NPT-1020 Installation and Maintenance Manual
Commissioning Tests
ECI Telecom Ltd. Proprietary
6-5
Signal rate
34 Mbps
Timing
Internal clock
Inject error
Code error
Table
6-6: 45 Mbps tests
Framing
Unframed
Coding
B3ZS
Pattern
2 * 10-15 PRBS
Signal rate
45 Mbps
Timing
Internal clock
Inject error
Code error
N
OTE
: For SDH tests configure the test equipment according to the interface type being
tested.
Table
6-7: SDH tests
Signal rate
STM-1, STM-4, STM-16,
STM-64
Mapping
Any mapping (preferably bulk)
Pattern
2 * 10-15 PRBS
Signal rate
155.520 Mbps, 622.080 Mbps
Timing
Received clock
Inject error
BIP error
6.3.2
Network Timing Synchronization Test
This test checks that the NPT-1020 NEs synchronize properly and switch to the next priority clock source
when a failure occurs.
To perform network timing synchronization test:
1.
Define one NE as the (internal) timing source to which all other NEs are synchronized. This test can be
done with an external timing source, if requested.
2.
Define several priorities for the timing source.
3.
Disconnect the Rx fiber connected to the NE defined as the main timing source.
If the NE has two or more timing sources, it synchronizes to the second priority source, and an alarm is
generated for the missing main timing source.
If the NE has only one timing source, the NE timing is set as “hold-over” and an alarm is generated for the
main timing source. Another alarm is generated to indicate that there is no available timing source.
