Nortel 1000E Upgrade page 216

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Figure 130
Campus Redundancy with CP PM call servers co-located
NN43041-465 Standard 01.04
Appendix A: Upgrading to a High Availability system
LAN links to the switches fails, or the switch is out of service then the dual
homing feature allows the CS 1000E CP PM system to continue to function
normally. The HSP is connected directly from one CP PM call server to the
other CP PM call server and allows for redundancy between call servers.
July 2007