Comtech EF Data SDM-300L - Manual (Page 30)

SDM-300L Satellite Modem Installation
Rev. 2 2–9
Table 2-4. 25-Pin D Connector Pinouts
25-Pin D Connector
Pin # EIA-422 EIA-232 V.35
1 SHLD SHLD SHLD
2 SD-A TXD SD-A
3 RD-A RXD RD-A
4 RS-A RTS RTS
5 CS-A CTS CTS
6 DM-A DSR DSR
7 SIGGND SIGGND SIGGND
8 RR-A
DCD RLSD
9 RT+B SCR+B
10 RR-B
11 TT+B SCTE+B
12 ST+B SCT+B
13 CS+B
14 SD+B SD+B
15 ST-A ST SCT-A
16 RD+B RD+B
17 RT-A RXC SCR-A
18 LL LL LL
19 RS+B
20* MC-A MC MC-A
21 DF DF DF
22 DM+B
23* MC+B MC-B
24 TT-A TXC SCTE-A
25 MF MF MF
*Note: Use the MASTER clock for EXTERNAL clock input. This clock input
should equal the data rate unless the Asymmetrical Loop Timing Option (ASLT)
is available. The ASLT option allows selection of different clock rates that vary
from the digital data rate. Refer to the Utility/Modem Type/Modem Options menu
for the ASLT option information.