T W IL N E E D TO R E C O V E R T H E TI...

Страница 146: ...issimilar clocks If incoming traffic is too fast an occasional bit will be lost If incoming traffic is too slow an occasional bit will be repeated Doppler buffer of the signal of the satellite The Dop...

Страница 147: ...BIT 1 BIT 2 BIT 3 BIT 5 BIT 6 BIT 7 ERROR INTERFACE 1 INCOMING TRAFFIC TOO FAST BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 1 BIT 2 BIT 3 BIT 3 BIT 4 BIT 5 BIT 6 ERROR INTERFACE 2 INCOMING TRAFFIC TOO SL...

Страница 148: ...LIMITED TO PRODUCE A MORE INCLINED ORBIT THUS PROLONGING THE LIFE OF THE SATELLITE A SATELLITE IS MAINTAINED AT AN ASSIGNED GEOSTATIONARY LOCATION THROUGH THE USE OF GROUND COMMAND ADJUSTMENTS TO ITS...

Страница 149: ...ure 8 as the angle of inclination increases The orbit of the satellite can result in a peak to peak altitude variation of 2 85 km while the station keeping of a newly launched satellite will typically...

Страница 150: ...l up with data using the clock from the satellite and will empty using the local clock The object of the buffer is to ensure that the buffer overflows or underflows at regular determinable intervals t...

Страница 151: ...frame length of 256 bits with 16 frames per multiframe 4096 bits total or 2 ms 3 6 1 4 Multiples of the Frame Length If this setting is set to NONE the user can choose any buffer depth 3 6 1 5 Total...

Страница 152: ...es to other modems within the modem when necessary The modem configuration parameters are maintained in battery backed RAM which provides total recovery after power down situation The M C functions in...

Страница 153: ...onous Receiver Transmitter UART Digital to Analog Converter DAC Read Only Memory ROM Analog to Digital Converter ADC Read Access Memory RAM Universal ASYNC User Interface Fault and Alarm Relays MODEM...

Страница 154: ...ler checks the non volatile memory to see if valid data has been retained If valid data has been retained the modem is reconfigured to the parameters maintained by the RAM 2 If the non volatile memory...

Страница 155: ...lished remote communications protocol configure each modem for one address between 1 and 255 Each modem on a common remote communications link EIA 485 must have a distinct address Use the front panel...

Страница 156: ...K QPSK OQPSK 8PSK Refer to Section 4 2 3 for a description of each modulation type A block diagram of the modulator is shown in Figure 4 2 INTERFACE M UX OPTIONAL FRAMING UNIT IBS IDR ASYNC AUPC DROP...

Страница 157: ...states of the QPSK or OQPSK demodulator The data is sent to the convolutional encoder for encoding the baseband data The code rates 1 2 3 4 7 8 and 2 3 are based on the symbol rate range of 2 4 kbit s...

Страница 158: ...om the module The amplifier circuitry provides programmable control of the output level over a range of 5 to 30 dB in 0 1 dB steps The amplifier has power leveling of 0 5 dB to maintain the stability...

Страница 159: ...ption of modulation types The demodulator then performs FEC on the data stream using Viterbi or Sequential decoding algorithms DIGITAL SIGNAL PROCESSING DIGITAL CLOCK RECOVERY LOOP SWITCH REF VCXO REF...

Страница 160: ...the received signal The digital data is then sent to four separate circuits Automatic Gain Control Carrier Recovery Costas Loop Clock Recovery Loop Soft Decision Mapping The AGC provides a gain feedb...

Страница 161: ...onsists of a phase detector loop filter and DDS all implemented digitally The DDS performs the function of a VCO in an analog implementation The recovered data and symbol clocks are then used througho...

Страница 162: ...M 300A Sequential or Viterbi Decoder FAST options Sequential or Viterbi Decoder FAST options with Reed Solomon hardware Sequential or Viterbi Decoder FAST options with Overhead hardware Sequential or...

Страница 163: ...aces for the modem are defined by data communication standards MIL STD 188 EIA 449 EIA 232 or V 35 The interface receivers and drivers for these standards as well as the handshake signals for MIL STD...

Страница 164: ...CT E XT RECEIVERS D ATA DATA RX T ER R RX CLOC K R XC LK PLESIOCHRONOUS BUFFER PROCESSORS OVERHEAD DEMUX RX DATA R XSAT MUX SC T E XT TX CLK HI S TA B RX O V ER H EAD BA CKW ARD ALA RM S LINE LINE DR...

Страница 165: ...panel or remotely The startup buffer will overfill when centering to match the satellite frame to the terrestrial frame with a maximum slide of 0 5 ms The fill status is available as a monitor and is...

Страница 166: ...the DEMUX section may be optionally input to the buffer The front panel interface provides four clock selections clocking the data out of the buffer Internal Clock SCT RX Recovered Clock RXCLK Extern...

Страница 167: ...ponents will cause an interruption in service and fault the modem The outputs of the demodulator fault relay are available as follows Pins DF C and DF NO on the 50 pin D IDR interface connector J8 9 p...

Страница 168: ...backward alarms may be read through the EIA 232 or EIA 485 remote interface connector that is integrating a modem or switch into a computer network Refer to Appendix B for the remote interface specif...

Страница 169: ...Theory of Operation SDM 300A Satellite Modem 4 18 Rev 4 This page is intentionally left blank...

Страница 170: ...confidence that the modem is operational without installing external equipment A 2047 pattern is generated by the modem and routed through all sections This is accomplished by placing the modem in IF...

Страница 171: ...er 2 for external modem connections 2 Set up the modem for baseband loopback operation by using the Configuration Interface front panel menu Chapter 3 The modem will run error free Refer to Chapter 3...

Страница 172: ...d to the incoming signal the Monitor menu will display signal level raw BER corrected BER and Eb N0 Refer to Chapter 1 for examples of BER performance curves 5 Connect a spectrum analyzer to the modem...

Страница 173: ...5 9 5 9 5 7 8 9 5 7 1 10 5 10 1 10 1 10 1 8 3 10 1 7 7 11 0 10 6 10 6 10 6 8 9 10 6 8 2 11 5 11 2 11 2 11 2 9 4 11 2 8 8 12 0 11 7 11 7 11 7 10 0 11 7 9 3 12 5 12 2 12 2 12 2 10 5 12 2 9 8 13 0 12 8...

Страница 174: ...10 0 Hz SPAN 1 000 MHz ST 30 00 sec Modem Rate 2144 kbit s 3 4 Rate Coding with 7 8 dB Eb No S N N 10 dB Figure 5 2 Typical Output Spectrum with Noise ATTEN 10 dB 5 00 dB DIV CENTER FREQUENCY 140 000...

Страница 175: ...ke several seconds When the green carrier detect LED is on and the DEMUX lock fault has been cleared where applicable the modem will run at the specified error rate Run the TX power level input amplit...

Страница 176: ...SDM 300A Satellite Modem Maintenance Rev 4 5 7 WITH NOISE WITHOUT NOISE Figure 5 4 Typical Eye Constellations...

Страница 177: ...le problems and the appropriate action required to repair the modem If any of the troubleshooting procedures mentioned earlier in this chapter do not isolate the problem and Comtech EFData Customer Su...

