Terrestrial Data Connection Group; Data Interface (Db-25F); Table 3-2. Data Interface Connector Pinouts - Comtech EF Data CDM-625A Installation And Operation Manual

CDM-625A Advanced Satellite Modem
Rear Panel Connectors and Pinouts
3.2.2

Terrestrial Data Connection Group

3.2.2.1

Data Interface (DB-25F)

Pin #
Generic Signal Description
(R-L)
1 Shield
14 Transmit Data B
2 Transmit Data A
15 Internal Transmit Clock A
3 Receive Data A
16 Receive Data B
4 Request to Send A *
17 Receive Clock A
5 Clear to Send A *
18
6 Data Set Ready A (NOTE 2)
19 Request to Send B *
7 Signal Ground
20
8 Receiver Ready A
21
9 Receive Clock B
22 Data Set Ready B (NOTE 2)
10 Receiver Ready B
23
11 Transmit Clock B
24 Transmit Clock A
12 Internal Transmit Clock B
25
13 Clear to Send B *
Notes:
1. When t he r ear-panel LE D m arked " 1:N A ctive!" i s OFF, al l of t he s ignals s hown abov e ar e av ailable and f unctional. I n
addition, pi ns not s hown are not connected, and therefore no damage will oc cur i f ot her signals ar e c onnected to the
additional pins.
The Data Interface connector is a 25-pin, Type 'D' female interface that
conducts data input and output signals to and from the modem, and
connects to customer's terrestrial equipment, breakout panel, or
protection switch.

Table 3-2. Data Interface Connector Pinouts

Direction
–
DTE to Modem
DTE to Modem
Modem to DTE
Modem to DTE
Modem to DTE
DTE to Modem
Modem to DTE
Modem to DTE
Modem to DTE
DTE to Modem
–
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
Shield FG
SD B SD B
SD A SD A
ST A SCT A
RD A RD A
RD B RD B
RS A RTS
RT A SCR A
CS A CTS
(NOTE 2)
DM A DSR
RS B -
SG SG
(NOTE 2)
RR A RLSD
(NOTE 2)
RT B SCR B
DM B –
RR B –
(NOTE 2)
TT B SCTE B
TT A SCTE A
ST B SCT B
(NOTE 2)
CS B –
3–4
Revision 0
MN-CDM625A
Circuit
HSSI LVDS
#
Shield Shield 101
SD B SD B 103
SD A SD A 103
ST A ST A 114
RD A RD A 104
RD B RD B 104
TA A – 105
RT A RT A 115
– – 106
– – –
TA B – 105
SG SG 102
CA A RR A 109
RT B RT B 115
– – –
CA B RR B 109
TT B TT B 113
TT A TT A 113
ST B ST B 114
– – 106