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SDM-309B Satellite Modem

Theory of Operation

MN/U-SDM309B Rev. #

5-5–7

module. It contains circuitry which provides programmable control of the output level
over a 10 dB range in .5 dB Steps and power leveling to maintain the stability of the
output level over time and temperature.

5.2 Viterbi Decoder / Demodulator Processor

5.2.1 General Description

The modem Viterbi Decoder/Demod Processor is a 10.25" x 14" card (Figure 5-4
through Figure 5-6) that fits in the middle left slot of the modem chassis. The card
performs four separate functions. It contains the Digital Costas Processor which provides
signals to the Demodulator board for carrier recovery and automatic gain control, it
performs clock recovery of both the symbol clock and the data clock, it provides the
forward error correction function utilizing a Viterbi decoder, and it provides differential
decoding. There are three Viterbi decoder options available in the field.

The 0701 board is the oldest model used in the old SDM-309 modems. The original IBS
modems were used with the external channel units and could operate at data rates of 64
kbs to 2048 kbs. The M&C firmware used with the 0701 board is version 2.XX. If a
customer needs to replace a 0701 decoder board, they will receive the 2133 Viterbi board
and must upgrade the M&C firmware.

The 0949 board and the 2133 board can operate from 9.6 kbs (BPSK) to 8 Mbs.
Firmware is backward compatible between the 0949 and the 2133 boards, but older
firmware will not operate in the newer boards. An example would be a 2133 board that
has 6.XX firmware in the M&C could be replaced with an 0949 board. But an 0949
board that has 4.XX firmware in the M&C could not be replaced with a 2133 board
without upgrading the M&C firmware. All new SDM-309B modems will be shipped
with the new 2133 Viterbi decoder boards.

A block diagram of the board is found in Figure 5-7. A detailed description of the
module appears in Section 5.2.3

5.2.2 Viterbi Decoder/Demod Processor Specification

5.2.2.1 Demod Processor Specification

Operating Symbol Rate Range

19.2 Kb/s to 2048 Kb/s

Operating Code Rate Range

7/8, 3/4, 1/2

Input Signal

11 Level Quantized I and Q

Output Signals

VCXO Drive, AGC Drive, I sign,
I mag, Q sign, Q mag, Symbol Clock,
Data Clock

Carrier Phase Error

± 3 ° Max

Carrier Loop Bandwidth

Software Controlled

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Содержание SDM-309B

Страница 1: ...DM 309B SDM 309B Satellite Modem Satellite Modem Satellite Modem Satellite Modem Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Part Number MN SDM309B IOM Edition 2 February 29 1992 ...

Страница 2: ...an ISO 9001 Registered Company SDM 309B SDM 309B SDM 309B SDM 309B Satellite Modem Satellite Modem Satellite Modem Satellite Modem Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Part Number MN SDM309B IOM Edition 2 February 29 1992 Special Instructions This is the second edition of the manual ...

Страница 3: ...Adaptive Broadband 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 Adaptive Broadband shall not be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory Disclaimer Adaptive Broad...

Страница 4: ...e for the operation and maintenance of the SDM 309B Conventions and References Used in this Manual Cautions and Warnings CAUTION CAUTION indicates a hazardous situation that if not avoided may result in minor or moderate injury CAUTION may also be used to indicate other unsafe practices or risks of property damage WARNING WARNING indicates a potentially hazardous situation that if not avoided coul...

Страница 5: ...ks of their respective companies and are hereby acknowledged Reporting Comments or Suggestions Concerning this Manual Comments and suggestions regarding the content and design of this manual will be appreciated To submit comments please contact the Adaptive Broadband Customer Support Department according to the following information ...

Страница 6: ...161 FAX or E Mail can be sent to the Customer Support Department at service adaptivebroadband com To return an Adaptive Broadband product in warranty and out of warranty for repair or replacement 1 Request a Return Material Authorization RMA number from the Adaptive Broadband Customer Support Department Be prepared to supply the Customer Support representative with the model number serial number a...

Страница 7: ...Preface SDM 309B Satellite Modem iv Rev 0 This page is intentionally blank ...

Страница 8: ... 1 2 2 1 Data I O 2 4 2 2 2 Remote J6 2 4 2 2 2 1 Connector Pinout J6 2 4 2 2 3 Fault J7 2 4 2 2 3 1 Connector Pinout J7 2 4 2 2 4 IF Output CP1 2 5 2 2 5 IF Input CP2 2 5 2 2 6 AC Power 2 5 2 2 7 GND 2 5 2 3 System Requirements 2 5 2 4 System Installation 2 6 CHAPTER 3 OPERATION 3 1 3 1 SDM 309 M1200P Front Panel 3 1 3 1 1 General 3 1 3 1 2 LED Indicators 3 1 3 1 3 Front Panel Controls 3 2 3 1 4 ...

Страница 9: ...Faults 3 36 3 2 4 3 CEQ_Flts Common Equipment Faults 3 36 3 2 4 4 TX_INTF Transmit Interface Faults 3 36 3 2 4 5 RX_INTF Receive Interface Faults 3 36 3 2 5 Stored Faults 3 36 3 2 6 Utility 3 37 CHAPTER 4 M C AND INTERFACES 4 1 4 1 Monitor And Control 4 1 4 1 1 General 4 1 4 1 2 Description of Options 4 1 4 1 2 1 Remote Interface 4 1 4 1 2 2 Remote Baud Rate 4 4 4 1 2 3 Remote Address 4 4 4 1 2 4 ...

Страница 10: ...sert Data Output and Ext Ref Clk J1 4 36 4 2 2 10 2 Drop Data Output J2 4 36 4 2 2 10 3 Insert Data Input J3 4 36 4 2 2 10 4 Insert Data Output J4 4 37 4 2 2 10 5 Drop Data Input J5 4 37 4 2 2 10 6 Drop Data Output J6 4 37 4 2 2 10 7 Insert Data Input J7 4 37 4 2 2 10 8 Insert Data Output J8 4 37 4 2 2 10 9 External Reference Clock J9 4 37 4 2 2 10 10 ESC Channel J10 4 38 4 2 2 10 11 Faults J11 4 ...

Страница 11: ...uisition And Directed Sweep 5 19 5 4 1 General 5 19 5 4 2 Reacquisition 5 20 5 4 3 Fast Acquisition 5 21 5 4 4 Directed Sweep 5 21 CHAPTER 6 MAINTENANCE 6 1 6 1 System Checkout 6 1 6 1 1 General 6 1 6 1 2 Modulator Checkout 6 1 6 1 3 Demodulator Checkout 6 1 6 1 4 Test Points 6 8 6 1 4 1 Modulator Figure 6 5 6 8 6 1 4 2 Demodulator Figure 6 6 6 9 6 1 4 3 Viterbi Decoder demod Card AS 0701 Figure 6...

Страница 12: ... Table of Contents Rev 0 ix 6 6 Repacking For Shipment 6 22 APPENDIX A DATA RATES AND FILTERS A 1 APPENDIX B SATELLITE MODEM REMOTE CONTROL B 1 APPENDIX C EXTERNAL CHANNEL UNIT C 1 APPENDIX D SOFTWARE CHANGE SPECIFICATIONS D 1 ...

Страница 13: ...Table of Contents SDM 309B Satellite Modem x Rev 0 This page is intentionally blank ...

Страница 14: ...and IF converter equipment operating in a 50 to 90 MHz or 100 to 180 MHz band Figure 1 2 This modem can be used with an external channel unit Multipoint M1200 or equivalent Refer to Appendix C for more information The modem contains built in scrambler descrambler differential encoder decoder transmit and receive frequency synthesizers and a multi rate Forward Error Correction FEC convolutional enc...

Страница 15: ...on SDM 309B Satellite Modem 1 1 2 MN U SDM309B Rev the modem are located on the front panel The chassis also contains the power supply and a fan is on the rear panel A system block diagram is shown in Figure 1 4 ...

Страница 16: ...SDM 309B Satellite Modem Introduction MN U SDM309B Rev 1 1 3 Figure 1 1 SDM 309B Modem ...

Страница 17: ...Introduction SDM 309B Satellite Modem 1 1 4 MN U SDM309B Rev Figure 1 2 Satellite Communications System With SDM 309B Modem ...

Страница 18: ...SDM 309B Satellite Modem Introduction MN U SDM309B Rev 1 1 5 Figure 1 3 Modular Construction ...

Страница 19: ...Introduction SDM 309B Satellite Modem 1 1 6 MN U SDM309B Rev Figure 1 4 SDM 309B Block Diagram ...

Страница 20: ...tion 5 2 for more information on the available revisions and compatibility information 1 4 System Specification Table 1 1 lists the operating specifications of the modem The bit energy to noise ratio Eb N0 required to achieve 10 5 and 10 7 bit error rates is listed in Table 1 2 The typical bit error rate performance of the modem is shown in Figure 1 5 and a typical output spectrum of the modem is ...

Страница 21: ...pedance 75 Output Return Loss 20 dB Output Frequency Stability 10 ppm Data Clock Source Internal or External Internal Data Clock Stability 50 ppm Additional Demodulator Specifications Input Power Desired Carrier Maximum Total 30 to 55 dBm 30 dB power within 20 Mhz from desired carrier 40 dB power outside of 20 Mhz from desired carrier 0 dBm Input Impedance 75 Input Return Loss 20 dB Carrier Acquis...

Страница 22: ...to noise ratio Eb N0 required to achieve 10 3 to 10 8 bit error rates at various data rates for different coding configurations is shown below All values are for operation in QPSK mode The modem alone without coding provides operation within 0 5 dB of theoretical for BPSK and within 0 8 dB for QPSK for BER s in the range 10 1 to 10 6 Performance measurements are with Transmit and Receive IF connec...

Страница 23: ...Introduction SDM 309B Satellite Modem 1 1 10 MN U SDM309B Rev Figure 1 5 Typical Bit Error Rate Performance ...

