9500 MXC User Manual
3DB 23063 ADAA - Rev 004 July 2007 Vol. IV-15-55
Figure 15-19. Ring Protection Locks
RAC/DAC East or West Diagnostics
For a RAC the East / West tabs provide access to Tx Mute, and to bus-facing IF
or digital loopbacks.
• These functions are identical to those for a Link/RAC or DATA/DAC 155oM.
Refer to Tx Mute and Loopback Selection on page 15-49, Committing a Tx
Mute will generate a signal loss alarm at the remote Node, which will force a
ring wrap at the remote and local Node.
For a DAC 155oM the East / West tabs provide access to:
• Line-facing or bus-facing Line Interface (optical trib) loopbacks.
• Transmit AIS on the optical Line Interface.
• Line-facing or radio-facing Bus Ports (NxE1/DS1)loopbacks.
All actions have a safety timer. Refer to Safety Timer Operation on page 15-50.
Online Lock West
Offline Lock West
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