Chapter 15. Diagnostics
Vol. IV-15-60 Alcatel-Lucent
•For an IF loopback traffic from the customer is looped back to the customer,
and at the remote end the resultant demodulator-unlock initiates AIS or
PRBS15 on all traffic circuits towards the remote bus/customer. All
cross-connected circuits from the remote RAC/radio, which for a Node may be
to DAC and/or other RAC plug-ins, will carry this AIS/PRBS.
Protected DAC Screens
For information on the protectable DACs refer to DAC/Tributary Protection on
page 3-92, Volume II, Chapter 3.
The opening DATA protection window identifies online Tx and Rx status for
primary and secondary RACs and supports:
• Application of Tx and Rx locks.
• Online status change.
The DAC (primary) and DAC (secondary) windows include the same loopback,
AIS and PRBS functionality displayed in Figure 15-20 on page 15-57 for a
non-protected DAC.
• It is possible to set this functionality for one or both DACs, but valid data will
only be presented by the online DAC.
AIS/PRBS15 may also be forced onto a DAC tributary using the System Control
screen.
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