Mitel MiVOICE BUSINESS, Engineering Manualline

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Typical Configurations
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UPGRADING THE SYSTEM
There are two reasons to upgrade a system – to increase the line size or to improve
performance.
With Mitel the network is the system, so it can also be expanded (and resiliency added) by
adding more controllers into a clustered "virtual system". Individual controllers can be upgraded
as shown below, or new controllers can be added into a cluster to create a larger virtual system.
Upgrade Rules
• The line size of any controller can be increased up to the defined maximum by the addition
of expansion modules (DSP, Echo Cancellers). In most cases it cannot be increased into
the next size range except by total replacement of the controller. The exception is upgrading
the MXe from the base 300 users to 1400 users.
• The CX, CXi and AX systems cannot be converted to MXe or LX systems due to differences
in hardware architecture. An upgrade requires replacement of the controller.
• If additional DSP resources are required for compression, install the DSP-II card. Existing
DSP modules used for telecom functions do not need to be replaced.
• The basic MXe can be upgraded with a second processor (E2T) to increase capacity. The
addition of a second power supply and a second hard drive with RAID (redundant array of
independent disks) controller to mirror data on both hard drives, will provide redundancy.
See “Controller Power Input” on page 91 for information about the use of a UPS to ensure
data integrity. Note that the MXe-II and MXe-III use different processor modules which
cannot be interchanged
• The performance of a system can only be improved by increasing the speed of the processor
and, in all cases, this means replacing the controller.
• The MXe cannot be upgraded to an MXe Server because there are differences beyond the
addition of the APC-MXe Server.