Severity Assignment Test; Transmission Alarm-Handling Test - Eci Telecom NPT-1020 Installation And Maintenance Manual

NPT-1020 Installation and Maintenance Manual

6.3.8 Severity Assignment Test

This test, which is performed on one NPT-1020 NE, determines the level of urgency accorded to each alarm
and creates an alarm-handling protocol.
When a fault is detected or removed, the NE updates the status of the LEDs and reports the alarm
activation or clearing to the management station.
To perform a severity assignment test:
1. Disconnect a fiber from one of the optical interfaces. An SPI LOS alarm of critical severity appears on
the management station for the NPT-1020 and the MJR LED on the NPT-1020 panel turns on.
2. Reconnect the fiber. The SPI LOS alarm on the management station clears and the MJR LED on the
NPT-1020 panel turns off (only if there are no other alarms on the NPT-1020 unit).
3. Change the severity of the SPI LOS alarm to minor.
4. Disconnect a fiber from one of the optical interfaces. An SPI LOS alarm of minor severity appears on
the management station for the NPT-1020 and the MNR LED on the NPT-1020 panel turns on (only if
there is no critical or major alarm on the NPT-1020 unit).
5. Reconnect the fiber. The SPI LOS alarm on the management station clears and the MNR LED on the
NPT-1020 panel turns off (only if there is no other alarm on the NPT-1020 unit).

6.3.9 Transmission Alarm-Handling Test

This test verifies that the NPT-1020 NEs can recognize an alarm and send an alarm notification to the
management system, and that the management system displays it properly.
This procedure tests the following alarms: PDH-LOS, PDH-AIS, and SPI-LOS.
To perform a transmission alarm-handling test:
1. Create one unprotected trail of any rate between two NEs.
2. Connect PDH test equipment to one NE and perform a loopback at the other NE (in the relevant
endpoint ports).
3. Disconnect the Tx cable of the test equipment. The management station reports a LOS alarm for the
relevant PDH port.
4. Set the test equipment to transmit an AIS (AIS = on). The management station reports an AIS alarm
for the relevant PDH port.
5. Disconnect the Rx fiber of an optical port. The management station reports a LOS (SPI-LOS) alarm for
the relevant optical port.
If ALS = off, the management station reports a far-end optical port MS-RDI alarm.
If ALS = on, the management station reports a far-end optical port LOS alarm.
ECI Telecom Ltd. Proprietary
Commissioning Tests
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