Страница 178: ...X X X X X AGC X X X X X X MODEM REF ACT X X MODEM REF PLL X X X X X X DEMODULATOR FAULTS CARRIER DETECT X X X X X IF SYNTHESIZER X X X X X I CHANNEL X X X X X Q CHANNEL X X X X X BER THRESHOLD X X X...

Страница 179: ...ACE FAULTS BUFFER UNDERFLOW X X BUFFER OVERFLOW X X RX DATA AIS X X X X FRAME BER X X X X X BACKWARD ALARM X X X X BUFFER CLK PLL X X X X BUFFER CLK ACT X X X DEMUX LOCK X X X X X RX 2047 LOCK X X BUF...

Страница 180: ...X X X X SELF TEST X INTERFACE MODULE X X X X X BACKWARD ALARMS IDR OVERHEAD ONLY BW ALARM RX 4 X X X BW ALARM RX 3 X X X BW ALARM RX 2 X X X BW ALARM RX 1 X X X BW ALARM TX 4 X X BW ALARM TX 3 X X BW...

Страница 181: ...fault or stored fault indicated by a front panel LED could be one of many faults To determine which fault has occurred use the Fault or Stored Fault front panel menu Refer to Chapter 3 for information...

Страница 182: ...d A 1544 kbit s Rev 3 IDR is programmed to 1640 kbit s An IBS type would be programmed for the input data rate to the channel unit The modem accounts for the overhead because of the change in internal...

Страница 183: ...icates the demodulator IF synthesizer is faulted This fault is a hardware failure Contact the Comtech EFData Customer Support Department I CHANNEL Indicates a loss of activity in the I channel of the...

Страница 184: ...data AIS is monitoring a fault condition of all 1s or 0s This is referred to as a data stable condition data is not transitioning This fault indicates there is trouble in the chain sending data to the...

Страница 185: ...ata fault in the Interface Utility menu the RX data AIS is monitoring a fault condition of all 1s or 0s This is referred to as a data stable condition data is not transitioning The fault indicates tro...

Страница 186: ...d multiframe alignment The usual cause is invalid or absent receive data This is a major prompt alarm The alarm will cause insertion of receive AIS all 1s and the switch over will be attempted This fa...

Страница 187: ...m is first turned on 12 VOLT SUPPLY 12V power supply fault Indicates a high or low voltage condition Level is 5 Check for a short on the 12V line from the power supply or on any of the plug in boards...

Страница 188: ...rm 1 Refer to BW Alarm RX4 for details BW ALARM TX4 Transmit backward alarm 4 The modem is being instructed to send backward alarm 4 to the distant end of the link This alarm is controlled by wiring t...

Страница 189: ...Maintenance SDM 300A Satellite Modem 5 20 Rev 4 This page is intentionally left blank...

Страница 190: ...endix A A 1 FAST Accessible Options A 2 Conventional Options A 3 Software and Hardware Upgrades A 1 1 FAST Theory of Operation A 2 1 Reed Solomon Codec A 3 1 Overhead Interface A 1 2 Implementation A...

Страница 191: ...HARDWARE B asic Platform X X X X X X X X X X X X X Note 2 X Note 2 X Note 2 X Note 2 X Note 1 X Note 1 X Note 1 X Note 1 X Note 1 FA ST Options Fast Options w ith R eed Solom on H ardw are Mux Flex Mu...

Страница 192: ...he access code is loaded into the unit through the front panel keyboard or the rear remote port With the exclusive FAST technology operators have maximum flexibility for enabling functions as they are...

Страница 193: ...rned to the manufacturer for the desired hardware upgrade 2 If the unit displays an X the unit can be upgraded in the field 3 If the unit displays a the feature is installed 4 If the unit displays a t...

Страница 194: ...elect Utility Modem Type menu e Press ENTER f Use and to select Configuration Code Modem menu g Press ENTER h Menu appears as follows AAAAAAAAAA AAAAAAAAAA i Enter the access code Use the following ex...

Страница 195: ...dem Type menu e Press ENTER f Use and to select Modem Options menu g Press ENTER h Use and to scroll through features Visually check selected features for a sign If a sign is evident the upgrade is co...

Страница 196: ...u either from the front panel or remotely through the EIA 232 interface Selection of the transmit and receive data rates may be made in 64 kbit s increments and may be independent of each other The ac...

Страница 197: ...t Allowed 1 to 24 T1 1 to 31 E1 Arbitrary order Insert Time Slot Selection Time Slot 0 not Allowed 1 to 24 T1 1 to 31 E1 Arbitrary order Interface Type Transformer coupled symmetrical pair Terrestrial...

Страница 198: ...stored fault Engineering Service Channel ESC Data Interface Type EIA 232 ESC Data Rate Maximum Asynchronous 1 2000 of satellite data rate maximum over sampled ESC Data Circuits Supported SD RD DSR Fa...

Страница 199: ...O CHR O NO US BUFFER FRAM ING TIM ING DEFRA M E TIM ING LO G IC M UX D EM UX INTERFACE INTERFACE IN TERFACE INTERFACE IN TERFACE SYN THESIS SYNTHESIS ALARM M O NITO R ES TO E S ASYNC RS 232 T1 E1 T1 E...

Страница 200: ...SDM 300A Satellite Modem Options Rev 4 A 11 Figure A 2 D I with Asynchronous Overhead Data Flow...

Страница 201: ...be switched independently The zero substitution codes Alternate Mark Inversion AMI B8ZS and HDB3 are user selectable during configuration A data loopback function on the insert data is available in t...

Страница 202: ...ing the modem a green LED on the interface and sending the signal into the receive fault tree in accordance with IESS 308 Under certain fault conditions defined by IESS 308 the receive user data will...

Страница 203: ...t a rate of 1 512 of the data rate of the modem The synchronous channel requires use of the TX clock provided by the modem for operation A 1 3 2 6 Backward Alarm A backward alarm signal is included in...

Страница 204: ...ivided into T1 and E1 categories as follows T1_ESF T1 Extended Super Frame T1 T1 D4 Framing T1_ESF_S T1 Extended Super Frame Special T1_S T1 D4 Framing Special E1_CCS E1 Common Channel Signaling E1_CA...

Страница 205: ...Options SDM 300A Satellite Modem A 16 Rev 4 Figure A 3 E1 Framing Formats...

Страница 206: ...SDM 300A Satellite Modem Options Rev 4 A 17 Figure A 4 T1 Framing Formats...

Страница 207: ...ep Reacquisition 0 seconds Mod Spectrum Normal BER Threshold NONE Demod Spectrum Normal Interface TX Clock Source TX Terrestrial Buffer Size 1 mS Buffer Clock Source Insert Frame Structure T1 Data G 7...

Страница 208: ...ces are available for ASYNC channel input and output These interfaces can also be selected from the front panel Fixed 1 15 overhead is added to the data when an ASYNC channel is being used With the AS...

Страница 209: ...n Interface menu Figure A 5 ASYNC AUPC Block Diagram G 703 V 35 TERR D ATA TERR C LOCK IN PUT FIFO PLL IN TERFACE C NT SIGNALS AUPC DATA FROM M C TERR D ATA TERR OVERHEAD C LO CK INTER FACE CNT SIGNAL...

Страница 210: ...power LOCAL CL ACTION Defines action that local modem will take if it loses carrier Maximum Minimum or Hold REMOTE CL ACTION Defines action that local modem will take if remote modem reports carrier l...

