Mitel 3000 Installation And Maintenance Manual page 59

Mitel 3000
Installation & Maintenance Manual
Power failure
In the event of a total system power failure, at least 50% of the equipped CO lines are switched to separate RJ11
connectors on the appropriate MDF. Lines 1 and 2 are power-failed to two RJ11 connectors on the base unit
MDF. Lines 5 and 6 are power-failed to two RJ11 connectors on the first Extension module MDF, lines 9 and 10
to two RJ11 connectors on the second Extension module, lines 13 and 14 to two RJ11 connectors on the third
Extension module and lines 17 and 18 to two RJ11 connectors on the fourth Extension module.
Standard two-wire phones are wired to these connectors and they can make and receive calls when the system is
powered down. The connectors can be wired to separate standard telephones or paralleled with extensions
equipped with standard phones.
The Feature Phones cannot be used as power failure phones. All power failure
phones must be standard DTMF telephone sets.
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