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QMultiFlex-400™ Installation and Operating Handbook
7.4 Modem Redundancy Protection
Various levels of redundancy are supported.
Figure 7-8 shows a typical hub redundancy setup where transmit and receive services for
up to 64 remote sites are protected by a single backup unit. A PDQS redundancy switch
(and backup QMultiFlex-400™) is used to protect four QMultiFlex-400™.
Figure 7-8 QMultiFlex-400™ 1:4 Redundancy Setup (64 remotes sharing single
outbound)
However, users may want to consider independent protection for the hub Tx and Rx
functions, giving each their own separate backups, allowing for continued correct system
operation even in the event of multiple concurrent failures, leading to extremely high system
reliability and availability. In this scenario, we recommend using 1:1 protection for the Tx
services (since potentially large numbers of remotes all depend on a single shared
outbound carrier) and using a separate 1:N redundancy system where one backup unit is
shared between all of the Rx services, as shown in Figure 7-9.
7-10
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