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Beta Draft Confidential
Configuring Trunks
About APS
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
1/19/05
7-11
Intra-card APS 1+1
The Intra-card APS 1+1 option is available for the modules shown in
. Using Intra-card APS 1+1, traffic can be switched between the working and
protection ports in less than 50 msec.
You configure both the working and protection ports on the same IOM or BIO card.
Intra-card APS 1+1 supports ATM UNI/NNI, direct trunk, and ATM OPTimum cell
trunk logical ports. You only have to configure one logical port on the working port.
This logical port is then internally shared with the protection port.
APS with Trunk Backup
The APS Trunk Backup option is available for all CBX 3500, CB 500, and GX 550
optical modules, except BIO-C. You can use the APS Trunk Backup option to protect
against module failure by provisioning the working port and the protection port on two
different switch modules.
This option can be used in conjunction with Lucent ATM direct cell trunk logical
ports. When configuring APS Trunk Backup, you have to provision a separate logical
port and a separate trunk on each working and protection port. For more information,
see
“Configuring APS Trunk Backup and Fast APS 1+1 for ATM Direct Trunks” on
Only one trunk is active at any given moment. If the primary trunk fails (times out),
the APS manager detects the link down message and performs an APS switchover to
the backup port. The APS Trunk Backup option provides both facility failure and
equipment failure protection.
Special Considerations
APS Trunk Backup on a CBX 500 — Configure the working and protection port on
different IOMs. See the Switch Module Configuration Guide
for CBX 3500, CBX 500,
GX 550, and B-STDX 9000
for more information.
Note – Since the working and protection port are on the same module, Intra-card APS
1+1 can protect against the failure of an individual port or physical link, but not the
failure of the entire module.
Note – As traffic is rerouted from a working trunk to a protection trunk during a
failure, the switchover speed may be less than that provided by Intra-card APS 1+1.
Summary of Contents for CBX 3500
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