Chapter 5. Connector Pinouts; Data Interface Connector; Table 5-2. Data Interface Connector Pin Assignments - Comtech EF Data CDM-570L Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Connector Pinouts
5.2

Data Interface Connector

The Data Interface connector, a 25-pin D type female, conducts data input and output
breakout panel, or protection switch. Refer to Table 5-2 for pin assignments.
IMPORTANT
Generic Signal
Pin #
Description
2 Transmit Data A
14 Transmit Data B
24 Transmit Clock A
11 Transmit Clock B
15 Internal Tx Clock A
12 Internal Tx Clock B
3 Receive Data A
16 Receive Data B
17 Receive Clock A
9 Receive Clock B
8 Receiver Ready A
10 Receiver Ready B
5 Clear to Send A *
13 Clear to Send B *
4 Request to Send A *
19 Request to Send B *
6 Data Set Ready A *
22 Data Set Ready B *
7 Signal Ground
1 Shield
Notes:
•
When the rear-panel switch marked "1:N Switch" is in the OFF position, all of the signals shown
above are available and functional. In addition, pins not shown are not connected, and therefore no
damage will occur if other signals are connected to the additional pins.
•
When the rear-panel switch marked "1:N Switch" is in the ON position, the highlighted signals, plus
pins 18, 20, 21, 22, 23 and 25 are reserved for use by the 1:N system. DO NOT connect signals to
any of these pins in this mode. Certain pins have DC voltages present that may damage equipment
other than a Comtech EF Data redundancy switch.
•
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.
THE MODEM IS ALWAYS ASSUMED TO BE DCE.

Table 5-2. Data Interface Connector Pin Assignments

Direction
DTE to Modem
DTE to Modem
DTE to Modem
DTE to Modem
Modem to DTE
Modem to DTE
Modem to DTE
Modem to DTE
Modem to DTE
Modem to DTE
Modem to DTE
Modem to DTE
Modem to DTE
Modem to DTE
DTE to Modem
DTE to Modem
Modem to DTE
Modem to DTE
-
-
EIA-422
V.35
EIA-530
SD A SD A
SD B SD B
TT A SCTE A
TT B SCTE B
ST A SCT A
ST B SCT B
RD A RD A
RD B RD B
RT A SCR A
RT B SCR B
RR A RLSD
RR B
CS A CTS
CS B
RS A RTS
RS B
TR A DSR
TR B
SG SG
Shield FG
5–2
Revision 4
MN/CDM570L.IOM
IMPORTANT
EIA-232 Circuit #
BA
-
DA
-
DB
-
BB
-
DD
-
CF
- -
CB
- -
CA
- -
CC
- -
AB
AN
103
103
113
113
114
114
104
104
115
115
109
109
106
106
105
105
107
107
102
101