Carrier Access Network Device Axxius 800 - Manual (Page 483)

Axxius 800 - Release 2.2 17-3
Low Speed Protection Card
Overview
The Backup Card
A Quad T1 or Quad DS1 ADPCM service card can be configured as the “Backup card”.
The Backup card provides T1 port protection for other installed T1 service cards, and
can occupy any one of the eight service card slots.
Note: It is imperative that the slot designated for the backup card have NO wire-
wrap connections.
Protected Cards
The Quad T1/Quad DS1 ADPCM service cards to be protected can occupy any of the
7 remaining service card slots (backup card occupies the 8th slot). One or all four ports
can be protected, though each series of ports (all 1s, 2s, 3s and port 4s) have one backup
T1 port. The Axxius system can use other service cards in any of the 8 service card slots
without interference with the Low Speed Protection system.
Port Backup and Prioritization:
Priorities can be set for these protected ports (1-7) where 1 is the highest priority and
the default setting is 7. If more than 1 fault occurs at the same time the port with the
higher priority is granted the protection. In cases where traffic from a lower priority
port is already switched to backup, the traffic is forced back to the failed port to provide
the higher priority traffic with the backup port. When port protection requests are set at
the same level, protection is granted on a "first come, first serve" basis.
Above port #1 of the backup card provides a single T1 backup to all the protected T1’s,
port #1 in the system. This scenario is the same for the Backup port #2, port #3, and
port #4.
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T1 Protected Cards
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