Comtech EF Data SMS-451 - Manual (Page 37)

SMS-451 Satellite Switch Revision 0
Installation MN/SMS451.IOM
2-11
2.3.2.1 ECL Baseband DATA I/O (B, Common, and A)
The ECL interface is provided on a 50-pin female D connector. The switch DATA I/O
connectors provide the baseband data interface from the DTE equipment to the switch,
and from the switch to the prime and backup modems. Screw locks are provided for
mechanical security of the mating connector.
Signal Function Name Pin #
GROUND GND 1, 2
SEND DATA (SD) TXD-A (ECL-)
TXD-B (ECL+) 37
38
TERRESTRIAL TIMING (TT) TXO-A (ECL-)
TXO-B (ECL+) 4
5
SYNC TX FRAME (TX SYNC) SD-A (ECL-)
SD-B (ECL+) 34
18
EXTERNAL BUFFER CLOCK EXC-A (ECL-)
EXC-B (ECL+)
35
19
RECEIVE DATA (RD) RXD-A (ECL-)
RXD-B (ECL+) 39
40
RECEIVE TIMING (RT) RXC-A
RXC-B 23
24
SYNC RX FRAME (RX SYNC) RD-A
RD-B 36
20
SEND TIMING (ST) RXC-A
RXC-B 21
22
RECEIVE LINE SIGNAL DET RXO-A
RXO-B 6
7
ADPCM1 AUDIO IN A1I-A
A1I-B 45
29
ADPCM1 AUDIO OUT A1O-A
A1O-B 46
30
ADPCM2 AUDIO IN A2I-A
A2I-B 47
31
ADPCM2 AUDIO OUT A2O-A
A2O-B 48
32
BACKWARD ALARM 1 OUT BWO1-C
BWO1-NC
BWO1-NO 8 (See Note 1)
25
41
BACKWARD ALARM 2 OUT BWO2-C
BWO2-NC
BWO2-NO 9 (See Note 1)
26
42
BACKWARD ALARM 3 OUT BWO3-C
BWO3-NC
BWO3-NO 10 (See Note 1)
27
43
BACKWARD ALARM 4 OUT BWO4-C
BWO4-NC
BWO4-NO 11 (See Note 1)
28
44