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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 Standalone and Redundant Card Configurations
Figure 4-2 MGX 8830 Switch with Redundant PXMs and SRMs
Because the relationship between PXM and SRM cards is preconfigured and cannot be changed, it is
important to install these cards in the proper slots to support the intended configuration. Use the
following guidelines when installing PXM and SRM cards:
• For redundant PXM1E installations, the card sets must be identical.
• If redundant PXMs are used and SRM services are required, redundant SRMs must be installed for
each bay that uses SRM services.
• For the MGX 8830 or MGX 8830/B, a redundant pair of SRMs provides services to all service
module slots in the switch.
• For the MGX 8850 (PXM1E/PXM45), MGX 8850/B switches and the MGX 8880 Media Gateway,
a redundant pair of SRMs provides services to only one bay. For example, to support redundant SRM
services in the lower bay, SRM cards must be installed in slots 31 and 32.
• When installing redundant SRMs for a MGX 8830 or MGX 8830/B switch or a single bay in a
MGX 8850 (PXM1E/PXM45) or MGX 8850/B switch, the redundant SRMs must use compatible
configurations. The switch cannot support two different SRM configurations in the same bay. The
following are valid SRM redundant configurations:
–
Two SRM-3T3/C
–
One SRM-3T3/C and one SRME/B with a BNC-3T3-M back card.
–
Two SRME
–
Two SRME/B
–
One SRME and one SRME/B
• The MGX 8880 Media Gateway supports only the SRME/B.
• When redundant SRMs are installed, both SRMs must use the same back card type.
• When installing redundant SRMs in a MGX 8850 (PXM1E/PXM45) or MGX 8850/B switch or a
MGX 8880 Media Gateway, you can install one SRM configuration in one bay and another type of
SRM configuration in the other bay. For example, the top bay might use SRME/B services and
BNC-3T3-M back cards, and the bottom bay might use SRME/B services and MGX-SMFIR-1-155
back cards.
• SRM cards are not supported on MGX 8950 switches.
89873
SRM SRM
PXM
PXM
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