Comtech EF Data CRS-150 - Manual (Page 31)

CRS-150 1:1 Redundancy Switch Revision 2
Connector Pinouts MN/CRS150.IOM
3–5
3.2.2.2 Data Interface Connector, DB-25F
The 25-pin ‘D’ Type female (DB-25F) Data Interface connector
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 Connector (DB-25F)
Pin # Generic Signal Description Direction
EIA-422
EIA-530
LVDS
V.35 EIA-232 Circuit #
2 TX Data A DTE to Modem SD A SD A BA 103
14 TX Data B DTE to Modem SD B SD B -- 103
24 TX Clock A DTE to Modem TT A SCTE A DA 113
11 TX Clock B DTE to Modem TT B SCTE B -- 113
15 INT TX Clock A Modem to DTE ST A SCT A DB 114
12 INT TX Clock B Modem to DTE ST B SCT B -- 114
3 RX Data A Modem to DTE RD A RD A BB 104
16 RX Data B Modem to DTE RD B RD B -- 104
17 RX Clock A Modem to DTE RT A SCR A DD 115
9 RX Clock B Modem to DTE RT B SCR B -- 115
8 Receiver Ready A Modem to DTE RR A RLSD * CF 109
10 Receiver Ready B Modem to DTE RR B -- -- 109
23
External Carrier Off
(EIA-232 ‘1' or TTL ‘low’ )
DTE to Modem -- -- -- --
7 Signal Ground -- SG SG AB 102
1 Shield -- Shield FG AN 101
Notes:
1. Receiver Ready is an EIA-232 -level control signal on a V.35 interface.
2. DO NOT connect signals to pins which are not shown - these pins 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 RX Clock if the Modem is DTE,
and ignore TX clocks if the Modem is DCE.
5.
For IDR operation using G.703, this primary interface becomes the 8 kbps EIA-422
overhead channel.