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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)
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
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