Data Interface Connector (P3B); Table 5-4. Data Interface Connector Pin Assignments - Comtech EF Data CDM-600 Installation And Operation Manual

CDM-600 Satellite Modem
Connector Pinouts
5.4

Data Interface Connector (P3B)

The Data Interface connector, a 25-pin D type female, conducts data input and output
signals to and from the modem, and connects to customer's terrestrial equipment,
breakout panel, or protection switch. Refer to Table 5-4 for pin assignments.
Generic Signal
Pin #
description
2 Transmit Data A
14 Transmit Data B
24 Transmit Clock A
11 Transmit Clock B
15 Internal Transmit
Clock A
12 Internal Transmit
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
23 External Carrier Off
(EIA-232 '1' or TTL
'low' )
7 Signal Ground
1 Shield
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 Receive Clock if the Modem is DTE, and ignore
Transmit clocks if the Modem is DCE.
5. For IDR operation using G.703, this primary interface becomes the 8 kbps EIA-422 overhead channel.

Table 5-4. 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
DTE to Modem
-
-
EIA-422
EIA 530 V.35
LVDS
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 -
- -
SG SG
Shield FG
5–3
Revision 7
MN/CDM600.IOM
EIA-232 Circuit #
BA 103
- 103
DA 113
- 113
DB 114
- 114
BB 104
- 104
DD 115
- 115
CF 109
- 109
- -
AB 102
AN 101