Comtech EF Data SNM-1010L - Manual (Page 43)

SNM-1010L Data/Control Modem Revision 0
Installation MN/SNM1010L.OM
Table 2-6. EIA-449 37-Pin Connector Pinouts (Continued)
Signal Function Name EIA-449
Pin #
V.35
Pin #
EIA-530
Pin #
I/O
Master Clock + (Input) MC-B 34 DD 23 I
Demod Fault DF 21 NN 21 O
Mod Fault MF 3 MM 25 O
Local Loopback LL 10 18 I
Signal Ground SG 1, 19,
20, 37
AB 1,7 –
Notes:
1. There are jumpers on the EIA-449 terrestrial interface assembly. Place the
jumpers on the center pin and the pin towards the Master Clock (MC), to allow
an external clock on pins 16 and 34.
2. If desired, place the jumpers on the TR side to allow an external clock input on
pins 12 and 30. Place the jumpers on the TR side for DAMA applications.
2.3.4.3 V.35 Specifications
Table 2-7. V.35 Specifications
Parameter Specification
Circuit Supported SD, SCT, SCTE, RD, SCR, DSR, RLSD, RTS, CTS, MC
Amplitude (RD, SCR, SCT, SD, SCTE) ± 55V-pk ± 20% differential, into 100 Ω
Amplitude (CTS, DSR, RLSD) ±10 ± 5V into ± 5000 ± 2000 Ω
Impedance (RD, SCR, SCT) 100, ± 255 > 20 Ω, differential
Impedance (SD, SCTE) 100, ± 10 Ω, differential
Impedance (RTS) 5000, ± 2000 Ω, < 2500 pF
DC Offset (RD, SCR, SCT) ± 0.6V maximum, 1000 Ω termination to ground
Polarity (SD, SCT, SCTE, RD, SCR) True when B positive with respect to A
False when A positive with respect to B
Polarity (RTS, CTS, DSR, RLSD) True when < -3V with respect to ground
False when > +3V with respect to ground
Phasing (SCTE, SCR) False-to-True transition nominally in center of data bit
Symmetry (SCT, SCTE, SCR) 50%, ± 5%
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