Страница 211: ...C feature uses the overhead channel to control the modem s output power The operator can allow the modulator to control its own TX power when the earth station is in the same satellite footprint The o...

Страница 212: ...EIA 422 and V 35 The operator must select the terrestrial interface type from the front panel under the Utility Interface menu Once selected I O data is routed to and from the appropriate drivers and...

Страница 213: ...n the modem at the overhead rate A 1 4 3 4 DEMUX Operation The DEMUX section functions in a reverse manner to the MUX side Data including overhead is received from the Demod card in the modem at the o...

Страница 214: ...recovered clock from the demodulator IF input The SCT clock output will be phase locked to the RX Satellite clock when loop timing is selected The operator can use the clock developed from the RX Sate...

Страница 215: ...The 2 or 4 wire operation is selected via the front panel In the 2 wire mode the EIA 485 receivers are disabled whenever the data is to be transmitted down the 2 wire interface In the 4 wire mode the...

Страница 216: ...um baud rate is 38400 The following table lists examples If DR 8 000K Baud rate can be 150 or lower If DR 16 000K Baud rate can be 300 or lower If DR 32 000K Baud rate can be 600 or lower If DR 64 000...

Страница 217: ...ration parameters must be set for each type of configuration Industry standard cables must be used at both modems To implement remote ASYNC operation use the configuration information found in the app...

Страница 218: ...A 485 25 PIN CONNECTOR TO 9 PIN CONNECTOR INDUSTRY STANDARD C A 4 05 6 C A 4 05 6 LOCAL END REMOTE END BENCH TEST 50 PIN 50 PIN Figure A 6 Remote ASYNC Connection Diagram for Y Cable WYSE REMOTE TERMI...

Страница 219: ...s ASYNC TX and RX Parity Even ASYNC TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female A...

Страница 220: ...ASYNC TX and RX Parity Even ASYNC TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female AS...

Страница 221: ...th 7 bits ASYNC TX and RX Parity Even ASYNC TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin...

Страница 222: ...YNC TX and RX Parity Even ASYNC TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female ASYNC...

Страница 223: ...NC TX and RX Parity Even ASYNC TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female ASYNC...

Страница 224: ...bits ASYNC TX and RX Parity Even ASYNC TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin fema...

Страница 225: ...nu ASYNC TX and RX Baud Rate 150 to 38400 See A 1 4 3 10 ASYNC TX and RX Length 7 bits ASYNC TX and RX Parity Even ASYNC TX Stop 2 bits 7 Remote End Modem Settings for EIA 232 Utility Interface Menu A...

Страница 226: ...ion the following table lists the pinout for the WYSE terminal cable using an EIA 232 to EIA 485 converter 7 Local End WYSE Cable With Converter 25 Pin Male Connector 9 Pin Male Connector TX RX 2 5 5...

Страница 227: ...nu ASYNC TX and RX Baud Rate 150 to 38400 See A 1 4 3 10 ASYNC TX and RX Length 7 bits ASYNC TX and RX Parity Even ASYNC TX Stop 2 bits 8 Remote End Modem Settings for EIA 485 4 Wire Utility Interface...

Страница 228: ...ng table lists the pinout for the WYSE terminal cable using an EIA 232 to EIA 485 converter 8 Local End WYSE Cable With Converter 25 Pin Male Connector 9 Pin Male Connector TX RX 2 5 5 TX RX TX RX 14...

Страница 229: ...Power Fixed 0 dBm Demodulator Type EFD Closed Decoder Type Viterbi Demod Spectrum Normal Interface TX Clock Source TX Terrestrial Frame Structure E1 Data G 704 Buffer Clock Source RX Satellite Frame S...

Страница 230: ...diagram of the sequential decoder MICRO COMPUTER BUS MICROCOMPUTER INTERFACE SYNDROME SHIFT REGISTER A DESCRAMBLER V 35 RECEIVE DATA DECODER DETECTOR DIFFERENTIAL CHANNEL BER OUTPUT BUFFER PARITY GEN...

Страница 231: ...he decoder makes a wrong decision the cumulative metric will decrease rapidly as the error propagates through the taps of the parity generator In this case the decoder tries to back up through the dat...

Страница 232: ...the output data contains many fewer errors than the input differences in the two can be counted to yield the raw BER The raw BER is sent to the M C for further processing A 1 4 8 Viterbi Decoder The...

Страница 233: ...ussian noise The task of the decoder is to determine which symbols have been corrupted by the transmission channel and correct as many errors as possible The code symbols produced by the encoder provi...

Страница 234: ...maximum path metrics is used as the means of determining synchronization of the decoder The output data is then descrambled and differentially decoded Both of these processes are optional and may be...

Страница 235: ...o is a 600 transformer balanced input The ADPCM audio channels are encoded according to CCITT G 721 The backward alarms are level translated to TTL by threshold comparators set to 2 5V A 1K pull up re...

Страница 236: ...be ignored Implementation is straightforward in a simple single destination link INTELSAT specifies that any major failure of the downlink chain is to generate a backward alarm The modem has a demodul...

Страница 237: ...Options SDM 300A Satellite Modem A 48 Rev 4 Figure A 10 IDR Interface Block Diagram...

Страница 238: ...ernal 300 to 3400 Hz input and output ESC Data Interface Type EIA 422 ESC Data Rate 8 kbit s ESC Data Circuits Supported SD ST RD RT Octet in Octet out Data Signal Phasing Per EIA 449 data changes on...

Страница 239: ...k OFF Modulator Type INTELSAT Open Net RF Loopback OFF Encoder Type Viterbi Sweep Center Freq 0 Hz CW Mode Normal OFF Sweep Range 60000 Hz Mod Power Fixed 0 dB Sweep Reacquisition 0 seconds Mod Spectr...

Страница 240: ...m the demodulator is input through the same interface loopback device The receive data is demultiplexed and synchronously descrambled by the demultiplexer The backward alarm is reported to the M C and...

Страница 241: ...Options SDM 300A Satellite Modem A 52 Rev 4 Figure A 11 IBS Interface Block Diagram...

Страница 242: ...000 of the primary channel data rate Data rate is 1 512 of primary data if an EIA 232 clock is provided Octet Clock Pulse Data rate 8 Octet high with every 8th bit EIA 232 Specification Circuit Suppor...

Страница 243: ...ack OFF Modulator Type Intelsat Open Net RF Loopback OFF Encoder Type Viterbi Sweep Center Freq 0 Hz CW Mode Normal OFF Sweep Range 60000 Hz Mod Power Fixed 0 dB Sweep Reacquisition 0 seconds Mod Spec...

Страница 244: ...in the basic modem The asymmetrical clock loop reference must be one of the following Transmit terrestrial clock External clock input Receive clock input Notes 1 The clock inputs are as follows a 64 k...

Страница 245: ...DDS INT ST SCT INT DDS EXT REF See Note 2 ST SCT LOOP DDS EXT REF See Note 2 ST INT LOOP See Note 1 RXC PLL ST EXT CLOCK MC PLL ST Notes 1 When CONFIGURATION INTERFACE LOOP TIMING is set to ON SCT INT...

Страница 246: ...ram Example Master Slave Clocking Setup 1 Master site has a 10 MHz clock that is needed as the clock source 2 Unequal data rates 4 096 Mbit s and 2 152 Mbit s numbers divisible by 8 Master Site Option...

