Loss Of Signal (Los) Detection Test; Input Sensitivity Test; Equipment Power-On Test - Eci Telecom NPT-1020 Installation And Maintenance Manual

NPT-1020 Installation and Maintenance Manual

6.3.3 Loss of Signal (LOS) Detection Test

This test verifies that NEs recognize alarms and send an alarm notification to the management system for
viewing.
To perform a LOS detection test:
1. Create NEs and links through the management system.
2. Disconnect the Rx optical fiber from one of the modules. A LOS alarm at the SPI level of this module
port appears, together with other alarms generated by the disconnection.

6.3.4 Input Sensitivity Test

This test verifies that the input sensitivity of the NPT-1020 optical modules is according to specifications.
To perform an input sensitivity test:
1. Create one unprotected trail of any rate between two NEs.
2. Connect test equipment to one NE and perform a loopback at the other NE (in the relevant endpoint
ports).
3. Connect a variable optical attenuator to one of the fibers of the relevant trail, and set the attenuator
to 0 dB.
4. Increase the attenuation gradually until the test equipment displays a burst of errors.
5. Connect an OPM to the first Rx point after the variable optical attenuator and measure the total
power. The measured optical power level is the input sensitivity of the module.
Verify that the results are in accordance with the NPT Product Line System Specifications.
6.

6.3.5 Equipment Power-On Test

This test verifies that the NPT-1020 NEs continue operating properly after a power break, without operator
involvement.
To perform an equipment power-on test:
1. Create one unprotected trail of any rate between two NEs.
2. Connect test equipment to one NE and perform a loopback at the other NE (in the relevant endpoint
ports).
3. Shut off the power to one of the nongateway NEs within the relevant trail. Errors and an Alarm
Indication Signal (AIS) alarm appear in the test equipment. After approximately seven minutes, an "NE
disconnected" alarm appears in the management system current alarm list, and the NE icon turns
gray (indicates no communication).
ECI Telecom Ltd. Proprietary
Commissioning Tests
6-6