East Coast Datacom Nx8- Dual Composite MUX High-Speed 16-Port TDM Multiplexer, Operation Manual

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5.2.2 Composite Port Connector (DTE)
25 24 23 22 21 20 19 18 17 16 15 14
13 12 11 10 9 8 7 6 5 4 3 2 1
25-pin Sub-Miniature D-type Connector with Pins (male)
Signal
Pin No. RS-232 Mode EIA-530 Mode V.35 Mode *
1 Frame GND Frame GND (Shield) Frame GND (Shield)
2 TxD TxD + SD +
3 RxD RxD + RD +
4 RTS RTS + RTS
5 CTS CTS+ CTS
6 DSR DSR+ DSR
7 Signal GND Signal GND Signal GND
8 DCD DCD+ RLSD
9 RxC - SCR -
10 DCD -
11 TxCE - SCTE -
12 TxC - SCT -
13 CTS -
14 TxD - SD -
15 TxC (Sync Only) TxC + SCT +
16 RxD - RD -
17 RxC (Sync Only) RxC + SCR +
19 RTS -
20 DTR DTR+ DTR
22 DSR -
23 DTR-
24 TxCE (Sync Only) TxCE + SCTE +
Note: undesignated pin No.‟s are Unconnected
Table 16 - Composite Port Connector Pinouts