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Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Chapter 4 Planning for Card Redundancy, Line Redundancy, and Bulk Distribution
Planning for Standalone and Redundant Line Configurations
Back card and line fault tolerance is provided by intercard APS. If the working line or the back card to
which it is connected fails, communications traffic is rerouted through the protection line and the back
card to which it is connected.
Figure 4-11 shows how a redundant AXSM card set uses intercard APS.
Figure 4-11 Redundant AXSM Configuration with Intercard APS
Figure 4-12 shows redundant SRMEs using intercard APS.
Figure 4-12 Redundant SRMEs with Intercard APS
When planning a redundant line configuration that uses intercard APS, consider the following
requirements:
• Not all cards support intercard APS. Table 4-1 lists all the card types and specifies which cards
support intercard APS.
• Card redundancy must be configured or verified as described in “1:1 Redundant Card Configuration
Guidelines,” which appears earlier in this chapter.
• Some PXM1E back card types require an APS mini-backplane to support intercard APS. The
PXM1E APS mini-backplane requirements are listed in Table 4-4.
• Redundant AXSM, MPSM, and VXSM cards must be installed in adjacent slots to support intercard
APS.
AXSM front cards AXSM back cards
1
2
45057
Midplane
1
2
1
2
1
2
Working line 1.1
Protection line 1.1
Protection line 1.2
Working line 1.2
Working line 2.1
Protection line 2.1
Protection line 2.2
Working line 2.2
89876
Primary SRM
back card
Primary SRM
front card
Secondary SRM
back card
Secondary SRM
front card
Working line 1.1
Protection line 1.1