Страница 24: ...SDM 309B Satellite Modem Introduction MN U SDM309B Rev 1 1 11 Figure 1 6 SDM 309B Modem Typical Output Spectrum ...

Страница 25: ...Introduction SDM 309B Satellite Modem 1 1 12 MN U SDM309B Rev ...

Страница 26: ...or to another site d Inspect the equipment for damage incurred during shipment e Check the equipment against the packing list shipped with the equipment to ensure that the shipment is complete 2 2 External Connections Connections between the modem and other equipment are made through six connectors These connectors are listed in Table 2 1 and their locations are shown in Figure 2 1 The use of each...

Страница 27: ...odem 2 2 2 MN U SDM309B Rev FAULT J7 9 PIN D 2 2 3 FORM C FAULT RELAY CONTACTS IF OUTPUT CP1 BNC 2 2 4 TX IF OUTPUT IF INPUT CP2 BNC 2 2 5 RX IF INPUT AC POWER NONE STANDARD 2 2 6 AC POWER INPUT GND NONE 10 32 STUD 2 2 7 CHASSIS GROUND ...

Страница 28: ...SDM 309B Satellite Modem Installation MN U SDM309B Rev 2 2 3 Figure 2 1 Rear Panel View ...

Страница 29: ...chanical security of the mating connector The remote connector is a DCE interface RS485 RS232 Pin Name Pin Name 1 GND 1 2 2 RD RX 3 3 TD TX 4 RX TX 4 5 RX TX 5 GND 6 6 DSR 7 7 RTS 8 RX TX 8 CTS 9 RX TX 9 2 2 3 Fault J7 The fault connector on the modem is used to provide FORM C contact closures for the purpose of fault reporting There are three 3 FORM C summary fault contacts modulator demodulator ...

Страница 30: ...are selected and demodulated to produce clock and data at the DATA I O connector 2 2 6 AC Power The AC power is supplied to the modem by a standard detachable non locking 3 prong power cord Normal input voltage is 90 132 VAC or 180 264 VAC 47 63 Hz Maximum power consumption is less than 75 W Note Damage may result if the incorrect input voltage is applied to this connector If there is any question...

Страница 31: ... modem will be set up to match the daughter cards when it is shipped from the factory 2 4 System Installation After unpacking the modem per Section 2 1 installation of the modem can be done as follows a Mount the modem chassis in the assigned position in the equipment rack b Connect the cables on the rear panel to the appropriate location Refer to Section 2 2 for connector pinouts placement and fu...

Страница 32: ...ive predefined sELECT categories or levels Configuration CONFIG Monitor Faults Stored Faults StFaults and Utility 3 1 2 LED Indicators General modem status and summary fault information is indicated by eight LED s on the front panel The indicators are defined as follows Faults Transmit Red LED Indicates that a Modulator fault or a Transmit Interface fault condition exists Receive Red LED Indicates...

Страница 33: ...s that the key pressed was a valid entry and the appropriate action was taken However a double beep when a key is pressed indicates that the key pressed was an invalid entry The Modem front panel control uses a tree structured menu system Figures 3 2 to 3 7 to access and execute all functions The base level of this structure is the sign on message which is displayed at the front panel upon modem p...

Страница 34: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 3 Figure 3 1 Front Panel View ...

Страница 35: ...not be programmed If your modem is equipped with the variable rate option you can also select TXV and enter the desired data rate To change the rate using the variable rate selection press the ENTER key when TXV is displayed A flashing cursor will be displayed on the first character of the coding type on line one Use the right and left arrow keys to move the flashing cursor and the up and down arr...

Страница 36: ... ENTER key to execute the change CW_Mode Programs the modem for continuous wave mode Three modes of operation are available center dual and offset modes Center Mode Generates a carrier at the current modulator frequency This can be used to measure the output power and output frequency Dual Mode Generates a dual side band suppressed carrier signal Side bands are at one half 1 2 the symbol rate from...

Страница 37: ...ss the ENTER key execute the change Note The receiver frequency is programmable within the specified range 50 90 MHz or 100 180 MHz in 2 5 KHz Steps DifDecdr Programs the differential decoder On or Off On entry the current status of the differential decoder is displayed with the flashing cursor on the first character Use the arrow keys to select ON or OFF Press the ENTER key to execute the change ...

Страница 38: ...the sweep center frequency SWP_RNGE Programs the overall travel of the sweep width range during acquisition in the directed sweep mode The sweep width may be set from 0 Hz to 50000 Hz When set at 50000 Hz the modem is in the fast acquisition mode On entry the current programmed setting is displayed with a flashing cursor on the first character Use the right and left arrow keys to move the flashing...

Страница 39: ...execute the change RX_Clock Programs the RX clock to Normal or Inverted On entry the current status of the RX Clock is displayed with the flashing cursor on the first character Use the arrow keys to select Normal or Inverted Press the ENTER key to execute the change Ext_REF Program the external reference clock input frequency between 8 KHz and 10 MHz in 8 KHz Steps On entry the current setting for...

Страница 40: ...ed for Receive Data is coming from the Satellite Refer to TXD_FLT for a description of the function choices On entry the current RX Data fault that is being monitored is displayed with the flashing cursor on the first character Use the arrow keys to select Data AIS or None Press the ENTER key to execute the change BUF_SIZE This configuration function is used to set the size of the plesiochronous b...

Страница 41: ...een turned on in the Utility menu 3 1 6 Faults The FAULTS level is accessible from the sELECT menu Faults are similar to monitor functions as they display the current fault status of the group being displayed Use the right and left arrow keys to move between the fault groups Mod_Flts modulator faults Dmd_Flts demodulator faults CEQ_Flts common equipment faults TX_INTF transmitter interface faults ...

Страница 42: ...gram 3 1 6 3 CEQ_Flts Common Equipment Faults Battery Battery fault 12 volt Negative 12 volt power supply fault 12 volt Plus 12 volt power supply fault 5 volt Plus 5 volt power supply fault Intrface Interface module fault Typically indicates that the interface module is missing or will not program 3 1 6 4 TX_INTF Transmit Interface Faults Data AIS Data or Alarm indication Signal When Data_FLT is s...

Страница 43: ...ith that time and date On power up an additional common equipment fault is also logged Flt1 to indicate the power up time and date So on power up the power down and power up times are logged as common equipment fault 0 and common equipment fault 1 Upon entering the stFaults level use the left and right arrow keys to move between the six fault groups and the CLEAR StFaults selections The time and d...

Страница 44: ...LAMP TEST Lamp test function used to illuminate all the front panel indicators for three seconds Press the ENTER key to turn on all of the front panel indicators for three seconds Address Parity Baud Rate The current modem address parity selection and selected baud rate of the modem is displayed This in only a monitor function No changes can be made from this menu On entry the currently set addres...

Страница 45: ...rate reassignments The modulator has four symbol rate filters Each filter is for a specific symbol rate The data rate and code rate for each filter must be established upon initial modulator installation and when circumstances indicate the need to do so Filters are designated as A B C and D To view the current filter assignments press the ENTER key when the Assign TX_Fltrs selection is displayed f...

Страница 46: ...v 3 15 Assign RX_Fltrs Receive filter display assignment utility Used to view current filter rate assignments and to make filter rate reassignments Refer to the previous text under Assign TX_Fltrs The receive filters assignments are basically identical ...

Страница 47: ...Operation SDM 309B Satellite Modem 3 16 MN U SDM309B Rev Figure 3 2 Menu Tree ...

Страница 48: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 17 Figure 3 3 Menu Tree ...

Страница 49: ...Operation SDM 309B Satellite Modem 3 18 MN U SDM309B Rev Figure 3 4 Menu Tree ...

Страница 50: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 19 Figure 3 5 Menu Tree ...

Страница 51: ...Operation SDM 309B Satellite Modem 3 20 MN U SDM309B Rev Figure 3 6 Menu Tree ...

Страница 52: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 21 Figure 3 7 Menu Tree ...

Страница 53: ...Operation SDM 309B Satellite Modem 3 22 MN U SDM309B Rev Figure 3 8 IF Loopback ...

Страница 54: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 23 Figure 3 9 RF Loopback ...

Страница 55: ...Operation SDM 309B Satellite Modem 3 24 MN U SDM309B Rev Figure 3 10 Interface Loopback ...

Страница 56: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 25 Figure 3 11 Baseband Loopback ...

Страница 57: ...ions stored fault functions or utility functions Use the right and left arrow keys to move from one selection to another when the desired function is displayed on line two you can enter that level by pressing the Enter key Once you have entered the functional level of your choice move to the desired function by using the right and left arrow keys Refer to the following text for information on indi...

Страница 58: ...or decrement the digit at the flashing cursor Press the ENTER key to execute the change Note The transmitter frequency is programmable within the specified range 50 90 MHz or 110 180 MHz in 2 5 KHz Steps When the transmitter frequency is changed the transmitter is automatically turned off to prevent the possible swamping of other channels To turn the transmitter on use the RF_OUT function RF_Out P...

Страница 59: ... 2 2 DEMOD Configuration RXA Receiver rate selection Select one of four predefined receiver decoder data rate combinations or a variable rate selection On entry the current receiver rate is displayed with the flashing cursor on the first character of the code rate on line one The data rate is displayed on line two Use the arrow keys to select one of four predefined rates Filters that are not prese...

Страница 60: ...p On entry the current programmed setting is displayed with a flashing cursor on the first character Use the right and left arrow keys to move the flashing cursor and the up and down arrow keys to increment and decrement the digit at the flashing cursor Select the number of seconds for the reacquisition mode form 0 to 999 seconds Press the ENTER key to execute the change SWP_CNTR Programs the swee...

Страница 61: ...Press the ENTER key to execute the change Indicates Test Mode configuration option These windows only show up when the Fast Acquisition has been turned on in the Utility menu 3 2 2 3 Interface Configuration INS_Clk Programs the interface plesiochronous buffer clock for Satellite internal external reference or Insert clock On entry the current setting of the plesiochronous buffer clock is displayed...

