Comtech EF Data CRS-300 - Manual (Page 61)

CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Switch Connectors and Pinouts Revision 19
3–7
3.2.2 TMI User Data Connectors
3.2.2.1 EIA-232/422/V.35 Connector, DB-25F (CRS-316)
See Table 3-4 for the pinouts of the DB-25F EIA-232/422/V.35 User Data Interface connector – “J2”
on the CRS-316 TMI.
Table 3-4. EIA-232/422/V.35 Connector
Pin Generic Signal Function Direction Circuit No. EIA-422/530 EIA-232 V.35
13 Note 2
25 Note 2
12 Internal Transmit Clock ‘B’ Modem to DTE 114 ST B --- SCT B
24 Transmit Clock ‘A’ DTE to Modem 113 TT A DA SCTE A
11 Transmit Clock ‘B’ DTE to Modem 113 TT B --- SCTE B
23 Note 2
10 Receiver Ready ‘B’ Modem to DTE 109 RR --- B
22 DCE Ready ‘B’ Modem to DTE DM_B DM_B
9 Receive Clock ‘B’ Modem to DTE 115 RT B - SCR B
21 Note 2
8 Receiver Ready ‘A’ Modem to DTE 109 RR A CF RLSD Note 1
20 Note 2
7 Signal Ground --- 102 SG AB SG
19
Request to Send ‘B’ /
Ready for Receiving ‘B’
DTE to Modem
RS B RS B
6 DCE Ready ‘A’ Modem to DTE DM_A DM_A
18 Note 2
5 Note 2
17 Receive Clock ‘A’ Modem to DTE 115 RT A DD SCR A
4 Request to Send ‘A’ /
Ready for Receiving ‘A’
DTE to Modem
RS A RS A
16 Receive Data ‘B’ Modem to DTE 104 RD B --- RD B
3 Receive Data ‘A’ Modem to DTE 104 RD A BB RD A
15 Internal Transmit Clock ‘A’ Modem to DTE 114 ST A --- SCT A
2 Transmit Data ‘A’ DTE to Modem 103 SD A BA SD A
14 Transmit Data ‘B’ DTE to Modem 103 SD B --- SD B
1 Shield --- 101 Shield AA FG
Notes:
1) “Receiver Ready” is an EIA-232-level control signal on a V.35 interface.
2) Do NOT connect signals to these pins – they are reserved for use by the redundancy system.
3) 'B' signal lines are not used for EIA-232 applications.
4) For X.21 operation, use the EIA-422 pins, but ignore Receive Clock if the modem is DTE, and ignore Transmit clocks if the modem is DCE.