Mocomtech CDM-570L Manual De Usuario
CDM-570/570L Satellite Modem with Optional IP Module
Revision 4
Connector Pinouts
MN/CDM570L.IOM
5.2
Data Interface Connector
The Data Interface connector, a 25-pin D type female, conducts data input and output
breakout panel, or protection switch. Refer to Table 5-2 for pin assignments.
breakout panel, or protection switch. Refer to Table 5-2 for pin assignments.
IMPORTANT
THE MODEM IS ALWAYS ASSUMED TO BE DCE.
IMPORTANT
Table 5-2. Data Interface Connector Pin Assignments
Pin #
Generic Signal
Description
Direction
EIA-422
EIA-530
EIA-530
V.35
EIA-232
Circuit #
2
Transmit Data A
DTE to Modem
SD A
SD A
BA
103
14
Transmit Data B
DTE to Modem
SD B
SD B
-
103
24
Transmit Clock A
DTE to Modem
TT A
SCTE A
DA
113
11
Transmit Clock B
DTE to Modem
TT B
SCTE B
-
113
15
Internal Tx Clock A
Modem to DTE
ST A
SCT A
DB
114
12
Internal Tx Clock B
Modem to DTE
ST B
SCT B
-
114
3
Receive Data A
Modem to DTE
RD A
RD A
BB
104
16
Receive Data B
Modem to DTE
RD B
RD B
-
104
17
Receive Clock A
Modem to DTE
RT A
SCR A
DD
115
9
Receive Clock B
Modem to DTE
RT B
SCR B
-
115
8
Receiver Ready A
Modem to DTE
RR A
RLSD
CF
109
10
Receiver Ready B
Modem to DTE
RR B
-
-
109
5
Clear to Send A *
Modem to DTE
CS A
CTS
CB
106
13
Clear to Send B *
Modem to DTE
CS B
-
-
106
4
Request to Send A *
DTE to Modem
RS A
RTS
CA
105
19
Request to Send B *
DTE to Modem
RS B
-
-
105
6
Data Set Ready A *
Modem to DTE
TR A
DSR
CC
107
22
Data Set Ready B *
Modem to DTE
TR B
-
-
107
7
Signal Ground
-
SG
SG
AB
102
1 Shield
-
Shield
FG
AN
101
Notes:
• When the rear-panel switch marked “1:N Switch” is in the OFF position, all of the signals shown
above are available 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.
damage will occur if other signals are connected to the additional pins.
• When the rear-panel switch marked “1:N Switch” is in the ON position, the highlighted signals, plus
pins 18, 20, 21, 22, 23 and 25 are reserved for use by the 1:N system. DO NOT connect signals to
any of these pins in this mode. Certain pins have DC voltages present that may damage equipment
other than a Comtech EF Data redundancy switch.
any of these pins in this mode. Certain pins have DC voltages present that may damage equipment
other than a Comtech EF Data redundancy switch.
• 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.
5–2