Страница 62: ...am of Interface loopback operation On entry the current status is displayed with the flashing cursor on the first character Use the arrow keys to select ON or OFF Press the ENTER key to execute the change Note Interface loopback only works when the TX data rate matches the RX data rate TX CODE Programs the transmitter for AMI HDB3 or B8ZS data On entry the current coding format is displayed Use th...

Страница 63: ...itor of AIS Data or None The data monitored for Receive Data is coming from the Satellite Refer to TXD_FLT for a description of the function choices On entry the current RX Data fault that is being monitored is displayed with the flashing cursor on the first character Use the arrow keys to select Data AIS or None Press the ENTER key to execute the change BUF_SIZE This configuration function is use...

Страница 64: ...splayed with the flashing cursor on the first character Use the arrow keys to select E1CCS E1CAS E1_IBS T1_IBS E1_31_TS T1 or T1ESF Press the ENTER key to execute the change DROP CHANNELS Programs the drop channels into the desired time slot from 1 to 31 for E1CCS E1_31_TS and E1CAS dropping time slot 0 is not allowed and from channels 1 to 24 for T1 and T1ESF Note The number of drop channels is d...

Страница 65: ...slot Use the up and down arrow keys to select the Terrestrial frame slot for each available Satellite bearer channel by incrementing or decrementing the digit at the flashing cursor Press the ENTER key to execute the change Scramblr Programs the modulator for scrambler On or Off On entry the current status of the scrambler is displayed with the flashing cursor on the first character Use the arrow ...

Страница 66: ...INTF transmitter interface faults RX_INTF receiver interface faults and ALARMS backward alarm indicators The current faults status is displayed on line two of the display in real time Faults status is display as plus or minus for each parameter monitored indicates that a fault exists and indicates that no fault exists To display labels for individual faults press the Enter key Use the left and rig...

Страница 67: ...ration menu the fault indicates a Data stable condition When AIS is selected fault indicates data is all 1 s Refer to Section 3 2 2 3 Interface Configuration for a detailed description of these faults DROP Drop Interface Hardware Fault Typically indicates that the drop interface PLL is not locked CLK_ACT Clock Activity fault Indicates there is no clock activity on the TX interface 3 2 4 5 RX_INTF ...

Страница 68: ... s stored faults status Flt0 Flt9 To display the faults status associated with the displayed time and date press the Enter key at this time you can use the right and left arrow keys to move the flashing cursor to the fault you wish to identify To clear the stored faults currently logged simply press the Enter key when the CLEAR StFaults selection is displayed Note Faults are stored in time sequenc...

Страница 69: ... line POW ADJ Modulator Power Adjust Offset Allows the operator to offset the modulator output power readout in the configuration menu This will be the highest modulator power that will be displayed and programmed This feature does not actually change the modulator power level The function is to change the actual reading to display an offset value in the monitor The modulator Power Offset can be s...

Страница 70: ...which indicates that the filter is not assigned On line two will be the data rate assigned to filter A Use the right and left arrow keys to see the assignments for filters B C and D TXB TXC and TXD If it is desired to change a filter assignment press the Enter key when the data for that filter is displayed Use the right and left arrow keys until the flashing cursor is at the parameter to be change...

Страница 71: ...Operation SDM 309B Satellite Modem 3 40 MN U SDM309B Rev Figure 3 12 Menu Tree ...

Страница 72: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 41 Figure 3 13 Menu Tree ...

Страница 73: ...Operation SDM 309B Satellite Modem 3 42 MN U SDM309B Rev Figure 3 14 Menu Tree ...

Страница 74: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 43 Figure 3 15 Menu Tree ...

Страница 75: ...Operation SDM 309B Satellite Modem 3 44 MN U SDM309B Rev Figure 3 16 Menu Tree ...

Страница 76: ...SDM 309B Satellite Modem Operation MN U SDM309B Rev 3 45 Figure 3 17 Menu Tree ...

Страница 77: ...Operation SDM 309B Satellite Modem 3 46 MN U SDM309B Rev ...

Страница 78: ...t monitoring and status gathering is provided All modem functions are accessible through a local front panel interface and a remote communications interface 4 1 2 Description of Options 4 1 2 1 Remote Interface All modem functions can be remotely controlled and monitored via a RS 485 optional RS 232C communications link The two wire half duplex RS 485 interface makes it possible to operate 255 mod...

Страница 79: ... Interfaces SDM 309B Satellite Modem 4 4 2 MN U SDM309B Rev RS 232C Configuration To configure the M C for RS 232C operation Install jumpers JP4 JP5 and JPX Remove jumpers JP1 JP2 and JP3 Connect JP7 to RS232 ...

Страница 80: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 3 Figure 4 1 Monitor Control Card ...

Страница 81: ...urrently assigned or used 4 1 2 3 Remote Address Each modem must be configured for one address between 1 and 255 to communicate using the established remote communications protocol Each modem on a common remote communications link RS 485 must have a distinct address Addresses are programmed by a switch pack SP2 on the M C module Addresses are binary coded numbers set at SP2 with switch 1 SP2 1 bei...

Страница 82: ...mit rate selected A 1 2 128Kbps TX_Freq Transmitter frequency 70MHz RF_Out RF Output OFF TX_Power Transmit Power Level 10dBm DifEncdr Differential Encoder ON CW_Mode Continuous Wave Mode OFF 4 1 2 6 Demodulator Decoder Defaults RXA Receive Filter A 1 2 decode rate 64Kbps RXB Receive Filter B 1 2 decode rate 256Kbps RXC Receive Filter C 1 2 decode rate 768Kbps RXD Receive Filter D 1 2 decode rate 2...

Страница 83: ... Monitor and Control module is built around the Intel 80C31 microcontroller operating at 5 5295 MHz The microsystem is designed to support 64K bytes of read only code memory and 64K bytes of random access data memory Of the 64K bytes data memory only 4K is used for RAM the remaining address is used for memory mapped I O Memory mapped I O includes real time clock memory a eight channel analog to di...

Страница 84: ...erfaces V 35 RS422 and G 703 The G 703 interface supports only the 1544 and 2048 data rate selections while all data rates are supported by both the V 35 and RS422 interfaces Data rate selection is done by installing a header on the interface card and connecting to the proper connector on the IBS subpanel Figure 4 5 Jumper Table describes the different interface header connections and shows the lo...

Страница 85: ...tellite Modem 4 4 8 MN U SDM309B Rev reference clock generated in the modem The interface will automatically select the internal clock if it detects a problem with the customer selected clock A fault will be signaled if this happens ...

Страница 86: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 9 Figure 4 2 IBS Interface Module ...

Страница 87: ...M C and Interfaces SDM 309B Satellite Modem 4 4 10 MN U SDM309B Rev Figure 4 3 IBS Interface Block Diagram ...

Страница 88: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 11 Figure 4 4 IBS Fault Tree ...

Страница 89: ...M C and Interfaces SDM 309B Satellite Modem 4 4 12 MN U SDM309B Rev Figure 4 5 Jumper Table ...

Страница 90: ...n and separates the user data from the ESC channel If the Demux is receiving a correct signal and synchronized it will signal the modem that the multiplex system is locked Muxlock and passing data This is indicated by interrogating the modem and by a green Light Emitting Diode LED on the Interface and is fed into the receive fault tree per IESS 309 Under certain fault conditions defined by IESS 30...

Страница 91: ...imum of 3 preferably 4 samples of each bit of the TD signal are required to reliably reproduce the signal at the far end RD Therefore the maximum RS 232 data rate which will provide for asynchronous communications is approximately 1 2000 times the customer data rate For example if the modem data rate is 64 KBPS the TD signal would be sampled at a rate of 64000 512 which is equal to 125 BPS The min...

Страница 92: ...FAULT DEM_FLT 33 4 2 1 8 IBS Interface Specification Common Interface Specifications Transmit Clock Reference TX_Terrestrial derived from TT SCTE or SD Internal 10 5 accuracy External Reference differential receiver Buffer Clock Reference TX_Terrestrial derived from TT SCTE or SD Satellite bypass External Reference differential receiver Internal 10 5 accuracy Modulator Fault Open collector output ...

Страница 93: ... into 100 Amplitude CTS DSR RLSD 10 5 V into 5000 2000 Impedance RD SCR SCT 100 20 differential Impedance SD SCTE 100 10 differential Impedance RTS 5000 2000 2500 pf DC Offset RD SCR SCT 6 V max 1000 ohm termination to ground Polarity SD SCT SCTE RD SCR True when B positive wrt A False when A positive wrt B Polarity RTS CTS DSR RLSD True when 3V wrt ground False when 3V wrt ground Phasing SCTE SCR...

Страница 94: ... these connectors are shown in Figure 4 6 Figure 4 7 shows the schematic diagram for the IBS Interface Breakout panel The assembly number for the breakout panel is AS 1030 Table 4 1 Ref Desig Connector Type Name Pinout Section J1 50 PIN D IBS TERR INTERFACE 4 2 1 9 1 J2 37 PIN D RS422 INTERFACE 4 2 1 9 2 J3 CNV 35 PIN V 35 INTERFACE 4 2 1 9 3 J4 25 PIN D ENGINEERING SERVICE CHANNEL 4 2 1 9 4 J5 15...

Страница 95: ...M C and Interfaces SDM 309B Satellite Modem 4 4 18 MN U SDM309B Rev Figure 4 6 IBS Break Out Panel ...

Страница 96: ...D 7 RECEIVE DATA RD A RD B 39 40 SERIAL CLOCK RX RECEIVER TIMING SCR RT A SCR RT B 23 24 RS422 RX OCTET RS422RXO A RS422RXO B 8 9 SERIAL CLOCK TX EXT TERMINAL TIMING SCTE TT A SCTE TT B 12 13 REQUEST TO SEND RTS A RTS B 45 29 RECEIVE LINE SIGNAL DETECT RECEIVER READY RLSD RR A RR B 46 30 RS422 TX OCTET RS422TXO A RS422TXO B 14 15 CLEAR TO SEND CTS A CTS B 47 31 DATA SET READY DATA MODE DSR DM A DM...

