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CDM-600L Satellite Modem
Connector Pinouts
5.3
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 5-3 for pin assignments.
Generic Signal
Pin #
Description
2
TX Data A
14
TX Data B
24
TX Clock A
11
TX Clock B
15
INT TX Clock A
12
INT TX Clock B
3
RX Data A
16
RX Data B
17
RX Clock A
9
RX Clock B
8
Receiver Ready A
10
Receiver Ready B
23
External Carrier Off
(RS-232 '1' or TTL
'low' )
7
Signal Ground
1
Shield
Notes:
1.
Receiver Ready is an RS-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 RS-232 applications
4.
For X.21 operation, use the RS-422 pins, but ignore RX Clock if the Modem is DTE, and ignore TX clocks
if the Modem is DCE
5.
For IDR operation using G.703, this primary interface becomes the 8 kbps RS-422 overhead channel.
Table 5-3. 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
-
-
RS-422
RS- 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
5–4
Revision 2
MN/CDM600L.IOM
RS-232
Circuit #
BA
103
-
103
DA
113
-
113
DB
114
-
114
BB
104
-
104
DD
115
-
115
CF
109
-
109
-
-
AB
102
AN
101
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