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About the PathBuilder S24x, 26x, and 27x switch 1-5
Applications
Figure 1-4. Regional Concentrator Example
Cluster Application An important new feature available with the PathBuilder S24x, 26x, and 27x switch
is its use in a cluster. This allows as many as four PathBuilder S24x, 26x, and 27x
switches to act a single unit for the purposes of connectivity. Though configured and
managed as individual nodes, when the PathBuilder S24x, 26x, and 27x switches are
clustered together, devices attached to access ports on one node can have calls routed
out the network port of one of the other nodes.
The three high-speed ports on the PathBuilder S24x, 26x, and 27x switch
motherboard provide networking channels between the nodes to pass traffic from
network ports to access ports. The PathBuilder S24x, 26x, and 27x switch cluster
allows for high port count and throughput primarily in support of the regional
concentrator applications.
The example in Figure 1-5 is a full mesh cluster which means that any access link
can reach any host connection. If a PathBuilder S24x, 26x, and 27x switch node
within the cluster fails, only those links and host connections directly connected to
that node go down. Placement of host equipment, and use of redundant host
equipment can minimize the impact of any individual node failure. Furthermore,
Link Back Up features in the remotes can limit the degree of remote isolation if part
of the PathBuilder S24x, 26x, and 27x switch cluster fails.
PB S200
Branch XX
PB S200
PBX
Host
Central Site
Branch 1
PB S200
High-Speed Link
(Single Node or Cluster)