Mitel SX-200 Documentation page 266

POWER FAILURE TRANSFER
Description
In the event of a common control or power failure which would cause
a major loss of call processing, preselected CO trunks are automati-
cally switched to designated extensions. Failure transfer may be se-
lected automatically under control of the system, or manually by set-
ting the console or maintenance panel transfer switches to TRANSFER.
When normal system operation is restored, calls on transfer circuits
remain in effect until the calls are terminated, then the circuits are
returned to normal operation. The POWER FAIL TRANSFER (PFT) control
switches on the Maintenance Panel may be used to locate and isolate
the source of Transfer condition. (See also Section MITL9105/9110-
Conditions
A maximum of six transfer circuits are provided by the SX-100
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system.
A maximum of 12 transfer circuits are provided by the SX-200
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system.
If a transfer takes place, calls on the transferred trunks and
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extensions are dropped.
When the system is returned to normal, existing PFT trunk calls
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Ground start trunks require a Ground-to-Loop convertor.
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If trunks are rotary dial only, DTMF telephones may not be used
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for dialing.
3 or 4 sets may not be used as Power Fail Transfer
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extensions.
Programming
None
Operation
Manual Transfer:
Set the console transfer switch to the TRANSFER position. The
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corresponding Maintenance Panel POWER FAIL TRANSFER CON-
TROL SWITCH must be set to ENABLE.
SECTION MITL9105/91
Page 211