Страница 97: ...A MODE DM A DM B 11 29 4 2 1 9 3 V 35 Interface J3 The V 35 interface is provided of a 35 pin CNV connector accessible from the front of the breakout panel Screw locks are provided for mechanical security of the mating connector Signal Function Name Pin Number GROUND GND A B REQUEST TO SEND RST C CLEAR TO SEND CTS D DATA SET READY DSR E RECEIVE LINE SIGNAL DETECT RLSD F SEND DATA SD A SD B P S REC...

Страница 98: ... for mechanical security of the mating connector Signal Function Name Pin Number GROUND GND 2 4 RECEIVE DATA T1E1_RD A T1E1_RD B 3 11 SEND DATA T1E1_SD A T1E1_SD B 1 9 EXTERNAL CLOCK EXC A EXC B 7 8 4 2 1 9 6 External Reference Clock J6 This connector is the interface for the unbalanced external reference clock input To activate this connector SW1 must be in the UNBAL position If the balanced exte...

Страница 99: ...f the balanced Send Data input is to be used SW3 must be in the BAL position Switch 3 is located on the front panel to the right of the receive data input 4 2 1 9 9 Alarm Outputs TB1 The alarm outputs are provided on a 8 position terminal block located on the front panel of the breakout panel Signal Function Name Pin Number GROUND GND 1 5 PRIMARY ALARM PRI_COM PRI_NO PRI_NC 2 3 4 SECONDARY ALARM S...

Страница 100: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 23 Figure 4 7 IBS Interface Breakout Panel Schematic Diagram ...

Страница 101: ...interface see Section 4 1 M C of the modem manual Selection is made by choosing the appropriate Terrestrial Interface under interface configuration Also there are jumpers on the 1455 PWB that must be selected to determine T1 or E1 operation Refer to Figure 4 11 for jumper selection Selection of the Transmit and Receive data rates may be made in 64 Kbit s increments and may be independent of each o...

Страница 102: ...ecovered clock from the data interface If no valid input signal is present the interface will fall back to a 10 5 accuracy reference clock generated in the modem and transmit a valid IESS 308 framing pattern This will keep the link open to the far end A fault will be signaled if this happens The transmit data will be replaced with an all ones pattern Alarm Indication Signal or AIS in the event of ...

Страница 103: ...nt provided by the modem internal clock These are stored in battery backed RAM The user will normally select to have the data clocked out of the buffer by the recovered clock from the Receive Data Input in order to synchronize the Receive data output with the satellite data The user may select from 2 other clock sources as a backup either a user supplied External reference clock or the internal cl...

Страница 104: ... Modem M C and Interfaces MN U SDM309B Rev 4 4 27 of the events which cause a secondary alarm The modem may be interrogated from the front panel or using the RS 485 or RS 232 interface to identify the cause of the alarm ...

Страница 105: ...M C and Interfaces SDM 309B Satellite Modem 4 4 28 MN U SDM309B Rev Figure 4 8 Drop and Insert Channel Unit ...

Страница 106: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 29 Figure 4 9 Drop and Insert Block Diagram ...

Страница 107: ...M C and Interfaces SDM 309B Satellite Modem 4 4 30 MN U SDM309B Rev Figure 4 10 Drop Insert Fault Tree ...

Страница 108: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 31 Figure 4 11 Drop Insert Jumper Table ...

Страница 109: ... RX RS 232 DATA TERESTXDAT TERESRXDAT 5 7 RS 232 DATA SET READY DSR 48 PRIMARY FAULT RELAY PRI COM PRI NC PRI NO 10 Note 1 27 43 SECONDARY FAULT RELAY SEC COM SEC NC SEC NO 11 Note 1 28 44 MODULATOR FAULT MF 49 Note 2 DEMODULATOR FAULT DF 33 Note 2 RESERVED 3 Notes 1 ALARM Relay contacts named for normal No Fault condition xx COM connected to xx NC if no fault 2 SIGNALS MF DF and DMA are Open Coll...

Страница 110: ...ne Code Selectable AMI B8ZS HDB3 Jitter Attenuation T1 per AT T 43802 T1 per CCITT G 824 E1 per CCITT G 823 Transmit Clock Reference Normal derived from Drop SD Internal 10 5 accuracy External RS 422 Input Plesiochronous Buffer Included in receive path Buffer Clock Reference Derived from Insert Input External RS 422 Internal Buffer Depth T1 T1_ESF E1_CCS E1_IBS E1_31_TS 1 2 4 6 8 12 24 or 32 msec ...

Страница 111: ...n of these connectors are shown in Figure 4 12 Table 4 2 Breakout Panel Connectors Ref Desig Connector Type Name Pinout Section J1 15 PIN D DROP DATA INPUT 4 2 2 10 1 J2 15 PIN D DROP DATA OUTPUT 4 2 2 10 2 J3 15 PIN D INSERT DATA INPUT 4 2 2 10 3 J4 15 PIN D INSERT DATA OUTPUT 4 2 2 10 4 J5 BNC DROP DATA INPUT 4 2 2 10 5 J6 BNC DROP DATA OUTPUT 4 2 2 10 6 J7 BNC INSERT DATA INPUT 4 2 2 10 7 J8 BN...

Страница 112: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 35 Figure 4 12 Drop and Insert Break Out Panel ...

Страница 113: ...l switch information 4 2 2 10 2 Drop Data Output J2 The balanced Drop Data Output signals are provided on a 15 pin D female connector accessible from the front of the breakout panel Screw locks are provided for mechanical security of the mating connector Signal Function Name Pin Number GROUND GND 2 4 DROP DATA OUTPUT DDO A DDO B 1 9 DROP DATA OUTPUT DDO A DDO B 3 11 Note The drop data output signa...

Страница 114: ...ignal on J5 is selected by SW1 Refer to Section 4 2 2 11 1 for further information on selecting the balanced or unbalanced drop data input signal 4 2 2 10 6 Drop Data Output J6 This connector is the interface for the unbalanced drop data output The unbalanced drop data output signal on J6 is selected by SW1 Refer to Section 4 2 2 11 2 for further information on selection of the balanced or unbalan...

Страница 115: ...RRXDAT 3 REQUEST TO SEND RTS 4 CLEAR TO SEND CTS 5 DATA SET READY DSR 6 Note RTS and CTS are looped together on the connector 4 2 2 10 11 Faults J11 The faults are provided on an eight position terminal block located on the front of the breakout panel Signal Function Name Pin Number GROUND GND J11 1 J11 5 PRIMARY COMMON PRI_COM J11 2 PRIMARY NORM OPEN PRI_NO J11 3 PRIMARY NORM CLOSED PRI_NC J11 4 ...

Страница 116: ...input signal and the DB15 connector has the balanced input signal To use the BNC connector input SW1 position 1 2 must be closed close to PCB and SW1 position 3 4 must be open away from PCB To use the DB15 connector input SW1 position 1 2 must be open and SW1 position 3 4 must be closed The switch pack is located on the rear of the breakout panel 4 2 2 11 2 Drop Data Output The drop data output si...

Страница 117: ...way from PCB To use the DB15 connector input SW3 position 1 3 must be open and SW3 position 2 4 must be closed 4 2 2 11 6 Drop Output Insert Input SW4 When the Drop Data Output is to be connected directly to the Insert Data Input on a single breakout panel the loop function may be used Switch 4 in the UP position eliminates the need for an external cable from the Drop Data Output to the Insert Dat...

Страница 118: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 41 Figure 4 13 Rear Panel Switch Diagram ...

Страница 119: ... 2 Switch Position 1 2 3 4 UNBALANCED IDI CLOSED CLOSED OPEN OPEN BALANCED IDI OPEN OPEN CLOSED CLOSED Switch Position 5 6 7 8 UNBALANCED IDO CLOSED CLOSED OPEN OPEN BALANCED IDO OPEN OPEN CLOSED CLOSED Switch 3 Switch Position 1 2 3 4 UNBALANCED EXC CLOSED OPEN CLOSED OPEN BALANCED EXC OPEN CLOSED OPEN CLOSED Switch 4 Drop Data Output Insert Input LOOPBACK SWITCH POSITION UP NORMAL SWITCH POSITIO...

Страница 120: ...SDM 309B Satellite Modem M C and Interfaces MN U SDM309B Rev 4 4 43 Figure 4 14 Drop and Insert Schematic Diagram ...

Страница 121: ...M C and Interfaces SDM 309B Satellite Modem 4 4 44 MN U SDM309B Rev Figure 4 15 Drop Insert Daughter Board Schematic Diagram ...

Страница 122: ...or where it is not required to synchronize with a local clock The disadvantage of the master slave application is that the signal received at the slave station is subject to doppler shift Note The length of the buffer at the master end will need to be twice the length that is normally required since it will be compensating for the doppler shift on the outward and return paths 4 3 1 1 Master Slave ...

Страница 123: ...AL Modem Settings Slave TX_CLOCK TX_TERR BUFF_CLK SATELITE RX_CLOCK NORMAL 4 3 1 4 Master Slave External Station Clock Clock must be looped externally at slave end For RS422 and V 35 see notes in previous example Modem Settings Master RX_CLOCK NORMAL TX_CLOCK EXT_REF BUFF_CLOCK EXT_REF EXT_REF SET TO FREQUENCY OF STATION CLOCK Modem Settings Slave TX_CLOCK TX_TERR BUFF_CLK SATELITE RX_CLK NORMAL E...

Страница 124: ...matically 4 3 2 1 Master Master Customer Clock Modem Settings Master TX_CLOCK TX_TERR BUFF_CLK TX_TERR RX_CLK NORMAL EXT_REF N A 4 3 2 2 Master Master Station Clock Care should be taken when using this mode Make sure that the station clock is also used to synchronize the transmit data Phasing problems may also occur between the transmit data and the station clock input and for this reason it is be...

