Comtech EF Data CRS-300 - Manual (Page 62)

CRS-300 1:10 Redundancy Switch MN/CRS300.IOM
Switch Connectors and Pinouts Revision 19
3–8
3.2.2.2 EIA-232/422/V.35/LVDS Connector, DB-25F (CRS-320/340)
Table 3-5 indicates the pinout for the DB-25F EIA-232/422/V.35/LVDS User Data Interface
connector – “J1” on the CRS-320 TMI (obsolete), and “J2” on the CRS-340 TMI.
Table 3-5. EIA-232/422/V.35/LVDS Connector
Pin Generic Signal Function Direction Circuit No. EIA-232 EIA-422/530 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 DA TT A SCTE A
11 Transmit Clock ‘B’ DTE to Modem 113 --- TT B SCTE B
23
External Carrier Off
(EIA-232 ‘1' or TTL ‘low’)
DTE to Modem --- --- --- ---
10 Receiver Ready ‘B’ Modem to DTE 109 --- RR B
22 Note 2
9 Receive Clock ‘B’ Modem to DTE 115 --- RT B SCR B
21 Note 2
8 Receiver Ready ‘A’ Modem to DTE 109 CF RR A RLSD *
20 Note 2
7 Signal Ground --- 102 AB SG SG
19 Note 2
6 Note 2
18 Note 2
5 Note 2
17 Receive Clock ‘A’ Modem to DTE 115 DD RT A SCR A
4 Note 2
16 Receive Data ‘B’ Modem to DTE 104 --- RD B RD B
3 Receive Data ‘A’ Modem to DTE 104 BB RD A RD A
15 Internal Transmit Clock ‘A’ Modem to DTE 114 DB ST A SCT A
2 Transmit Data ‘A’ DTE to Modem 103 BA SD A SD A
14 Transmit Data ‘B’ DTE to Modem 103 --- SD B SD B
1 Shield --- 101 AA Shield 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.