Comtech EF Data SNM-1001L - Manual (Page 266)

SNM-1001L Satellite Modem Revision 1
Specifications MN/SNM1001L.IOM
A–28
A.12 Terrestrial Interface Types
The following interface types are available with electrical properties indicated in the
following subsections:
Modem Configuration EIA-422/
EIA-449
V.35
25-pin Connector X X
34-pin Connector X
37-pin Connector X
50-pin Connector X X
50-pin Connector
(Optional) X X
A.12.1 EIA-232 Specification
Circuit Supported TXD, TXC, ST, RXD, RXC, DSR, DCD, CTS, LL, RTS, MC
Driver Amplitude (RXD, RXC,
ST, CTS, DM, DSR) 0 / Space / ON (True): 10V, ± 5V
1 / Mark / OFF (False): -10V, ± 5V
Receiver Amplitude (TXD,
TXC, RTS, LL, MC) 0 / Space / ON (True): Minimum +1V
1 / Mark / OFF (False): Maximum -1V
Impedance 5000, ± 2000Ω < 2500 pF
Data Rate 9.6 to 120 kbps
TXD Send Data
RXD Receive Data
RTS Request to Send
CTS Clear to Send
DM Data Mode
DSR Receiver Ready
MC Master Clock
LL Local Loopback
ST Send Timing
RXC Receive Timing
TXC Terminal Timing
MF Mod Fault (TTL)
DF Demod Fault (TTL)