Comtech EF Data CDM-425 Installation And Operation Manual page 79

(R>L)
Generic Signal Description
Pin #
22 Data Set Ready B (NOTE 2)
9 Receive Clock B
(NOTE 2)
21
8 Receiver Ready A
20 (NOTE 2)
7 Signal Ground
19 Request to Send B *
Data Set Ready A (NOTE 2)
6
(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
Shield
1
Notes:
When the rear-panel Light Emitting Diode (LED) marked "1:N Active!" is OFF, all of the signals shown above are
1.
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.
When the rear-panel LED marked "1:N Active!" is ON, the signals shown highlighted are no longer available.
2.
Furthermore, pins 6, 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 Direct Current (DC) voltages present that may damage
equipment other than a Comtech EF Data redundancy switch.
3. For X.21 operation, use the EIA-422 pins, but ignore Receive Clock if the Modem is Data Terminal Equipment
(DTE), and ignore Transmit clocks if the Modem is Data Circtui-termination Equipment (DCE).
4. For Intermediate Data Rate (IDR) operation using G.703, this primary interface becomes the 8 kbps EIA-422
overhead channel.
Rear Panel Connectors and Pinouts
EIA-422
Direction
EIA 530
Modem to DTE DM B
Modem to DTE RT B
Modem to DTE RR A
– SG
DTE to Modem RS B
Modem to DTE DM A
Modem to DTE CS A
Modem to DTE RT A
DTE to Modem RS A
Modem to DTE RD B
Modem to DTE RD A
Modem to DTE ST A
DTE to Modem SD A
DTE to Modem SD B
– Shield
3–7
CDM-425 Advanced Satellite Modem
V.35 HSSI LVDS
– – –
SCR B RT B RT B
RLSD CA A RR A
SG SG SG
- TA B –
DSR – –
CTS – –
SCR A RT A RT A
RTS TA A –
RD B RD B RD B
RD A RD A RD A
SCT A ST A ST A
SD A SD A SD A
SD B SD B SD B
FG Shield Shield
Revision 0
Circuit
#
–
115
109
102
105
–
106
115
105
104
104
114
103
103
101
MN-CDM-425