Страница 125: ... Differential Encoder 3 The Convolutional Encoder 4 The I Q Nyquist Filters 5 The Modulator 6 The Output Amplifier 7 The RF Synthesizer 8 The Clock Synthesizer A block diagram of the modulator is shown in Figure 5 2 A detailed description of the subSections appears in Section 5 1 3 5 1 2 Specifications Modulation type QPSK BPSK optional Frequency Range 50 to 90 MHz or 100 to 180 MHz Frequency Sele...

Страница 126: ...m out of band Output Power Level Range 5 to 30 dBm Output Power Adjustment 0 5 dB Step Size Output Stability 5 dB over 5 to 25 dBm 1 dB over 25 to 30 dBm Output Impedance 75 50 Optional Output Return Loss 20 dB Minimum Differential Encoding 2 Phase or None FEC Encoding Convolutional Rate 7 8 3 4 or 1 2 I O Connector DIN 96 pin ...

Страница 127: ...SDM 309B Satellite Modem Theory of Operation MN U SDM309B Rev 5 5 3 Figure 5 1 Modulator Card ...

Страница 128: ...Theory of Operation SDM 309B Satellite Modem 5 5 4 MN U SDM309B Rev Figure 5 2 Modulator Block Diagram ...

Страница 129: ...SDM 309B Satellite Modem Theory of Operation MN U SDM309B Rev 5 5 5 Figure 5 3 Modulator Output Spectral Occupancy ...

Страница 130: ...The Scrambler is according to CCITT V 35 It provides a pseudo random characteristic to the data stream for dispersal of the transmitted energy independent of the data pattern It is programmable on or off The Data passes to the Convolutional Encoder 3 The Convolutional Encoder generates the parity bits from the input data stream that allows for error correction at the far end of the link The rate o...

Страница 131: ...nel units and could operate at data rates of 64 kbs to 2048 kbs The M C firmware used with the 0701 board is version 2 XX If a customer needs to replace a 0701 decoder board they will receive the 2133 Viterbi board and must upgrade the M C firmware The 0949 board and the 2133 board can operate from 9 6 kbs BPSK to 8 Mbs Firmware is backward compatible between the 0949 and the 2133 boards but older...

Страница 132: ...rbi Decoder Specifications Bit Error Rate See Figure 5 8 Maximum Data Rate 6 4 Mb s Rate 1 2 9 5 Mb s Rate 3 4 Synchronization Time 8000 Bits max Output Fault Indicators Activity Detection of I Q Data Sign Bits and Descrambler Data Raw BER Detection From 0 to 255 Bits Out of 1024 Samples Differential Decoding 2 phase or none Constant Length 7 I O Connector DIN 96 pin ...

Страница 133: ...SDM 309B Satellite Modem Theory of Operation MN U SDM309B Rev 5 5 9 Figure 5 4 Viterbi Decoder AS 0701 ...

Страница 134: ...Theory of Operation SDM 309B Satellite Modem 5 5 10 MN U SDM309B Rev Figure 5 5 Viterbi Decoder AS 0949 ...

Страница 135: ...SDM 309B Satellite Modem Theory of Operation MN U SDM309B Rev 5 5 11 Figure 5 6 Viterbi Decoder AS 2133 ...

Страница 136: ...Theory of Operation SDM 309B Satellite Modem 5 5 12 MN U SDM309B Rev Figure 5 7 Viterbi Decoder Block Diagram ...

Страница 137: ...SDM 309B Satellite Modem Theory of Operation MN U SDM309B Rev 5 5 13 Figure 5 8 Typical Decoder BER Performance ...

Страница 138: ...ck The Symbol Rate Clock is compared with the Quantized I and Q channel data to generate a phase error term The error term is scaled and integrated before it drives the VCXO on the phase locked loop thus closing the outer loop and driving the Symbol Rate Clock to synchronize to the incoming Symbols The I and Q channel data is sampled and converted to 3 bit quantized R0 and R1 parallel code bits fo...

Страница 139: ...ronization of the decoder The output data may then be descrambled and differentially decoded Both of these processes are optional and may be selected by the user locally or remotely The data out of the differential decoder is sent to the interface card for formatting and output The synchronization signal is used for Lock Detect and sent to the M C The Raw BER count is generated from the minimum an...

Страница 140: ... Method Synthesized Frequency Step Size 2 5 KHz Channel Spacing 7 Times the Data Rate Divided by the Encoding Rate Input Level Desired Carrier 55 to 30 dBm Input Overload 0 dBm max Input Impedance 75 W 50 Optional Input Return Loss 20 dB minimum Filtering Nyquist 8 pole 1 of 4 selectable Image Rejection 40 dB minimum Symbol Rate Range 9 1 to 3152 Kb s I O Connector DIN 96 pin ...

Страница 141: ...SDM 309B Satellite Modem Theory of Operation MN U SDM309B Rev 5 5 17 Figure 5 9 Demodulator Card ...

Страница 142: ...Theory of Operation SDM 309B Satellite Modem 5 5 18 MN U SDM309B Rev Figure 5 10 Demodulator Block Diagram ...

Страница 143: ...nd Q channel baseband signals These two signals are amplified and filtered in the Nyquist Filters 4 These filters are matched filters to those of the transmitter resulting in optimal detection of the transmitted data In addition they effectively remove adjacent channels which could corrupt the detection process The signal is amplified to the final level in the Baseband Amplifier 5 At this point th...

Страница 144: ...the time set for reacquisition 0 999 seconds the modem will terminate the reacquisition mode and begin sweeping the full range of plus minus 30 KHz The reacquisition mode is intended to reduce the time for reacquisition at lower symbol rates The following guidelines should be applied when using the re acquisition mode 1 The time specified for re acquisition must be multiples of 10 of the total nom...

Страница 145: ...de can be much faster than the Fast Acquisition Mode Due to the reduced speed of the lower data rates up to 30 seconds in fast acquisition the customer has the option of controlling the sweep functions There are four additional functions in the front panel menu that are directly related to the directed sweep mode There is a monitor function SWP_FREQ that detects the current sweep frequency and the...

Страница 146: ... front panel Sections 3 1 4 and 3 2 1 The CONFIG menu also allows the operator to set the output level turn the output ON or OFF set the scrambler differential encoder clock source and gives access to the test modes for system check out Available test modes are RF loopback BB loopback and CW mode After the output frequency and level is set the output is to be turned ON 6 1 3 Demodulator Checkout T...

Страница 147: ...specific code rate Once the demodulator has locked to the incoming signal the MONITOR menu will display signal level raw BER corrected BER and Eb N0 Sections 3 1 5 and 3 2 4 These functions are not displayed until the demodulator is locked to a carrier A typical eye pattern with noise and without noise is shown in Figure 6 3 and a typical constellation with noise and without noise is shown in Figu...

Страница 148: ...SDM 309B Satellite Modem Maintenance MN U SDM309B Rev 6 6 3 Figure 6 1 Typical Output Spectrum ...

Страница 149: ...Maintenance SDM 309B Satellite Modem 6 6 4 MN U SDM309B Rev Figure 6 2 Output Spectrum With Noise ...

Страница 150: ...9 0 9 0 9 0 7 2 9 0 6 6 10 0 9 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 12 8 12 8 11 0 12 8 10 3 13 5 13 3 13 3 13 3 11 5 13 3 10 9 14 0 13 8 13 8 13 8 12 1 13 8 11 4 14 5 14 3 14 3 14 3 12 6 14 3 11 9 15 0 14 9 14 9 14 9 13 1 14 9 12 4 15 5 ...

Страница 151: ...Maintenance SDM 309B Satellite Modem 6 6 6 MN U SDM309B Rev Figure 6 3 Typical Eye Patterns ...

Страница 152: ...SDM 309B Satellite Modem Maintenance MN U SDM309B Rev 6 6 7 Figure 6 4 Typical Eye Constellations ...

Страница 153: ...ot equalized TP4 Q Analog Data Eye Pattern Approximately 1 4 V P P between eye sample points TPG2 Ground TP6 I Analog Data Eye Pattern Approximately 1 4 V P P between eye sample points TP17 I channel data TTL level data that is output from the last register in the digital filter The I channel activity fault is monitoring the line TP18 Q channel data TTL level data that is output from the last regi...

Страница 154: ...P P at the center of the eye crossing The DC offset is about 2 4V TP2 Q THRS Q channel threshold voltage 2 9V DC TP3 I THRS I channel threshold voltage 2 9V DC TP4 I EYE pattern Level is 1V P P at the center of the eye crossing The DC offset is about 2 4V TP5 Q CLK THRS Q channel clock threshold 2 to 3V DC TP6 Q CLK THRS Q channel clock threshold 2 to 3V DC TP7 I CLK THRS I channel clock threshold...

Страница 155: ... 50 duty cycle random TTL data TP4 Symbol Clock Result of the symbol clock recovery loop in the demod processor Section TP5 Not used at this time TP6 Not used at this time TPG Ground Test Point TP7 Sync Change out Result of Viterbi decoder initiating ambiguity resolution change TP8 Decoder Synchronization Result of the Viterbi decoder achieving synchronization TP9 Decoder Data Data out of the deco...

Страница 156: ... Random TTL pulses One pulse for every I channel or Q channel error TPG Ground Test Point TP4 I Channel Data Result of the hard decision interface 50 duty cycle random TTL data TP5 Symbol Clock Result of the symbol clock recovery loop in the demod processor Section TP6 Q Channel Data Result of the hard decision interface 50 duty cycle random TTL data TP7 Data Clock VCO 8 MHz to 18 MHz TTL master c...

Страница 157: ...P2 GND Ground Test Point TP3 VIT LOCK Viterbi lock Result of the decoder and clock synchronization and AGC leveling TP4 DATA CLK Data Clock Result of the data clock recovery loop in the demod processor Section TP8 SYM CLK Symbol Clock Result of the symbol clock recovery loop in the demod processor Section Figure 6 9 ...

