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101

Notes

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Release 6 introduced the CoRes Call

server with both the Call server and

Signalling server resident on the same

CPPM card running Linux. This is

achieved using a VxWorks emulator

(VxEll). Release 7 enhances this with

new hardware.

The Standard Availability call server can

support up to 40,000 users and has a

single CPPM card running VxWorks.

The High Availability call server adds a

second redundant CPU to enable

failover as well as well as reducing

downtime for system upgrades.

HA is sometimes referred to as Campus

Redundancy when the CPU’s are

housed in different locations. The

maximum distance is defined by the

speed of the High Speed Pipe link which

ensures the memory and FMD (Fixed

Media Device) are constantly

synchronised.

HS is a Rel 7 feature allowing the

“Clustering” of HA systems for even

greater user numbers.

CS 1000 Rel 7.5 16/04/2013

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