Alcatel-Lucent 9500 MXC User Manual page 611

Tx Mute and Loopback Selection
3DB 23063 ADAA - Rev 004 July 2007
A Tx Mute applied on the online Tx of a hot standby or space diversity protected
pair will be interpreted by the remote receiver as a signal/path failure and result
in a 'silent transmitter' switch action (remote Node/Terminal signals the local
Node/Terminal to switch transmitter). If such a switch is not intended, first lock
the Tx selection (Tx Lock On).
A digital or IF loopback selection removes all payload traffic over the link (local
traffic to the selected link is looped back to the bus/customer interface).
Loopback selections are applied separately to each RAC/Terminal of a protected
pair. To ensure correct operation, a loopback (Digital or IF) must be applied to
both RACs/Terminals. Alternatively first ensure that one (primary or secondary)
is locked as both Tx and Rx online, and apply the loopback just to the online
RAC/Terminal.
9500 MXC User Manual
Vol. IV-15-49