Страница 158: ...6 2 for available data rates for the SDM 309 Or refer to Intelsat document IESS 309 for available data rates for the SDM 309 modem In the SDM 309 the internal reference is changed to account for the IBS overhead of 16 15 An SDM 309 would be programmed for the input data rate to the channel unit The modem accounts for the overhead because of the change in internal reference Verify the frequency of ...

Страница 159: ...e RF_SYN Demodulator synthesizer is faulted Return the demodulator for repair DATA_CLK Indicates a loss of lock on the reference of the demodulator clock recovery oscillator Return the decoder card for repair I_CHANNL Indicates a loss of activity in the I channel of the quadrature demodulator Typically indicates a problem in the modulator side of the circuit Check for proper RF input to the demodu...

Страница 160: ...ower supply fault Use the same procedure as with 12 volt fault 5 VOLT 5 volt power supply fault Use the same procedure as with 12 volt fault The 5 volt supply requires a minimum load of 1A This is accomplished with the M C card and one other card being plugged into the chassis CONTROLR Controller fault Indicates a loss of power in the M C card This fault is shown only in the stored fault menu INTR...

Страница 161: ...nal SCT clock source with an accuracy of 10 5 6 3 2 Receive Overhead Framing Unit Faults Fault Possible Problem And Action BUF_UNFL Buffer Underflow the plesiochronous buffer has underflowed As buffer underflow is normally a momentary fault there are clock problems if this is continuously present this is included in this Section to be consistent with the fault reporting system and be correctly reg...

Страница 162: ...s selected a demod fault Data Clk_Syn fault will probably occur If the Insert clock is selected a mod fault TX_Clk_Syn fault will probably occur RX_PLL IBS M1200P Only Indicates a loss of lock on the reference of the interface receive clock recovery oscillator Return the interface card for repair BUFF_CLK Loss of activity on the selected buffer clock source The modem will fallback to the satellite...

Страница 163: ...285 0 286 0 286 4 287 0 288 0 289 0 289 6 290 0 291 0 291 2 292 0 292 8 293 0 294 0 294 4 295 0 296 0 297 0 297 6 298 0 299 0 299 2 300 0 300 8 301 0 302 0 302 4 303 0 304 0 305 0 305 6 306 0 307 0 307 2 308 0 308 8 309 0 310 0 310 4 311 0 312 0 313 0 313 6 314 0 315 0 315 2 316 0 316 8 317 0 318 0 318 4 319 0 320 0 321 0 321 6 322 0 323 0 323 2 324 0 324 8 325 0 326 0 326 4 327 0 328 0 329 0 329 ...

Страница 164: ...24 0 826 0 828 0 830 0 832 0 834 0 836 0 838 0 840 0 842 0 844 0 846 0 848 0 850 0 852 0 854 0 856 0 858 0 860 0 862 0 864 0 866 0 868 0 870 0 872 0 874 0 876 0 878 0 880 0 882 0 884 0 886 0 888 0 890 0 892 0 894 0 896 0 898 0 900 0 902 0 904 0 906 0 908 0 910 0 912 0 914 0 916 0 918 0 920 0 922 0 924 0 926 0 928 0 930 0 932 0 934 0 936 0 938 0 940 0 942 0 944 0 946 0 948 0 950 0 952 0 954 0 956 0...

Страница 165: ...0 1952 0 1956 0 1960 0 1964 0 1968 0 1972 0 1976 0 1980 0 1984 0 1988 0 1992 0 1996 0 2000 0 2004 0 2008 0 2012 0 2016 0 2020 0 2024 0 2028 0 2032 0 2036 0 2040 0 2044 0 2048 0 Notes 1 Programmed variable rates are listed above from 64 Kb s to 2 048 Mb s or Single Data Rate option is available 2 Maximum 1 2 rate is 2048 Kb s 3 Maximum 3 4 rate is 2048 Kb s ...

Страница 166: ...SDM 309B Satellite Modem Maintenance MN U SDM309B Rev 6 6 21 Figure 6 10 Rear View Without Cover ...

Страница 167: ...evision is stamped on the board as is the serial number EFData tracks the hardware by the assembly revision and serial number Data rate dependent hardware is labeled with the associated symbol rate on a label on the board When replacing a plug in module care must be taken to assure that the proper daughter card is used Refer to the individual Sections on each module for location of the configurati...

Страница 168: ...ber AS 0701 Dash Description 1 SDM 308 IDR 2 SDM 309 IBS Viterbi Decoder Base Part Number AS 0949 NO DASH NUMBERS Viterbi Decoder Base Part Number AS 2133 NO DASH NUMBERS Interfaces Filter Cards Part Description AS 1010 1011 IBS M1200P Channel Unit Interface AS 1010 1455 Drop Insert Channel Unit Interface AS 0930 2 Modulator Daughter Filter Card Variable Rate AS 0715 X Modulator Daughter Filter Ca...

Страница 169: ...1 Fixed Rate Filters 1 Turn off modem power switch 2 Remove the modulator card 0773 Black card ejectors 3 With a phillips screwdriver remove the two 2 screws holding the daughter board in place See Figure A 1 for location of the hardware 4 Remove the daughter card 0715 from the modulator Figure A 3 and Figure A 4 are fixed rate filter cards 5 Install the replacement daughter card 0715 so that both...

Страница 170: ...e assignment of a fixed rate filter in the Utility menu is automatically read by the M C when power is turned on Also each daughter card is labeled with the filter assignment A B C and D and the associated symbol rate Example the label for a 64KBPS 7 8 rate QPSK filter is 36 57 15 Go to the Config menu on the front panel and select the TX and RX rate that is desired and turn ON the RF output The h...

Страница 171: ...SDM 309B Satellite Modem Data Rates and Filters MN U SDM309B Rev A 3 Figure A 1 Modulator Filter Card Change ...

Страница 172: ...Data Rates and Filters SDM 309B Satellite Modem A 4 MN U SDM309B Rev Figure A 2 Demodulator Filter Card Change ...

Страница 173: ...SDM 309B Satellite Modem Data Rates and Filters MN U SDM309B Rev A 5 Figure A 3 Fixed Rate Modulator Filter ...

Страница 174: ...Data Rates and Filters SDM 309B Satellite Modem A 6 MN U SDM309B Rev Figure A 4 Fixed Rate Demodulator Filter ...

Страница 175: ...SDM 309B Satellite Modem Data Rates and Filters MN U SDM309B Rev A 7 Figure A 5 Variable Rate Modulator Filter ...

Страница 176: ...Data Rates and Filters SDM 309B Satellite Modem A 8 MN U SDM309B Rev Figure A 6 Variable Rate Demodulator Filter ...

Страница 177: ...SDM 309B Satellite Modem Data Rates and Filters MN U SDM309B Rev A 9 ...

Страница 178: ...s link is operated in a half duplex mode Communcations on the remote link are initiated by a remote controller or terminal The SDM308 5 never transmits data on the link unless it is commanded to do so 3 0 Message Structure The ASCII character format used requires 10 or 11 bits character 1 start bit 7 information bits 1 parity bit odd even and 1 or 2 stop bits Messages on the remote link fall into ...

Страница 179: ...d must be in the range of 1 to 255 Note add is used to indicate a valid 1 to 3 character device address in the range between 0 and 255 3 3 Command Responses The command response portion of the message contains a variable length character sequence which conveys command and response data If a satellite modem receives a message addressed to it which does not match the established protocol or can not ...

Страница 180: ...tput ON OFF Command add RF_xxx cr xxx ON or OFF Response add RF_xxx cr lf Status Only add RF_ cr Response add RF_xxx cr lf 4 1 3 Modulator Rate The modulator has four symbol rate filters Each filter is for a specific symbol rate The data rate and coder rate for each filter must be established upon initial modulator installation and when circumstances indicate the need to do so Filters are designat...

Страница 181: ...eplaced by N A to indicate no assignment Example Command add AMRx_N A cr Response add AMRx_N A cr lf 4 1 3 2 Select Modulator Rate Command add SMRx_ cr x A B C or D Filter designator Response add SMRx_ cr RF_OFF cr lf Setting the modulator turns off the RF transmitter Status Only see MR command Note If the MODEM is commanded to a filter rate which is not assigned N A the error 2 message will be re...

Страница 182: ...rements for 140MHz modulator snn n 20 0 to 30 0 in 0 5dB increments for 70MHz modulator Note Must be within 25 0dB of the modulator power offset value see MPO_ for the 140MHz modulator and within 10 0dB of the modulator power offset for the 70MHz modulator Status Only add MOP_ cr Response add MOP_snn n cr lf 4 1 6 Differential Encoder Enable Command add DENC_xxx cr xxx ON or OFF Response add DENC_...

Страница 183: ...mmed rates available by using the filter rate assignment commands These rates are selected using the standard sDRx_ commands Modems that have the variable rate option installed will also respond to the special sDRV_ command This allows for truly variable rate control while maintaining compatibility with previous systems 4 2 2 1 Demodulator Filter Rate Assignment Command add ADRx_nnn_mmmm m cr x A ...

Страница 184: ...ponse add DDEC_xxx cr lf Status Only add DDEC_ cr Response add DDEC_xxx cr lf 4 2 4 RF Loop back ON OFF Command add RFL_xxx cr xxx ON or OFF Response add RFL_xxx cr lf Status Only add RFL_ cr Response add RFL_xxx cr lf 4 2 5 IF Loop back ON OFF Command add IFL_xxx cr xxx ON or OFF Response add IFL_xxx cr lf Status Only add IFL_ cr Response add IFL_xxx cr lf 4 2 6 Bit Error Rate Threshold Command a...

Страница 185: ...is set to less than 50khz acquisition will be dictated by the directed sweep specifications and the fast acquisition algorithm will not be used The directed sweep functions are also available when fast acquisition is enabled Directed sweep provides three commands for manipulating the acquisition process These commands are sCF_ sweep center frequency sWR_ sweep range and sD_ sweep direction Command...

