Comtech EF Data SDR-54A - Manual (Page 39)

SDR-54A Satellite Demodulator Revision 4
DEMUX Option MN/SDR54A.IOM
5.2.3 DEMUX 2/4-Channel Specification
Table 5-1. Summary of DEMUX Specification
Parameter Specification
DEMUX Type Synchronous, symmetrical data rates on all tributaries
Tributary Channels 2 or 4, automatic detection
Tributary Data Interface RS-422 or RS-232, 25-pin D-sub
Tributary Data Rate:
4-Channel Mode
2-Channel Mode
Clock
9.6 to 64.0 kbit/s, 32/129 of aggregate channel
9.6 to 128.0 kbit/s, 64/129 of aggregate channel
50% duty cycle,
± 10%, phase locked to aggregate channel
Synchronization Indicator TTL, on interface connector (1 = SYNC)
Mode Indicator TTL, on interface connector (0 = 2 channel mode)
5.2.4 Tributary Data Interface Connector RS-422 (J4)
Table 5-2. Tributary Data Interface Connector (RS-422)
Rear Panel 25-Pin D Connector
J4 DEMUX T1-4
Pin # Circuit Description
1 RXDaT1 Trib #1 data inverting output
14 RXDbT1 Trib #1 data non-inverting output
2 RXCaT1 Trib #1 clock inverting output
15 RXCbT1 Trib #1 clock non-inverting output
6 RXDaT2 Trib #2 data inverting output
19 RXDbT2 Trib #2 data non-inverting output
21 RXCaT2 Trib #2 clock inverting output
9 RXCbT2 Trib #2 clock non-inverting output
22 RXDaT3 Trib #3 data inverting output
10 RXDbT3 Trib #3 data non-inverting output
23 RXCaT3 Trib #3 clock inverting output
11 RXCbT3 Trib #3 clock non-inverting output
24 RXDaT4 Trib #4 data inverting output
12 RXDbT4 Trib #4 data non-inverting output
15 RXCaT4 Trib #4 clock inverting output
13 RXCbT4 Trib #4 clock non-inverting output
16 DMXSYNC DEMUX synchronization indicator (TTL, 1 = SYNC)
5 DMXMD DEMUX mode indicator (TTL, 0 = 2 channel mode)
7 GND Ground
8 CDa Carrier detect inverting
20 CDb Carrier detect non-inverting
3 RXDa Aggregate channel data inverting output (RS-422)
4 RXDb Aggregate channel data non-inverting output (RS-422)
17 RXCa Aggregate channel clock inverting output (RS-422)
18 RXCb Aggregate channel clock non-inverting output (RS-422)
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