Страница 247: ...coexisting clock that is on a separate line for G 703 data The clock is derived from the data stream within the modem and in the user equipment Loop timing if desired must occur in the customer equip...

Страница 248: ...0 3 1 5V pk into 120 RD Amplitude T1 3V 0 3 1 5V pk into 100 E1 3V 0 3 1 5V pk into 120 Pulse Mask T1 G 703 2 E1 G 703 6 Jitter Attenuation T1 G 824 E1 G 823 Line Code AMI B8ZS B6ZS HDB3 A 1 8 Variab...

Страница 249: ...Solomon Codec The modem must have the Reed Solomon PCB installed to access this feature The Reed Solomon Codec PCB is a 4 75 x 6 00 12 07 x 15 24 cm daughter card that is located on the main PCB Figu...

Страница 250: ...MU X DATA MU X CLK INTERFACE PCB MUX CDR CLK DEC DATA OVERHEAD PR OCESSOR R X DATA LOOPBACK MUX DMX DATA DMX CLK RX CLK DEC CLK REED SOLOMON M AIN MAIN PCB Figure A 15 Reed Solomon Codec Block Diagra...

Страница 251: ...encoder section is shown in Figure A 16 The Reed Solomon encoder section includes the following circuits Synchronous Scrambler Reed Solomon Codec encoder section Serial Parallel Converter RAM Interle...

Страница 252: ...the total number of bytes in a given block of data out of the Codec The letter k represents the number of data bytes in a given block The term n k 2t is the total number of check bytes appended to the...

Страница 253: ...k B YTES OF DATA RSW ORD n BYTES 1 RSW ORD 1 RS PAGE RS S YNCH PERIOD UNIQUE W ORD BYTES GO INTO THESE BYTES 2 t CHECK BYTE S TERRESTRIAL DATA RATE RS CODE n k t 1544 1640 2048 2144 225 205 10 219 201...

Страница 254: ...R S TIM ING CONTROLLER U3 U3 U3 U3 U3 U3 U2 U1 Figure A 18 Reed Solomon Decoder Section Block Diagram The data and clock signals come from the demultiplexer on the interface PCB and are sent to the R...

Страница 255: ...s appended to the end of the data The term s k n and t will vary depending on the Reed Solomon coding used The Codec then sends the corrected data to a FIFO Because the check bytes are not part of the...

Страница 256: ...odec PCB as a daughter card on the main PCB Refer Figure A 19 for installation location of the Reed Solomon daughter card CAUTION Turn the power off before installation High current VDC is present Fai...

Страница 257: ...Options SDM 300A Satellite Modem A 68 Rev 4 CBA Figure A 19 Reed Solomon Codec Installation...

Страница 258: ...interface PCB is required to access certain options and functionality of the modem Observe the following If the overhead interface PCB is installed at the factory then the 50 pin interface relay card...

Страница 259: ...gh current VDC is present Failure to do so could result in damage to the modem components 1 Turn off the modem and unplug the power supply 2 Remove the rear panel retaining screws Using the finger pul...

Страница 260: ...SDM 300A Satellite Modem Options Rev 4 A 71 CBA Figure A 20 Overhead Interface PCB Installation...

Страница 261: ...hangeable firmware chips If necessary these chips can be removed and new chips added to allow for additional options enhancements or repairs Currently there are no foreseeable requirements for this ta...

Страница 262: ...irmware chips If necessary these chips can be removed and new chips added to allow for additional options enhancements or repairs Currently there are no foreseeable requirements for this task See Figu...

Страница 263: ...the SDR 54 receiver The 8 Channel Mux PCB can be installed in the factory or in the field This MUX PCB is used in conjunction with a compatible I O card to provide a 100 pin subminiature D style conn...

Страница 264: ...ionary procedures when touching removing or inserting PCBs 1 Turn power off and unplug the power supply 2 Remove the rear panel retaining screws Using the finger pulls slide the main modem assembly ou...

Страница 265: ...Options SDM 300A Satellite Modem A 76 Rev 4 Figure A 24 8 Channel Multiplexer Installation...

Страница 266: ...ary Clock Output Synchronous Mode 50 duty cycle 10 clock send timing is phase locked to the aggregate clock supplied by the modem Clock stability is based on the reference source The clock accuracy wi...

Страница 267: ...EIA 422 TX DATB TRIB3 26 TD422A_8 EIA 422 TX DATA TRIB8 76 TD422A_3 EIA 422 TX DATA TRIB3 27 TC422B_8 EIA 422 TX CLKB TRIB8 77 TC422B_3 EIA 422 TX CLKB TRIB3 28 TC422A_8 EIA 422 TX CLKA TRIB8 78 TC42...

Страница 268: ...place the non overhead 25 pin connector The particular overhead configuration of the PCB is determined by software control via the front panel Connection to external terrestrial equipment is supplied...

Страница 269: ...selected for Channels 3 and 4 simultaneously User Channel 3 Auxiliary Data Channel EIA 422 SYNC ASYNC with CTS flow control 0 6 to 40000 kbit s in 100 bit steps EIA 232 SYNC ASYNC with CTS flow contro...

Страница 270: ...re Channel 3 and 4 Data Interface Synchronous Mode The multiplexer supports synchronous data from each tributary The tributary interface use DCE conventions with data Send data sourced by external equ...

Страница 271: ...Buffer Clock Reference Driven from Insert Data In Insert Clock Receive Satellite Clock External Clock SCT from Modulator User Channel 2 ADPCM Audio Channel 32 kbit s audio channel 600 balanced 4 wire...

Страница 272: ...utionary procedures when touching removing or inserting PCBs 1 Turn power off and unplug the power supply 2 Remove the rear panel retaining screws Using the finger pulls slide the main modem assembly...

Страница 273: ...Options SDM 300A Satellite Modem A 84 Rev 4 Figure A 26 Flex Mux Multiplexer Installation...

Страница 274: ...CTS B 31 27 13 A2O A DSR DM A 48 11 6 E A2O B DM B 32 29 22 TXC A SCT ST A 21 5 15 8 Y TXC B SCT ST B 22 23 12 4 AA BWI 1 SCTE TT A 12 17 24 U BWI 2 SCTE TT B 13 35 11 W BWI 3 RS422TXO A 14 BWI 4 RS4...

Страница 275: ...Options SDM 300A Satellite Modem A 86 Rev 4 This page is intentionally left blank...

Страница 276: ...232 serial communications link menu selection Commands and data are transferred on the remote control communications link as US ASCII encoded character strings The remote control port baud rates can...

Страница 277: ...haracter B 2 1 Start Character A single character precedes all messages transmitted on the remote link This character flags the start of a message This character is for commands for responses B 2 2 De...

Страница 278: ...recognized command which cannot be implemented or has parameters which are out of range add ER3_unrecognizable command cr lf Error message for unrecognizable command or bad command syntax add ER4_mod...

Страница 279: ...s add SMRx_ cr add SMRx_ cr RF_OFF cr lf See MR command Where x A B C D or V preset designator Note Setting the modulator rate turns off the RF transmitter Modulator Rate Variable Assignment Selection...