Страница 186: ...r lf nnnnn 0 to 50000 Note This command is only valid when fast acquisition is enabled See the FAM_ command definition 4 2 11 Sweep Direction This command sets the direction of the sweep travel sets incremental sweep while sets decremental sweep Command add SD_s cr lf Response add SD_s cr lf Status Only add SD_ cr lf Response add SD_s cr lf s or direction of sweep travel during acquisition Note Th...

Страница 187: ...se Band Loop back ON OFF Command add BBL_xxx cr xxx ON or OFF Response add BBL_xxx cr lf Status Only add BBL_ cr Response add BBL_xxx cr lf 4 3 5 Interface Coding Format Transmit AMI HDB3 B8ZS Command add ICFT_xxxx cr xxxx AMI HDB3 or B8ZS Response add ICFT_xxxx cr lf Status Only add ICFT_ cr Response add ICFT_xxxx cr lf 4 3 6 Interface Coding Format Receive AMI HDB3 B8ZS Command add ICFR_xxxx cr ...

Страница 188: ... command is used to select the reading of frame error data or 2047 pattern error data Command add IRE_xxxx cr xxxx FRM FRAME or 2047 Response add IRE_xxxx cr lf Status Only add IRE_ cr Response add IRE_xxxx cr lf 4 3 11 Interface Buffer Center This command centers the interface buffer Command add IBC_ cr Response add IBC_ cr lf 4 3 12 Interface Buffer Size Command add IBS_nn cr Response add IBS_nn...

Страница 189: ...om satellite or none flagged Status Only add RDF_ cr Response add RDF_xxxx cr lf 4 3 15 Drop Data Format Command add DDF_xxxxxx cr Response add DDF_xxxxxx cr lf xxxxx T1 T1ESF T1IBS E1CCS E1CAS E1IBS or E131TS Status Only add DDF_ cr Response add DDF_xxxxxx cr lf 4 3 16 Insert Data Format Command add IDF_xxxxxx cr Response add IDF_xxxxxx cr lf xxxxx T1 T1ESF T1IBS E1CCS E1CAS E1IBS or E131TS Statu...

Страница 190: ...status response returns progamming information for 1 to N drop channels This command is not valid if the drop data format is specified to be T1IBS or E1IBS Also this command is not valid when the drop data format is specified as E1CAS and the modulator data rate is set to 1920 0Kbps 4 3 19 Insert Channels Assignment Command add ICA_ii cc cr Response add ICA_ii cc cr lf ii 1 to N over the satellite...

Страница 191: ...y not be specified when the insert data format is specified to be E1CAS This command is not valid if the insert data format is specified to be T1IBS or E1IBS Also this command is not valid when the insert data format is specified as E1CAS and the demodulator data rate is set to 1920 0Kbps 4 4 System Configuration Commands 4 4 1 Time Of Day Command add TIME_hh mmxx cr hh hours mm minutes Response a...

Страница 192: ...ly mode is selected receive faults are inhibited and when receive only mode is selected transmit faults are inhibited Command add MOM_xxxxxxx cr Response add MOM_xxxxxxx cr lf xxxxxxx TX_ONLY RX_ONLY or DUPLEX Status Only add MOM_ cr Response add MOM_xxxxxxx cr lf 5 0 Status Commands Responses 5 1 Configuration Status 5 1 1 Modulator Coder Configuration Status The Modulator Coder configuration sta...

Страница 193: ...ency BBL_xxx cr Base Band Loop back ON OFF ILB_xxx cr Interface Loop back ON OFF ICFT_xxxx cr Coding Format Transmit AMI HDB3 B8ZS ISP_xxx cr Substitution Pattern ON OFF TDF_xxxx cr Transmit Data Fault NONE DATA AIS DDF_xxxxxx cr Drop Data Format BDCA_dd cc_dd cc cr Bulk Drop Channels Assignment RF_xxx cr lf RF output ON OFF 5 1 3 Demodulator Decoder Configuration Status The Demodulator Decoder co...

Страница 194: ...Reference Frequency BBL_xxx cr Base Band Loop back ON OFF ILB_xxx cr Interface Loop back ON OFF ICFR_xxxx cr Coding Format Receive AMI HDB3 B8ZS RDF_xxxx cr Receive Data Fault NONE DATA AIS IRE_xxxx cr Interface Read Error Select FRM 2047 IDF_xxxxxx cr Insert Data Format IBS_nnnnnn cr Interface Buffer Size BICA_dd cc_dd cc cr Bulk Insert Channels Assignment FAM_xxx cr Fast Acquisition Mode SCF_snn...

Страница 195: ...MFS_ cr DMD_xxx cr Demodulator FLT OK MOD_xxx cr Modulator FLT OK CEQ_xxx cr Common Equipment FLT OK ITX_xxx cr Interface Transmit Side OK FLT IRX_xxx cr lf Interface Receive Side OK FLT 5 3 Modulator Status The modulator status is returned as a block of data which indicates general status information Command add MS_ cr Response add MS_ cr RF_xxx cr RF output ON OFF actual status not config MOD_xx...

Страница 196: ...12 volt power supply OK FLT PS3_xxx cr 12 volt power supply OK FLT MODE_xxxxxx cr Mode LOCAL or REMOTE SW_x xxx cr Software Version SFLT_xx cr lf Number of stored faults logged 0 to 10 5 6 Interface Transmit Side Status Command add ITXS_ cr Response add ITXS_ cr CLK_xxx cr Selected Transmit Clock Activity OK FLT DRP_xxx cr Drop OK FLT TXD_xxx cr Transmit Data OK FLT SFLT_xx cr lf Number of Stored ...

Страница 197: ...er not locked 5 8 3 Corrected BER Log Error data samples are compiled at the nominal system rate indicated by the time parameter t t The samples are stored in a thirty two element FIFO When the CBEL_ command is received the samples in the FIFO are formatted and returned as indicated The FIFO is then flushed If the FIFO becomes full the oldest sample will be lost as the current sample is written Co...

Страница 198: ..._nn ndB cr lf Example Request Eb N0 ratio from modem 2 Command 2 EBN0_ cr Response 2 EBN0_4 2dB cr lf Nb N0 4 2dB Note EB N0 limits are lower 3 2dB upper 9 7dB the upper limit is 16 0dB for the 949 decoder No Data is returned if no carrier is detected decoder not locked 5 10 Modulator Rate Status Command add MR_ cr Response add MR_nnn_mmmm m cr lf nnn 1 2 3 4 7 8 Coder rate mmmm m 56 0 to 4080 0 D...

Страница 199: ...of error rate data The IRE configuration command is used to select reading of frame or 2047 errors Command add IRES_ cr Response add IRES_xxxx_n nE e cr lf xxxx FRM FRAME or 2047 indicates type of error being read n n 1 0 to 9 9 error rate number e 2 to 6 exponent Example Command add IRES_ cr Response add IRES_FRM_2 3E 6 cr lf 5 15 Interface Buffer Fill Status Command add IBFS_ cr Response add IBF...

Страница 200: ...SDM 309B Satellite Modem Remote Control MN U SDM309B Rev B B 23 Fault number 0 9 0 is the first fault stored hh Hours in twenty four hour format mm Minutes ss Seconds MM Month DD Day YY Year ...

Страница 201: ... OK FLT QCH_xxx cr Q channel OK FLT BCLK_xxx cr bit clock OK FLT BERT_xxx cr lf BER threshold OK FLT 5 16 3 Common Equipment Stored Faults Command add CSF_ cr Response add CSF_ hh mm ss MM DD YY cr M C_xxx cr Monitor Control Module OK FLT INT_xxx cr Data Interface Module OK FLT BAT_xxx cr battery OK FLT PS1_xxx cr 5 volt power supply OK FLT PS2_xxx cr 12 volt power supply OK FLT PS3_xxx cr lf 12 v...

Страница 202: ...rogrammed p4 nnn_mmmm m where nnn is the code rate and mmmm m is the data rate in Kbps Parameter 5 p5 Modulator filter A assignment p5 nnn_mmmm m where nnn is the code rate and mmmm m is the data rate in Kbps Parameter 6 p6 Modulator filter B assignment p6 nnn_mmmm m where nnn is the code rate and mmmm m is the data rate in Kbps Parameter 7 p7 Modulator filter C assignment p7 nnn_mmmm m where nnn ...

Страница 203: ...meter 29 p29 Transmit Data Fault p29 n where n is 0 1 or 2 0 NONE 1 AIS 2 DATA Parameter 30 p30 Receive Data Fault p30 n where n is 0 1 or 2 0 NONE 1 AIS 2 DATA Parameter 31 p31 Interface buffer size p31 nn where nn is the currently programmed buffer size in milli seconds Parameter 32 p32 Interface read error select FRAME 2047 p32 n where n is 1 or 2 1 FRAME 2 2047 Parameter 33 p33 Descrambler ena...

Страница 204: ... 10 of the number of modulator stored faults Character b Modulator fault status character 2 Bit 6 1 always Bit 5 AGC fault Bit 4 Modulator RF synthesizer fault Bit 3 Bit clock fault Bit 2 Transmit clock fault Bit 1 I channel fault Bit 0 Q channel fault Character c Demodulator fault status character 1 Bit 6 1 always Bit 5 Demodulator fault Bit 4 Carrier detect status 0 for decoder lock Bit 3 throug...

Страница 205: ...er of interface transmit side stored faults Character h Interface transmit side faults character 2 Bit 6 1 always Bit 5 Transmit clock activity fault Bit 4 Drop fault Bit 3 Transmit DATA AIS fault Bit 2 not used Bit 1 not used Bit 0 not used Character i Interface receive side faults character 1 Bit 6 1 always Bit 5 MUX lock fault Bit 4 Insert clock activity fault Bit 3 through Bit 0 Binary represe...

