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4. Indicator LEDs
Power (Green) – Indicates that the IDU is powered up correctly from an external power source.
Alarm (Yellow) – Indicates loss of IDU-ODU command/telemetry link. This alarm is also
accompanied by the closing of Relay 1 (accessible via the Overhead/Alarm Interface Section
below).
Fault (Red) – Indicates loss of lock in demodulator. This alarm is also accompanied by the closing
of Relay 2 (accessible via the Overhead/Alarm Interface Section below).
5. Command Line Serial Interface (CLI)
The CLI interface presents a standard three-wire RS-232 DCE interface on a female DB-9 connector. The
CLI interface on your terminator emulator program must be set to the values shown in Table 4-3. The
recommended emulator SW program is TeraTerm.
Description Value
Data Rate 57,600 bps
Data Bits 8
Parity No
Stop Bit 1
Hardware None
Table 4-1: Terminal emulator setting
6. Overhead/Alarm Interface
The signals associated with auxiliary serial channel, relays and alarms are provided over a DB-26 interface
with connector pinouts and signal assignments as defined in 403 and Table 4-2 below.
Figure 4-3: Pinout for High-density DB-26 Connector (as seen looking at front panel)