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Trib (#) LOS
Loss of signal on a commissioned tributary. This is a critical alarm.
Probable Cause
The failure may be within the attached equipment, the trib cable, or the radio.
Recommended Actions
1. Check for alarms on trib-attached equipment, which may indicate loss of signal
input from this source.
2. Check the trib cable and connectors.
3. Check the configuration of the affected trib. Ensure correct line options are
selected.
4. Run a loop-back test on the affected trib using an external BER tester.
5. If the test is OK, the problem is in the attached equipment or cabling.
6. If the test fails, replace the DAC/IDU.
Additional Information
This alarm is raised at the affected end of the link only.
For an E1/DS1 trib, AIS will be inserted towards the TDM bus/radio, provided the
trib is ticked as commissioned in its Portal plug-ins screen.
Trib (#) Output AIS Enabled
Alarm indication signal transmitted on trib(s). This is a warning alarm.
Probable Cause
AIS has been enabled (forced) on the alarmed trib or tribs using commands in the
Portal System Controls screen. AIS can be forced on E1, DS1, E3, DS3, or STM1/OC3
tribs.
Recommended Actions
To remove the alarm, de-select AIS.
Additional Information
AIS may be selected to replace the normal signal to indicate to the receiving
equipment that there is a transmission interruption at the equipment originating the
AIS signal, or upstream of that equipment. In this user-enabled instance, AIS can be
used to test traffic or alarm continuity on uncommissioned (non-traffic carrying)
tribs, or to send a signal downstream to indicate traffic has been interrupted (for
example, a service check is being performed).
For E1, DS1, E3, DS3 tribs, AIS is generated as an unframed, all-ones signal.
For an STM1/OC3 trib, AIS selection inserts a PRBS15 pattern (15 bit pseudo-random
bit sequence).
The AIS enabled alarm is activated on a per trib basis.
Trib (#) Output Failure
The output to the customer equipment has failed. This is a critical alarm.
Probable Cause