User manual

DTS Broadcast PDH Microwave Digital Radio User Manual
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9.5 Alarm Relays
The alarm relays are presented on the front panel of the IDU. “Form C” relay outputs are
presented on the L54 IDU front panel ALARM RELAYS DB25 connector.
• Each relay output is mapped to provide an alarm summary of discrete alarm conditions within
the L54 terminal.
• The relays are intended for use with a customer’s existing external alarm collection and
monitoring system (e.g. SCADA) when the NMI feature is not used.
The pinout of the ALARM RELAYS connector is as detailed table 4-4
The default alarm relays configuration is as detailed table 10-6.
9.6 Loopbacks
For additional troubleshooting, local &remote loopback paths can be configured.
9.6.1 Local Loopback
Local Port Loopback:
This loopback is used for locating faults in equipment and cable connections to the local L54
by routing each tributary input (data from customer) directly to the corresponding tributary output (data
to customer). Any combination of tributaries may be configured for loopback. Figure 9-1 shows the
loopback path. The incoming data stream from the remote terminal for the tributaries configured in
loopback will be affected.
Figure 9-1 Local Port Loopback