Hot-Standby And Space Diversity - Alcatel-Lucent 9500 MXC User Manual

Before You Begin

Hot-standby and Space Diversity

Local-alarm Tx Switching Procedure
3DB 23063 ADAA - Rev 004 July 2007
• For most tests Available/Unavailable time should not change, and the Severely
Errored Second count will mirror the Errored Second count.
• Ensure the link is operating alarm-free, and that path conditions are normal.
• For hot-standby and diversity use the System/Controls screen to check that both
have default primary and secondary RAC settings. If necessary, reset and
ensure Auto / Lock Off is selected.
• For a ring test ensure the node has been switched on for not less than 5 minutes
to ensure completion of internal system checks.
Before testing ring protection a node must have been switched on for not less
than 5 minutes to ensure completion of internal system checks and updates.
Regardless, no protection switch operation is permitted by the Node within a one
to two minute period from power-on, which is also the time typically required
before CT log-in is permitted.
Tx switching is not hitless. Rx path switching is hitless, providing the assigned
online Rx RAC is not withdrawn from its backplane.
Test procedures are provided for:
• Local alarm Tx switch: local Tx switch forced by local Tx alarm.
• Silent alarm Tx switch: local Tx switch forced from remote end by LOS (loss
of signal).
• Rx switch.
The procedure requires withdrawal, in turn, of RAC cards.
Test procedure:
1. Set a BER test on a DAC trib with a remote loopback. Confirm error-free
operation.
2. Withdraw the online Tx RAC (default primary) from its backplane to initiate
a Tx switch to the standby Tx (default secondary RAC).
3. Confirm that service is restored within a count of one errored second (possibly
two). Refer to Test Measurement on page 1-7.
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).
4. Re-install the primary RAC and confirm that no switch occurs; Tx online
9500 MXC User Manual
Vol. V-1-11