Ncc Protection With Npc Option - Alcatel-Lucent 9500 MXC User Manual

NCC Protection with NPC Option

3DB 23063 ADAA - Rev 004 July 2007
The NPC plug-in provides protection for NCC TDM bus management (bus
clock), and power supply functions. One NPC can be installed per INU/INUe.
Bus protection protects all tributary and auxiliary traffic; Alarm I/O is not
protected.
• Switching is not hitless for a TDM bus clock failure; restoration is within
200 ms, during which time all traffic on the node will be affected.
• Protection is hitless for a power supply failure. If the NCC converter or one of
its supply rails fails, the NPC will take over without interruption. And vice
versa.
When the TDM bus clock has switched to NPC control, it will not automatically
revert to NCC control on restoration of the NCC. Return to NCC control requires
either withdrawal/failure of the NPC, or use of diagnostic commands in the
System/Controls screen.
9500 MXC User Manual
Vol. II-3-101