Comtech EF Data DMD2401/DMD2401L - Manual (Page 149)

Electrical Interfaces DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
5-10 TM065 – Rev. 3.3
5.5.6 ALARM (J6)
The modem has two Form-C Dry Contact Alarm Relays onboard and an Alarm Connector located
on the rear panel, the 9-pin male “D” sub connector (J6).
The two relays are designated Modulator Alarm and Demodulator Alarm. Non-Alarm is defined as
the powered state of the relay. Thus, if there is a Modulator Alarm and/or Demodulator Alarm, the
pins will be connected as shown in Table 5-3:
The pin definitions for J6 are shown in Table 5-4.
Note: The NC and NO (Normally Closed and Normally Open) nomenclature applies to non-
energized relays.
5.5.7 REMOTE (J7)
The Remote Port (J7) is the RS-485 connection for remote monitor and control of the modem. It
is a 9-Pin Female “D” Connector. Refer to Table 5-5 for the connector pinouts.
5.5.8 SWITCH INTERFACE (J8)
The Switch Interface Port (J8) is the redundancy switch connector. It is a 68-Pin High-Density
Female Connector. Refer to Table 5-10 for connector pinouts.
Table 5-10. Switch Interface Port - 68-Pin High-Density Female – (J8)
Pin Number Signal Description Direction
1 G.703B SD-A G.703 Send Data Input A Input
2 SYNC SD-A Synchronous Data Send Data Input -A Input
3 ESCBWO 1C IDR ESC Backward Alarm Out - 1 Common Output
4 G.703B IDI-A G.703 Insert Data Input - A Input
5 SYNC ST-A Synchronous Data Send Timing Output - A Output
6 ESCBWO 1NO IDR ESC Backward Alarm Out - 1 Normally
Open Output
7 SYNC TT-A Synchronous Data Terminal Timing Input A Input
8 ESCBWO 2NC IDR ESC Backward Alarm Out - 2 Normally
Closed Output
9 DDO-A RT-A G.703 Drop Data Out A - Synchronous
Data Receive Timing Output - A Output
10 ESCBWO 3C IDR ESC Backward Alarm Output - 3
Common Output
11 IDO-A RD-A G.703 Insert Data Out A - Synchronous
Data Receive Data A Output
12 ESCBWO 3NO IDR ESC Backward Alarm Output - 3
Normally Open Output
13 BAL EXC-A External Clock Input - A Input
14 GND Ground –
15 ESCAUDTX 1A IDR ESC Audio Input Channel 1A Input