Comtech EF Data CDM-600/600L - Manual (Page 65)

CDM-600/600L Open Network Satellite Modem Revision 3
Rear Panel Connector Pinouts MN/CDM600L.IOM
3–5
3.3.2 P3B Data Interface Connector, DB-25F
The 25-pin ‘D’ Type female (DB-25F) P3B Data Interface connector
conducts data input and output signals to and from the modem, and connects
to customer’s terrestrial equipment, breakout panel, or protection switch. It
conforms to the RS-530 pinout, which allows for connection of different
electrical standards, including RS-422, V.35, and RS-232. A shielded 25-pin ‘D’ type connection
provides a very solid solution to EMC problems, unlike the sometimes-used V.35 Winchester
connector.
IMPORTANT
It is the User’s responsibility to provide the appropriate cables to connect to
this RS-530 connector.
P3B Data Interface Connector (DB-25F)
Pin #
Generic Signal
Description
Direction
RS-422
RS-530
LVDS
V.35 RS-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
(RS-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 RS-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 RS-232 applications
4. For X.21 operation, use the RS-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 RS-422 overhead
channel.