Alcatel-Lucent 9500 MXC User Manual page 654

Chapter 1. Commissioning
DAC Protection Test Procedure
Vol. V-1-16
Assumes a starting point of:
• Primary DAC is online for trib Tx and Rx, which is the configuration default.
• Tributary Protection (TT) is used.
The procedure is based on application of a trib BER test using an external tester
and confirming correct protection operation by withdrawing and inserting, in
turn, each DAC of the protection pairing.
The BER tester provides measurement of service interruption with an
errored-second count resolution. Refer to Test Measurement on page 1-7.
Test Procedure:
1. Apply a BER test on a trib with a radio-facing loopback at the remote DAC.
• Use an external BER tester with connection to the DAC pair via "Y"
trib-cable sets.
• Ensure the radio-facing loopback at the remote DAC pairing is applied to the
online Tx and Rx, and that it is set for the correct trib. If Tx and Rx are on
separate DACs, for example Tx is on primary and Rx on secondary, a radio
facing loopback must be applied to both.
This is confirmed and applied from the System/Controls screen for the
remote DAC pairing. It is not necessary to apply a Tx and Rx lock to the
online DAC(s), however application of the loopback will raise an AIS alarm.
CT screens for local and remote Nodes can be dragged to different parts of
your PC screen for easier management.
2. Withdraw the local online (default primary) DAC and confirm that service is
restored within a count of one errored second (possibly two). At this point the
secondary DAC is online for trib Tx and Rx.
When a card is unplugged the NCC status LED will flash orange and a
major alarm and a card missing icon will appear in the status bar of all CT
screens (bottom of screen).
3. Re-install the primary DAC and confirm that no Tx or Rx trib switch occurs;
tribs remain online with the secondary DAC.
4. Wait for 30 seconds, confirm that NCC and DAC status LEDs are green, then
withdraw the online secondary DAC and confirm that service is restored
within a count of one errored second (possibly two). At this point the primary
DAC is back online for trib Tx and Rx.
5. On completion of the tests ensure the remote loopback(s) are disabled, or will
time-out.
The tests can also be completed for a situation where the local DAC pairing has
one DAC online for Tx and the other for Rx. Use the System/Controls screen
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