Specifications

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Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 7 Switch Operating Procedures
Managing Redundant APS Lines
Figure 7-3 shows an example of how this process operates in a standard APS configuration, where the
primary card monitors the working line and the secondary card monitors the protection line.
Figure 7-4 shows an example of how the APS communication process operates in a crossed APS
configuration, where the secondary card monitors the working line that is attached to the primary card,
and the primary card monitors the protection line that is connected to the secondary card.
Figure 7-3 Standard APS Configuration
AXSM front card
Secondary card
Standby card
AXSM front card
Primary card
Active card
Remote node
Protection line
Standby line
Signal
Backcard
Backcard
Backcard
APS connector
Tx 2
2
Tx RxRx 2
2
1
AXSM front card
Secondary card
Standby card
AXSM front card
Primary card
Active card
Local node
Backcard
APS connector
Tx
3
Backcard
Tx RxRx
4
3
5
Working line
Active line
11
BackcardBackcard
70054
Physical line