Страница 280: ...xxxxx cr add MRC_xxxxx cr lf add MRC_ cr add MRC_xxxxx cr lf Where xxxxx INT INTERNAL EXT1 EXTERNAL 1 MHz EXT5 EXTERNAL 5 MHz EXT10 EXTERNAL 10 MHz EXT20 EXTERNAL 20 MHz OUT10 OUTPUT 10 MHz Modulator...

Страница 281: ...m mmm Data rate in kHz Demodulato r Rate Preset Selection Command Response Status add SDRx_ cr add SDRx_ cr lf See DR command Where x A B C D or V preset designator Demodulato r Rate Variable Assignme...

Страница 282: ...N NETWORK EFD EF DATA CLOSED NETWORK CSC COMSTREAM CLOSED NETWORK FDC FAIRCHILD CLOSED NETWORK Demodulato r Decoder Type Command Response Status Response add DDT_xxx cr add DDT_xxx cr lf add DDT_xxx c...

Страница 283: ...e xxx INT internal SCT clock EXT external TX terrestrial clock REF external clock reference frequency External Clock Reference Frequency Command Response Status Response add ERF_nnnnn n cr add ERF_nnn...

Страница 284: ...Status Response add IBS _nn cr add IBS _nn cr lf add IBS _ cr add IBS _nn cr lf Where nn 0 to 99 buffer size in milli seconds Note For Drop Insert 1 nn 7 5 15 or 30 milli seconds for E1CAS format 2 nn...

Страница 285: ...ponse add ISCL_xxx_snn cr add ISCL_xxx_snn cr lf add ISCL_xxx cr add ISCL_xxx_snn cr lf Where xxx TX1 TX2 RX1 or RX2 service channel designator nnn 20 to 10 in steps of 1 service channel level in dBm...

Страница 286: ...te divided by 64 kbit s cc 1 to 24 terrestrial channel number for T1 data formats cc 1 to 31 terrestrial time slot number for E1 data formats Notes 1 The status response returns programming informatio...

Страница 287: ...nnn cr add TOBR_nnnnn cr lf add TOBR_ cr add TOBR_nnnnn cr lf Where nnnnn 110 150 300 600 1200 2400 4800 9600 19200 or 38400 Note TX ASYNC Overhead only ASYNC Receive Overhead Baud Rate Command Respon...

Страница 288: ...add RCT_ cr add RCT_xxxxx cr lf Where xxxxx RS232 or RS485 Note RX ASYNC Overhead only Transmit Data Phase Command Response Status Response add TDP_xxxx cr add TDP_xxxx cr lf add TDP_ cr add TDP_xxxx...

Страница 289: ...ere xxxxxxx TX_ONLY RX_ONLY or DUPLEX This command configures the modem for simplex or duplex operation modes When transmit only mode is selected receive faults are inhibited and when receive only mod...

Страница 290: ...and will be in demand network systems B 3 5 Automatic Uplink Power Control AUPC AUPC Local Enable Command Response Status Response add LPC_xxx cr add LPC_xxx cr lf add LPC_ cr add LPC_xxx cr lf Where...

Страница 291: ...1 Always wait 3 seconds between consecutive remote modem command status polls 2 If Local AUPC is not enabled status commands will return last known condition They will also request status from the rem...

Страница 292: ...Response Status Response add MTCP_x_yyy cr add MTCP_x_yyy cr lf add MTCP_x cr add MTCP_x_yyy cr lf Where x 1 to 8 tributary number yyy NRM normal clock phasing INV inverted clock phasing Mux Tributar...

Страница 293: ...ed for ASYNC RS422 S422 Channel Enabled for SYNC RS422 Note This command enables channel 3 for SYNC ASYNC RS232 RS422 operation AUPC operation or can be disabled TX Channel 3 Data Rate Command Respons...

Страница 294: ...isabled AUPC Channel Enabled for AUPC A232 Channel Enabled for ASYNC RS232 S232 Channel Enabled for SYNC RS232 A422 Channel Enabled for ASYNC RS422 S422 Channel Enabled for SYNC RS422 Note This comman...

Страница 295: ...odem B 20 Rev 4 RX Channel Data Phase Channels 3 and 4 Command Response Status Response add RCDP_x_yyy cr add RCDP_x_yyy cr lf add RCDP_x cr add RCDP_x_yyy cr lf Where x 3 or 4 channel number yyy NRM...

Страница 296: ...lator Frequency Modulator Rate Preset A Assignment Preset B Assignment Preset C Assignment Preset D Assignment Preset V Assignment Modulator Power Offset Modulator Output Power Scrambler Enable Differ...

Страница 297: ...Channel 1 Enable Flex Mux TX Channel 1 Data Rate Flex Mux TX Channel 2 Enable Flex Mux TX Channel 3 Enable Flex Mux TX Channel 3 Data Rate Flex Mux TX Channel 3 Clock Phase Flex Mux TX Channel 3 Data...

Страница 298: ...ase Mux Tributary 2 Data Phase Mux Tributary 2 Mode Mux Tributary 2 Async Mode Mux Tributary 3 Data Rate Enable Mux Tributary 3 Interface Type Mux Tributary 3 Clock Phase Mux Tributary 3 Data Phase Mu...

Страница 299: ...Data not returned if Local AUPC is enabled TX ASYNC overhead 5 Data is only returned if MUX PCB Card Slot 1 is installed 6 Data is only returned if FLEX MUX PCB Card Slot 1 is installed 7 Data not re...

Страница 300: ...ncy Demodulator Rate Preset A Assignment Preset B Assignment Preset C Assignment Preset D Assignment Preset V Assignment Descrambler Enable Differential Decoder RF Loopback IF Loopback Sweep Center Fr...

Страница 301: ...able Flex Mux RX Channel 1 Data Rate Flex Mux RX Channel 2 Enable Flex Mux RX Channel 3 Enable Flex Mux RX Channel 3 Data Rate Flex Mux RX Channel 3 Clock Phase Flex Mux RX Channel 3 Data Phase Flex M...

Страница 302: ...cc_dd cc cr Note 2 BW_TX1_nnn cr Note 3 BW_TX2_nnn cr Note 3 BW_TX3_nnn cr Note 3 BW_TX4_nnn cr Note 3 BW_RX1_nnn cr Note 4 BW_RX2_nnn cr Note 4 BW_RX3_nnn cr Note 4 BW_RX4_nnn cr Note 4 TXDR_xxxxxx...

Страница 303: ...Character Length ASYNC Receive Channel Stop Bits ASYNC Receive Overhead Channel Parity ASYNC Receive Communications Type AUPC Local Power Enable AUPC Nominal Power Value AUPC Minimum Power Value AUPC...

Страница 304: ...hase Flex Mux RX Channel 3 Data Phase Flex Mux RX Channel 4 Enable Flex Mux RX Channel 4 Data Rate Flex Mux RX Channel 4 Clock Phase Flex Mux RX Channel 4 Data Phase The Interface configuration status...

Страница 305: ...zer Lock OK FLT I Channel OK FLT Q Channel OK FLT BER Threshold OK FLT Configuration OK FLT Number of stored faults logged 0 to 10 Interface Transmit Side Status Command Response add ITXS_ cr add ITXS...

Страница 306: ...Number of stored faults logged 0 to 10 The common equipment status command causes a block of data to be returned which indicates the status of the common equipment Interface Alarms Backward Alarm Stat...