Страница 206: ...xx_n nE e where xxxx_n nE e is the read error status as defined in this document Parameter 6 p6 Buffer Fill Status p6 nn where nn is the buffer fill status Note Parameters 1 through 6 are dependent on carrier acquisition if the decoder is not locked empty data blocks are returned 5 20 Change Status This command indicates that a change has or has not occurred on either the BCS_ or the BCSF_ respons...

Страница 207: ...Remote Control SDM 309B Satellite Modem B B 30 MN U SDM309B Rev Where x xx is the software version number ...

Страница 208: ...e M N or 1 1 switch The modem to channel unit interface options are RS422 449 Use cable AS 0741 as the interconnect cable V 35 Use cable AS 0479 as the interconnect cable The interconnect between the switch and the channel unit requires a special DTE to DCE adapter cable to connect the two DTE connectors The channel unit to switch interface options are DS1 G 703 Use cable AS 0752 as the interconne...

Страница 209: ...rnal Channel Unit SDM 309B Satellite Modem C C 2 MN U SDM309B Rev molex connector on the cable between the modem and the channel unit The following drawings Figure C 2 through C 8 are attached for reference ...

Страница 210: ...SDM 309B Satellite Modem External Channel Unit MN U SDM309B Rev C C 3 Figure C 1 Satellite Communications System With External Channel Unit ...

Страница 211: ...External Channel Unit SDM 309B Satellite Modem C C 4 MN U SDM309B Rev Figure C 2 System Interconnect Diagram ...

Страница 212: ...SDM 309B Satellite Modem External Channel Unit MN U SDM309B Rev C C 5 Figure C 3 Adapter Cable AS 0749 V 35 ...

Страница 213: ...External Channel Unit SDM 309B Satellite Modem C C 6 MN U SDM309B Rev Figure C 4 Adapter Cable AS 0750 V 35 ...

Страница 214: ...SDM 309B Satellite Modem External Channel Unit MN U SDM309B Rev C C 7 Figure C 5 Adapter Cable AS 0751 RS449 ...

Страница 215: ...External Channel Unit SDM 309B Satellite Modem C C 8 MN U SDM309B Rev Figure C 6 Adapter Cable AS 0752 15 Pin D ...

Страница 216: ...SDM 309B Satellite Modem External Channel Unit MN U SDM309B Rev C C 9 Figure C 7 Adapter Cable AS 0741 RS449 ...

Страница 217: ...External Channel Unit SDM 309B Satellite Modem C C 10 MN U SDM309B Rev Figure C 8 Adapter Cable AS 0753 15 Pin D ...

Страница 218: ...lock is accepted on the Terminal Timing TT input to clock in the data to be transmitted In either case the phase relationship between the clock and data is not important as long as it meets the jitter specifications of RS422 or MIL STD 188 100 because a clock phase correction circuit is provided which shifts the clock away from the data transition times The clock phasing is jumper selectable at JP...

Страница 219: ... and DEMODULATOR faults They are available on the FAULT connector on the modem rear panel Generation of these fault conditions is described in Section 3 1 5 Fault indicators are also provided on TTL open collector drivers on the RS422 or MIL STD 188 114 connector The TTL MOD fault indicates a MODULATOR fault or COMMON EQUIPMENT fault while the TTL DEMOD fault indicates a DEMOD or COMMON EQUIPMENT ...

Страница 220: ...SDM 309B Satellite Modem External Channel Unit MN U SDM309B Rev C C 13 Figure C 9 RS422 MIL STD 188 114 Interface ...

Страница 221: ...External Channel Unit SDM 309B Satellite Modem C C 14 MN U SDM309B Rev Figure C 10 RS422 MIL STD 188 114 Block Diagram ...

Страница 222: ...88 RS422 Hard loops CTS to RTS JP10 Loop Timing REM On Off JP11 Asyn Clk Syn 5 Cut Shorts JP12 SCT 1 to 2 Invert 2 to 3 Normal JP13 RD 1 to 2 Invert 2 to 3 Normal JP14 RR 1 to 2 Invert 2 to 3 Normal JP15 DM 1 to 2 Invert 2 to 3 Normal JP16 SD 1 to 2 Invert 2 to 3 Normal Indicates Factory jumper settings for MIL 188 RS422 interface type Table C 2 AS 0627 3 Rev C Board Jumper Selection JP1 Clock Sel...

Страница 223: ... RECEIVER READY RR A RR B 13 31 TERMINAL TIMING TT A TT B 17 35 MOD FAULT _ 3 DEMOD FAULT _ 21 MASTER CLOCK INPUT MC A MC B 16 34 2 1 3 Specification Circuit Supported SD ST TT RD RT DM RR MOD FAULT DEMOD FAULT MC Amplitude RD RT ST DM RR 4 2 V differential into 100 DC Offset RD RT ST DM RR 0 4 V Impedance RD RT ST DM RR Less than 100 differential Impedance SD TT MC 100 20 differential Polarity Tr...

Страница 224: ... data relationships exist The INVERT mode is used when the incoming clock is inverted from the standard clock and data relationship Data received by the modem is output on the Received Data RD lines while the recovered clock is output on the Serial Clock Receive SCR lines For applications that require the rising edge of the clock to occur in the middle of the data bit time Receive Clock NORMAL mod...

Страница 225: ... fault indicates a DEMOD or COMMON EQUIPMENT fault Table C 3 lists the jumper settings for the V 35 interface These jumpers are factory set for a specific configuration Clock selections signal selections and loop timing can be changed upon individual needs Table C 3 AS 0627 2 Rev E Board Jumper Selection JP1 TX Clock Select Normal Invert Auto JP2 Interface Select V 35 2 JP3 RX Data Normal Buffer J...

Страница 226: ...SDM 309B Satellite Modem External Channel Unit MN U SDM309B Rev C C 19 Figure C 11 V 35 Interface Card ...

Страница 227: ...External Channel Unit SDM 309B Satellite Modem C C 20 MN U SDM309B Rev Figure C 12 V 35 Interface Block Diagram ...

Страница 228: ...INPUT MC A MC B CC c DD d 2 2 3 Specification Circuit Supported SD SCT SCTE RD SCR DSR RLSD MOD FAULT DEMOD FAULT MC Amplitude RD SCR SCT SD SCTE 55 V pk 20 differential into 100 Amplitude CTS DSR RLSD 10 5 V into 5000 2000 Impedance RD SCR SCT 100 20 differential Impedance SD SCTE 100 10 differential Impedance RTS 5000 2000 2500 pf DC Offset RD SCR SCT 6 V max 1000 ohm termination to ground Polar...

Страница 229: ... on line two Use the arrow keys to select one of four predefined rates TX_Freq Programs the modulator transmit frequency between 50 90 MHz or 100 180 MHz in 2 5 KHz Steps On entry the current transmitter frequency is displayed with the flashing cursor on the first character Use the right and left arrow keys to move the flashing cursor and the up and down arrow keys to increment or decrement the di...

Страница 230: ...ck is displayed with the flashing cursor on the first character Use the arrow keys to select ON or OFF Press the Enter key to execute the change BBLoopBk Programs the modem for baseband loopback operation When baseband loopback is turned on the data and timing signals are hard wired relays from the demodulator to the modulator The DTE base band signals are also looped back from transmitter data an...

Страница 231: ...ecute the change CW_Mode Programs the modem for continuous wave mode Three modes of operation are available center dual and offset modes On entry the CENTER mode is displayed To activate this test mode press the ENTER key Use the arrow keys to select the DUAL or the OFFSET modes To return to the CONFIG menu press the CLEAR key Note When the CLEAR key is pressed the modem is configured to the state...

Страница 232: ...Q Channl Q channel activity fault AGC_level Automatic gain control level fault Module Modulator module fault Typically indicates that the modulator module is missing or will not program Dmd_Flts Demodulator Decoder Faults C_Detect Carrier detect fault Indicates that the decoder is not locked RF_Syn Demodulator RF synthesizer fault Data_Clk Receive data clock activity fault I Channl I channel activ...

Страница 233: ...he modulator and demodulator A lamp test is available to test the front panel indicators Note The selection of data code rates in the UTILITY program must match the hardware filters installed on the modulator and demodulator modules Time Set Real Clock Time The current time that the modem is set for is displayed when selected To set the modem time press the ENTER key and use the right and left arr...

Страница 234: ...wing TXA on line one will be the coder rate 1 2 3 4 or 7 8 and on line two will be the data rate assigned to filter A Use the right and left arrow keys to see the assignments for filters B C and D TXB TXC and TXD If it is desired to change a filter assignment press the ENTER key when the data for that filter is displayed Use the right and left arrow keys until the flashing cursor is at the paramet...

Страница 235: ...External Channel Unit SDM 309B Satellite Modem C C 28 MN U SDM309B Rev Figure C 13 Menu Tree ...

Страница 236: ...SDM 309B Satellite Modem External Channel Unit MN U SDM309B Rev C C 29 Figure C 14 Menu Tree ...

Страница 237: ...External Channel Unit SDM 309B Satellite Modem C C 30 MN U SDM309B Rev Figure C 15 Menu Tree ...

Страница 238: ...SDM 309B Satellite Modem External Channel Unit MN U SDM309B Rev C C 31 ...

Страница 239: ...roperly Note See Table D 1 for the definition of the various firmware that is available 4 Remove the battery jumper JP6 for about 20 seconds and reinstall in the ON position 5 Reinstall the monitor and control card into the modem chassis 6 Remove the Viterbi Decoder card 0701 0949 or 2133 from the modem chassis The Decoder card is the horizontal card with grey card ejectors 7 Remove the PROM in pr...

Страница 240: ...n three 3 EPROMs Two EPROM s U7 U8 contain the various modem program codes and the other U9 contains the data information for the various plug in modules The firmware for the Viterbi Decoder card is contained in one EPROM Refer to the decoder firmware table below for location M C U Firmware Number Description U7 FW 0713 11D SDM309 Variable Rate Standard Version 2 66 U7 U8 FW 0713 19X SDM309 M1200P...

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