Beta Draft Confidential
7-61/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring Trunks
About APS
About APS
The Automatic Protection Switching (APS) feature is available on all types of
CBX 3500, CBX 500, and GX 550 optical interfaces. APS allows you to protect
optical interfaces by provisioning a backup (protection) port that automatically takes
over for the primary (working) port when a physical layer fault or module failure
occurs.
You can use APS functions to backup ATM direct trunk ports on CBX 3500, CBX
500, or GX 550 switches. If an equipment failure occurs, APS provides line backup.
APS eliminates bandwidth reservation for the backup trunk.
APS Options
Different APS options are available depending on the type of Lucent switch module
and logical port in use. These options include:
• Intra-card APS 1+1
• APS with Trunk Backup
• APS Resilient UNI
• Fast Inter-card APS 1+1
Each of these APS options comply with relevant industry standards and use the same
criteria for switching between the working and protection port.
Table 7-1 on page 7-7 describes the Fast APS support in this release.
Note – Bellcore GR-253-CORE, ITU G.841, Annex B (formerly ITU G.783, Annex
B), and ITU G.841 section 7.1 (formerly ITU G.783, Annex A) standards form the
basis of the Lucent APS implementation. Review these specifications and standards
for further information on how you can use APS in a network environment.
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