Operation - Mitel SX-200 Practices

Circuit Card Descriptions
Extensions to be used for PFT service cannot be SUERS~teiephones. They can be
pulse dialing or DTMF sets, depending on which types of dialing the CO trunks accept,
Operation
14.4 Power Fail Transfer occurs under any of the following conditions:
l
failure of the commercial AC power supply
l
operation of the force transfer switch
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failure of the -28 V power supply to the Main Control Card
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loss of sanity (malfunction) in the Main Control Card.
Normal operation is restored when the condition that caused it is rectified: power is
restored, controller sanity is re-established, transfer switch is set to Normal,
Table 14-l Power Fail Transfer Plug and Jack Connectlons
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Revision 0 9109-096-l 2!5-NA
Issue 1