Страница 307: ...eturned if the error rate cannot be calculated 3 Sampling is returned if not enough data is currently available to calculate the error rate Corrected BER Command Response add CBER_ cr add CBER_xm mE e...

Страница 308: ...If the FIFO becomes full the oldest sample will be lost as the current sample is written Notes 1 The most recent sample is represented by sn while the least recent sample is represented by s1 2 Data...

Страница 309: ...m mmm Data rate in kHz Demodulato r Rate Status Command Response add DR_ cr add DR_nnnn_mmmm mmm cr lf Where nnnn 1 2 QPSK 1 2 coder rate 3 4 QPSK 3 4 7 8 QPSK 7 8 BP12 BPSK 1 2 8P23 8PSK 2 3 OQ12 OQP...

Страница 310: ...stead of the normal time date status information The following symbols are commonly used to define the stored faults status commands Fault number 0 to 9 0 is the first fault stored hh Hours in 24 hr f...

Страница 311: ...L Lock OK FLT Demux Lock OK FLT 2047 Pattern Lock Detect OK FLT Buffer Full OK FLT D I Insert OK FLT Receive Audio Clip Channel 1 OK FLT Receive Audio Clip Channel 2 OK FLT Configuration OK FLT Common...

Страница 312: ...returned Parameter Number Parameter Name Command Reference Description 1 2 3 4 5 6 Receive Signal Level ref RSL_ command Raw BER ref RBER_ command Corrected BER ref CBER_ command Interface Read Error...

Страница 313: ...command Modulator preset A assignment ref ARMA_ command Modulator preset B assignment ref ARMB_ command Modulator preset C assignment ref ARMC_ command Modulator preset D ref ARMD_ command Modulator...

Страница 314: ...command BER threshold ref BERT_ command Demodulator type ref DT_ command Demodulator decoder type ref DDT_ command Transmit clock source ref TC_ command External reference frequency ref ERF_ command p...

Страница 315: ...rface Buffer Programming ref IBP_ command Interface buffer size ref IBS _ command Interface transmit overhead type ref ITOT_ command Interface receive overhead type ref IROT_ command Interface substit...

Страница 316: ...ulk Insert Channels Assignment Insert E1 CRC Enable ref ICRC_ command Modem Reference Clock ref MRC_ command Modulator Spectrum Rotation ref MSR_ command p53 n where n is 0 NONE 1 DATA or 2 AIS p54 n...

Страница 317: ...BW_RX4_ command TX Driver Type ref TXDR_ command RX Driver Type ref RXDR_ command reserved null field ASYNC TX Overhead Baud Rate ref TOBR_ command ASYNC RX Overhead Baud Rate ref ROBR_ command ASYNC...

Страница 318: ...UPC Max Tracking Rate ref MAXT_ command AUPC Local Carrier Loss ref LCL_ command AUPC Remote Carrier Loss ref RCL_ command reserved null field reserved null field Transmit BPSK Data Ordering ref TDA_...

Страница 319: ...ation ref T310_ command RX 8PSK 2 3 IESS 310 Operation ref R310_ command Flex Mux Channel 1 Enable ref TCEN_1 command TX Flex Mux Channel 1 Data Rate ref TCDR_1 command TX Flex Mux Channel 2 Enable re...

Страница 320: ...P_3 command RX Flex Mux Channel 3 Data Phase ref RCDP_3 command RX Flex Mux Channel 4 Enable ref RCEN_4 command RX Flex Mux Channel 4 Data Rate ref RCDR_4 command RX Flex Mux Channel 4 Clock Phase ref...

Страница 321: ...urned 7 Data is only returned if FLEX MUX PCB Card Slot 1 is installed Comma is always returned 8 Data not returned if TX Channel 1 is disabled Comma is always returned 9 Data not returned if TX Chann...

Страница 322: ...el Bit 1 Q Channel Bit 0 AGC Level Character c Modulator fault status character 3 Bit 6 1 always Bit 5 Modem Reference PLL Lock Bit 4 reserved Bit 3 Configuration Bit 2 Modem Reference Activity Bit 1...

Страница 323: ...Bit 5 Buffer Underflow Bit 4 Buffer Overflow Bit 3 Receive Data Loss AIS Bit 2 Frame BER Bit 1 Receive Backward Alarm Bit 0 Selected Buffer Clock Activity Character l Interface receive side faults cha...

Страница 324: ...o change since last BCS_ and BCSF_ polls A BCS_ response has changed since last BCS_ poll B BCSF_ response has changed since last BCSF_ poll C Both responses have changed since last BCS_ and BCSF_ pol...

Страница 325: ...h Stability or Asymmetrical Loop Timing or Viterbi Encoder Decoder or Sequential Encoder Decoder or Single Code Data Rate or Low Rate Variable or Full Rate Variable x or Card 1 Installed x or Card 2 I...

Страница 326: ...cr lf RS_03 list s INTELSAT cr lf or or Notes 1 Card 2 Installed Only 2 s Not Installed FAST Upgradable 3 Installed Card 3 Options Misc Information Command Response add C3OI_ cr add C3OI_ cr RS_02 lis...

Страница 327: ...lf Test State Of Product Command Response add SOP_ cr add SOP_ cr add cr abc cr rrrrr bps cr var string1 cr var string2 cr lf Product Address Data Format Baud Rate Comm Type Where abc Explained below...

Страница 328: ...tatus Response add TCDR_3_xxxxxx cr add TCDR_3_xxxxxx cr lf add TCDR_3 cr add TCDR_3_xxxxxx cr lf Where xxxxxx 0 6 to 4000 0 for RS422 kbit s in 100 bit s steps 0 6 to 64 0 for RS232 kbit s in 100 kbi...

Страница 329: ...22 kbit s in 100 bit s steps 0 6 to 64 0 for RS232 kbit s in 100 bit s steps RX Channel 4 Enable Command Response Status Response add RCEN_4_xxxxxxxxxxx cr add RCEN_4_xxxxxxxxxxx cr lf add RCEN_4 cr a...

Страница 330: ...SDM 300A Satellite Modem Remote Control Operation Rev 4 B 55...

Страница 331: ...0 MHz Synthesized in 1 Hz steps Modulation Types Front panel selection 8PSK BPSK QPSK OQPSK FAST upgrade front panel selection Operating Channel Spacing Less than 0 5 dB degradation operating with two...

Страница 332: ...DR IBS None field selectable Loopback Modes Baseband near end and far end Interface near end and far end D I baseband insert data into drop data out IF Loopback near end RF Loopback far end Diagnostic...

Страница 333: ...ive Clock Normal Invert Differential Encoding and Decoding Code and Decode Rate Transmit and Receive Overhead Type Acquisition Sweep Parameters Buffer Size IDR Backward Alarm Control On Off Reed Solom...

Страница 334: ...it s 2 5 Mbit s 3 75 Mbit s 4 375 Mbit s 2 5 Mbit s 3 75 Mbit s 4 375 Mbit s 5 0 Mbit s BPSK 1 2 QPSK 1 2 QPSK 3 4 QPSK 7 8 Sequential Sequential Sequential Sequential 2 4 kbit s 4 8 kbit s 7 2 kbit s...

