Comtech EF Data CRS-150 - Manual (Page 39)

CRS-150 1:1 Redundancy Switch Revision 2
Connector Pinouts MN/CRS150.IOM
3–13
3.3.2.4 Data Interface A and B Connectors, DB-25F
The 25-pin ‘D’ Type female (DB-25F) Data Interface A and B connectors
conduct data input and output signals to and from the modem, and
connects to customer’s terrestrial equipment.. It conforms to the EIA-530
pinout, which allows for connection of different electrical standards,
including EIA-422, V.35, and EIA-232. A shielded 25-pin ‘D’ type
connection provides a very solid solution to EMC problems, unlike the
sometimes-used V.35 Winchester connector.
It is the user’s responsibility to provide the appropriate cables to connect to this EIA-530
connector.
Data Interface A and B Connectors (DB-25F)
Pin # Signal Description Direction
EIA-422
EIA-530
LVDS
V.35 EIA-232 Circuit #
2 Transmit Data A Switch to Modem SD A SD A BA 103
14 Transmit Data B Switch to Modem SD B SD B - 103
24 Transmit Clock A Switch to Modem TT A SCTE A DA 113
11 Transmit Clock B Switch to Modem TT B SCTE B - 113
15 Internal Transmit Clock A Modem to Switch ST A SCT A DB 114
12 Internal Transmit Clock B Modem to Switch ST B SCT B - 114
3 Receive Data A Modem to Switch RD A RD A BB 104
16 Receive Data B Modem to Switch RD B RD B - 104
17 Receive Clock A Modem to Switch RT A SCR A DD 115
9 Receive Clock B Modem to Switch RT B SCR B - 115
8 Receiver Ready A Modem to Switch RR A RLSD * CF 109
10 Receiver Ready B Modem to Switch RR B - - 109
23
External Carrier Off
(EIA-232 ‘1’ or TTL ‘low’ )
Switch to Modem - - - -
18 Fused +12 volts Modem to Switch - - - -
25 Fused -12 volts Modem to Switch - - - -
21 Bal/Unbal interface Modem to Switch - - - -
20 1:1 Switch present Switch to Modem - - - -
6 Unit fault Modem to Switch - - - -
13 Tx Traffic fault Modem to Switch - - - -
5 Rx Traffic fault Modem to Switch - - - -
7 Signal Ground - SG SG AB 102
1 Shield - Shield FG AN 101