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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)
(R>L)
Generic Signal Description
Pin #
13
Clear to Send B *
25
12
Internal Transmit Clock B
24
Transmit Clock A
11
Transmit Clock B
23
10
Receiver Ready B
22
Data Set Ready B (NOTE 2)
9
Receive Clock B
21
8
Receiver Ready A
20
7
Signal Ground
19
Request to Send B *
6
Data Set Ready A (NOTE 2)
18
5
Clear to Send A *
17
Receive Clock A
4
Request to Send A *
16
Receive Data B
3
Receive Data A
15
Internal Transmit Clock A
2
Transmit Data A
14
Transmit Data B
1
Shield
Notes:
When the rear-panel LED marked "1:N Active!" is OFF, all of the signals shown above are available
1)
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.
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 3-1. Data Interface Connector Pinouts
Direction
Modem to DTE
Modem to DTE
DTE to Modem
DTE to Modem
Modem to DTE
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
DTE to Modem
DTE to Modem
–
EIA-422
V.35
EIA 530
CS B
–
(NOTE 2)
ST B
SCT B
TT A
SCTE A
TT B
SCTE B
(NOTE 2)
RR B
–
DM B
–
RT B
SCR B
(NOTE 2)
RR A
RLSD
(NOTE 2)
SG
SG
RS B
-
DM A
DSR
(NOTE 2)
CS A
CTS
RT A
SCR A
RS A
RTS
RD B
RD B
RD A
RD A
ST A
SCT A
SD A
SD A
SD B
SD B
Shield
FG
3–6
MN-CDM625A
Revision 4
Circuit
HSSI
LVDS
#
–
–
106
ST B
ST B
114
TT A
TT A
113
TT B
TT B
113
CA B
RR B
109
–
–
–
RT B
RT B
115
CA A
RR A
109
SG
SG
102
TA B
–
105
–
–
–
–
–
106
RT A
RT A
115
TA A
–
105
RD B
RD B
104
RD A
RD A
104
ST A
ST A
114
SD A
SD A
103
SD B
SD B
103
Shield
Shield
101
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