Страница 335: ...it s 2048 kbit s 2048 kbit s 2048 kbit s 2048 kbit s 2048 kbit s 2048 kbit s 1024 kbit s 1024 kbit s 8PSK 2 3 8PSK 2 3 QPSK 1 2 QPSK 1 2 8PSK 2 3 8PSK 2 3 IBS IBS and Reed Solomon D I D I and Reed Sol...

Страница 336: ...K7 TCM 2 3 8PSK Viterbi K7 Reed Solomon 1 2 3 4 7 8 225 205 Closed or IDR T1 126 112 IBS and D I 219 201 IDR E1 QPSK OQPSK Viterbi K7 TCM Reed Solomon EFD Compatible 2 3 225 205 Closed or IDR T1 126 1...

Страница 337: ...The differential encoder On or Off takes care of one set of ambiguities due the error correction codes being transparent C 2 5 BPSK Bit Ordering The encoder has the ability to select whether I is the...

Страница 338: ...20 dBm DC offset Capacitively coupled Connector BNC Reference Frequency Output Optional The External frequency reference connector can be used as an output when the High Stability option is installed...

Страница 339: ...or Power Offset An offset to the displayed IF output power may be entered from 99 0 to 99 0 dB in 0 1 dB steps C 2 14 Modulated IF Output Shape The modem meets the following transmit output spectral m...

Страница 340: ...on The operator can select Normal or Inverted spectrum of the of the Modulator Output C 2 19 Encoding C 2 19 1 BPSK Encoding The modulator converts transmitted baseband data into a modified BPSK carri...

Страница 341: ...nnel modulation signals This offset prevents the RF envelope from going through zero Under certain conditions this may allow less back off in the High Power Amplifier HPA system The 1 1 1 2 3 4 and 7...

Страница 342: ...3 4 QPSK 7 8 8PSK 2 3 Viterbi and Reed Solomon Viterbi and Reed Solomon Viterbi and Reed Solomon Viterbi and Reed Solomon Viterbi and Reed Solomon Viterbi and Reed Solomon Viterbi and Reed Solomon Vi...

Страница 343: ...PSK 1 1 None None None 4 8 Kbit s 9 6 kbit s 9 6 kbit s 2 5 Mbit s 5 0 Mbit s 5 0 Mbit s C 3 2 Demodulation and FEC Decoding Types Table C 5 shows combinations of demodulation and forward error correc...

Страница 344: ...arent On or Off C 3 5 BPSK Bit Ordering The decoder has the ability to select whether I is the first bit or Q is the first bit in the symbol word grouping for compatibility with any system For standar...

Страница 345: ...er within the same parameters as QPSK The OQPSK modulation is mainly different from QPSK by offsetting the I and Q channel modulation signals This offset prevents the RF envelope from going through ze...

Страница 346: ...m the programmed frequency is available to the operator on the front panel as well as the remote port The resolution of this value is 1 Hz Monitor accuracy is 10 PPM C 3 10 Receive Input Power Desired...

Страница 347: ...t SDM 51 SDM 52 C 3 14 Channel Spacing Adjacent Carrier Performance The modem bit error performance will be degraded 0 5 dB with the following receive IF signal Two like modulated carriers spaced 1 3...

Страница 348: ...ption Table C 7 Viterbi Decoder with Open Network BER Data Table C 8 Viterbi Decoder with Closed Network BER Data Table C 9 Viterbi Decoder with Reed Solomon Optional Table C 10 Sequential Decoder 56...

Страница 349: ...QPSK mode Without coding the modem provides QPSK operation within 0 8 dB of theoretical for BER in the range 10 1 to 10 6 Performance measurements were recorded with transmit and receive IF connected...

Страница 350: ...Specifications SDM 300A Satellite Modem C 20 Rev 4 3 4 Rate 1 2 Rate 7 8 Rate Specification Figure C 1 Viterbi BER Performance Curves...

Страница 351: ...s the Viterbi with Closed Network specifications for the Eb N0 required to achieve 10 5 to 10 10 BER for different configurations Table C 8 Viterbi Decoder with Closed Network BER Data Eb N0 dB Specif...

Страница 352: ...Specifications SDM 300A Satellite Modem C 22 Rev 4 3 4 Rate 1 2 Rate 7 8 Rate Specification Figure C 2 Viterbi with Reed Solomon BER Performance Curves...

Страница 353: ...i decoder with Reed Solomon BER curves Table C 9 lists the Viterbi decoder with Reed Solomon specifications for the Eb N0 required to achieve 10 6 to 10 10 BER for different configurations Table C 9 V...

Страница 354: ...e Modem C 24 Rev 4 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 3 0 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 1 2 RATE SPECIFICATIONS 3 4 RATE 7 8 RATE Figure C 3 Noise Viterbi and Reed Solomon...

Страница 355: ...the sequential specifications for the Eb N0 required to achieve 10 3 to 10 8 BER at 56 kbit s All values are for operating in BPSK and QPSK modes Table C 10 Sequential BER Data 56 kbit s Eb N0 dB Spec...

Страница 356: ...A Satellite Modem C 26 Rev 4 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 3 0 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 1 2 Rate 3 4 Rate 7 8 Rate SPECIFICATIONS Figure C 4 Sequential BER Perfor...

Страница 357: ...ntial specifications for the Eb N0 required to achieve 10 3 to 10 8 BER at 1544 kbit s All values are for operating in BPSK and QPSK modes Table C 11 Sequential Decoder BER Data 1544 kbit s Eb N0 dB S...

Страница 358: ...ellite Modem C 28 Rev 4 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 3 0 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 1 2 Rate 3 4 Rate 7 8 Rate SPECIFICATIONS Figure C 5 Sequential Decoder BER Per...

Страница 359: ...e Sequential BER curves Table C 12 lists the sequential specifications for the Eb N0 required to achieve 10 3 to 10 8 BER at 1544 kbit s All values are for operating in BPSK and QPSK modes Table C 12...

Страница 360: ...Specifications SDM 300A Satellite Modem C 30 Rev 4 3 4 Rate 1 2 Rate 7 8 Rate Specification Figure C 6 Sequential BER Curves at 1544 kbit s and Reed Solomon...

Страница 361: ...the 8PSK curves Table C 13 lists the 8PSK specification for performance with noise and with without Reed Solomon All values are for operating in 8PSK mode Table C 13 8PSK Specification Eb N0 dB Specif...

Страница 362: ...Specifications SDM 300A Satellite Modem C 32 Rev 4 Figure C 7 8PSK BER Specification Curves 1544 kbit s...

Страница 363: ...Table C 14 lists the Viterbi and OQPSK specifications for the Eb N0 required to achieve 10 3 to 10 8 BER for different configurations Table C 14 Viterbi Decoder and OQPSK Eb N0 dB Specification BER 1...

Страница 364: ...Specifications SDM 300A Satellite Modem C 34 Rev 4 3 4 Rate 1 2 Rate 7 8 Rate Specification Figure C 8 Viterbi Decoder and OQPSK...

Страница 365: ...bler desrambler Off Encoded QPSK and OQPSK with scrambler descrambler and differential encoder decoder Off Table C 15 Uncoded 1 1 BPSK QPSK and OQPSK Eb N0 dB Specification BER 1 1 10 3 8 8 10 4 9 6 1...

Страница 366: ...Specifications SDM 300A Satellite Modem C 36 Rev 4 1 1 Rate Specification Figure C 9 Uncoded 1 1 BPSK QPSK and OQPSK...

