Beta Draft Confidential
7-101/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
Configuring Trunks
About APS
CBX 3500 Notes:
• Intercard APS
– Uni-directional APS is not supported on the Universal IOP; only 
bi-directional APS is supported.
– Intercard APS is supported only between two Universal IOPs. It is not 
supported between a Universal IOP and an IOM1 in the CBX 3500.
• CID Server
CID Server functionality for the Universal IOP is not supported in this release. 
Once a port is configured for APS, CID space is partitioned into static allocation 
for each port on the Universal IOP.
• Universal IOP
• The CBX 3500 ATM Universal IOP supports both inter-card and intra-card 
APS, while the POS Universal IOP supports only intra-card APS.
See the Switch Module Configuration Guide 
for CBX 3500, CBX 500, GX 550, and 
B-STDX 9000 
for a listing of the minimum software and hardware versions that support 
the various APS options. 
The following sections summarize these options.
1-Port OC-48/
STM-16 Phy
UNI
a
, 
Direct 
trunk
b
PVC GR-253, 
G.783/
G.841 
Annex B
Bi-directional Non-revertive Inter-card
a
APS support provided by Resilient UNI.
b
APS support provided by APS trunk backup.
Table 7-2. Slow APS Support
Switch/
Modules
Logical 
Port
Circuit 
Type
Base 
Standard
Direction Reversion Inter or 
Intra 
card