Comtech EF Data SNM-1010L - Manual (Page 46)

SNM-1010L Data/Control Modem Revision 0
Installation MN/SNM1010L.OM
2.3.5 User Port
The User Port provides for serial communications with the modem to allow user requests
for traffic channel assignments. The user has access to any traffic modem at the site. The
interface is provided on a 9-pin mini-DIN female connector (DCE) located on the rear
panel of the modem. Refer to the following listing for User Port specifications.
Connector Type 9-pin mini-DIN
Signal Type EIA-232
Rate 19.2 kbit/s, 8 bits-no parity-1stop
Note: Refer to Chapter 4, for additional information on the user port operation.
Pinout and signal levels are described in Table 2-11.
Table 2-11. User Port Pinout and Signals
Signal Function Name Pin # I/O Signal Level
Receiver Ready RR 1 O EIA-232
Receive Data RD 2 O EIA-232
Send Data SD 3 I EIA-232
Terminal Ready TR 4 I EIA-232
Signal Ground SG 5
Data Mode DM 6 O EIA-232
Request to Send RS 7 I EIA-232
Clear to Send CS 8 O EIA-232
Incoming Call IC 9 O EIA-232
2.3.6 TX IF Output Connector (CP1)
CP1 is a Type N connector for the TX-IF signal. The output impedance is 50 Ω.
2.3.7 RX IF Input (CP2)
CP2 is a Type F connector for the RX-IF signal. The input impedance is 75 Ω
(Optional: 50Ω).
2.3.8 External Reference (CP3)
CP3 is a BNC connector for an EX REF. The input impedance is 75 Ω. For normal
operation, the reference signal is ≥ 0 dBm.
EX REF frequencies are EXT1, EXT5, EXT10, and EXT20 MHz.
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