Страница 367: ...4 8 9 6 kbit s 10 sec 95 1 2 9 6 64 kbit s 5 sec 95 1 2 64 196 kbit s 1 sec 95 1 2 196 512 kbit s 17 sec 95 1 2 512 1000 kbit s 2 5 sec 95 1 2 1 2 5 Mbit s 1 sec 95 C 5 1 Receive IF Carrier Acquisitio...

Страница 368: ...y option 0 2 PPM C 6 3 Send Clock Timing Source The send clock timing output can be generated from the Frequency Reference either via the front panel or remotely If loop timing is selected the send cl...

Страница 369: ...onous buffer clock reference can be selected by the operator from the following sources The RX satellite clock Bypass Mode The TX terrestrial clock TT Must be within 100 PPM of the nominal receive dat...

Страница 370: ...iochronous Buffer Size The RX Doppler buffer size can be set by the operator from Bypass 32 to 262 144 bits in 16 bit steps Selectable in ms from 2 to 98 in 2 ms steps based on the data rate Selectabl...

Страница 371: ...22 MIL 188 114A Optional mechanical interfaces are also available See Chapter 2 for pinout information 37 pin D EIA 449 34 pin Block V 35 50 pin D The following interface types are available through t...

Страница 372: ...T CTS DM DSR True 10V 5V False 10V 5V Receiver Amplitude TXD TXC RTS LL MC True Minimum 1V False Maximum 1V Impedance 5000 2000 2500 pF Data Rate 9 6 to 120 kbit s Circuit Assignments TXD Send Data RX...

Страница 373: ...ositive with respect to B Polarity RTS CTS DSR RLSD True when 0 2V with respect to ground False when 0 2V with respect to ground Phasing SCTE SCR False to True transition nominally in center of data b...

Страница 374: ...Send Timing RD A RD B Receive Data RS A RS B Request to Send RT A RT B Receive Timing CS A CS B Clear to Send DM A DM B Data Mode RR A RR B Receiver Ready TT A TT B Terminal Timing MC A MC B Master Cl...

Страница 375: ...its EIA 232 Specification Circuits Supported SD RD RTS CTS connected by break out panel Amplitude RD CTS True 10V 5V False 10V 5V Amplitude SD RTS True Minimum 1V False Maximum 11V Impedance 5000 2000...

Страница 376: ...its 1 or 2 bits Odd Even or None C 8 3 Local Automatic Uplink Power Control AUPC Note AUPC functions are only available with ASYNC overhead The operator can select local AUPC to be Enabled or Disabled...

Страница 377: ...r both local and remote carrier loss Note Local carrier loss has priority over remote carrier loss C 8 8 Remote AUPC The operator can select remote AUPC to be enabled or disabled The operator also can...

Страница 378: ...False 10V 5V Amplitude SD ST RTS True Minimum 1V False Maximum 11V Impedance 5000 2000 2500 pF Faults and Alarms Satellite Backward Alarm 1 per IESS 309 Receive BWA Output Enabled onto terrestrial se...

Страница 379: ...ransmit clock to the modulator portion of the base modem C 9 5 IBS Engineering Service Channel Bi directional processing of the components of the ESC channel including the asynchronous or synchronous...

Страница 380: ...r higher Timeslot Selection Range 1 to 24 all T1 modes 1 to 30 E1_CAS and E1_CCS 1 to 31 E1_31TS Arbitrary order non contiguous available Plesiochronous Buffer Sizes 7 5 15 and 30 ms E1_CAS 6 12 24 an...

Страница 381: ...the following changes Accepts and outputs primary data through the 50 pin connector using G 703 The data rate must be at T1 or E1 rates only This includes additional links for Drop Data Out and Inser...

Страница 382: ...ported 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 edge Octet Timing Octet high in with every 8th bit ali...

Страница 383: ...om the demodulator portion of the modem Resulting G 703 data is optionally encoded AMI B8Z5 or HDB3 before being output on the 50 pin connector C 11 4 IDR Engineering Service Channel Bi directional pr...

Страница 384: ...e ability to generate 211 1 2047 PN data and pass the data through the Interface Modulator and Demodulator sections of the modem The modem can generate noise in the IF path to simulate a satellite env...

Страница 385: ...for this piece of equipment C 12 4 Modem Remote Address Note The value of zero is defined as global The modem will have the ability to be programmed for a remote address This will range from 0 to 255...

Страница 386: ...on prior to resetting A hard reset will return the configuration to the factory default settings By using the front panel the operator can correct the drift due to crystal aging on an annual basis C 1...

Страница 387: ...xtend the lifetime of the satellite using the motor less often The older satellite will be found in a more inclined orbit with the station keeping various in latitude by as much as 4 The total effect...

Страница 388: ...Specifications SDM 300A Satellite Modem C 58 Rev 4 This page is intentionally left blank...

Страница 389: ...Automatic Gain Control AIS Alarm Indication Signal AM Amplitude Modulation ASCII American Standard Code for Information Interchange BB Baseband bit s bits per second C Celsius CLK Clock COM Common CS...

Страница 390: ...ntrol Max Maximum Mbit s Megabits per second MC Monitor and Control MFS Multiframe Sync MHz Megahertz 106 Hertz Mod Modulator MOP Modulated Output Power MSB Most Significant Bit n nano 10 9 N A Not Ap...

Страница 391: ...g 3 TT Terminal Timing TTL Transistor Transistor Logic TX Transmit Transmitter TXCLK Transmit Clock TXD Transmit Data US United States V Volts VAC Volts Alternating Current VCO Voltage Controlled Osc...

Страница 392: ...Glossary SDM 300A Satellite Modem g 4 Rev 4 This page is intentionally left blank...

Страница 393: ...n A 26 ASYNC Data Interfaces A 23 ASYNC Remote Operation A 28 ASYNC AUPC Block Diagram A 20 ASYNC AUPC Modem Defaults A 40 ASYNC AUPC Operation 3 80 Asynchronous Interface AUPC A 19 Asynchronous Param...

Страница 394: ...ications A 8 D I with Asynchronous Overhead Block Diagram A 10 D I with Asynchronous Overhead Data Flow A 11 Data I O Connector J8 Installation 2 16 Data I O Connector J8 Removal 2 15 2 17 Data I O In...

Страница 395: ...Operation 3 77 IDR Parameter Settings 3 77 IDR Primary Data Interfaces C 44 IDR Specifications A 49 IF Input Overload C 30 IF Loopback 3 72 3 74 A 18 A 50 A 54 B 6 B 25 B 26 Implementation 4 17 A 1 A...

Страница 396: ...ppler Buffer 4 15 Plesiochronous Buffer A 8 A 13 A 82 Q QPSK Encoding 4 8 R Receive Clock Switching Due to Failure of Selected Clock C 33 Receive Clock Jitter C 33 Receive Clock Phase Adjustment C 33...

Страница 397: ...25 Transmit IF Power C 25 Transmit IF Test Modes C 26 Transmit Frequency IF C 24 Transmit Frequency Change Time C 24 Transmit Interface Faults 3 40 5 15 Transmit Section of the Asymmetrical Loop Timi...

Страница 398: ...Index SDM 300A Satellite Modem i 6 Rev 4 This page is intentionally left blank...

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