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NEAX2400 IPX Feature Programming Manual
Page 578 NDA-24297, Issue 1
P-3 Power Failure Transfer
P-3 Power Failure Transfer
General Description
This feature provides for certain specified trunks to be automatically connected to designated stations in the event
of a loss of AC power. It is normally used when the system is not equipped with reserve power.
Station Application
Operation is automatic if there is loss of input power to the system.
Service Conditions
1. If the Central Office is wired ground start, stations must be equipped with ground buttons to complete calls
over the exchange network.
2. Power failure station lines should not be wired to common bells. These require outside power sources and
will not operate.
3. Type of telephone set (DP or DTMF) connected to CO line via POWER FAILURE TRANSFER shall
correspond to the signaling system of the Central Office.
4. The maximum number of POWER FAILURE TRANSFER circuits per PIM is 24 (12 circuits per
package).
5. The Power Failure Trunk (PFT) and associated Central Office Trunk should be in the same PIM.
6. When the POWER FAILURE TRANSFER feature is activated, telephone service is limited to incoming
calls and/or outgoing calls via the serving Central Office. DID calls cannot be received.
7. D
term
s cannot be used as Power Failure stations.
8. All calls in progress and/or established calls are lost when a POWER FAILURE TRANSFER occurs.
When commercial power is restored, the NEAX2400 IPX is automatically re-initialized. Back-up service
is provided via the HDD unit to retain the following features:
CALL FORWARDING [C-2, C-2D, C-3, C-3D, C-5, C-5D]
SPEED CALLING - GROUP [S-23]
SPEED CALLING - STATION [S-21]
NAME DISPLAY DATA [N-28]
Interactions
1. A PFT circuit card is required.
2. The POWER FAILURE TRANSFER station and Central Office trunk must be on the same Module
Group.
3. When power is lost and the POWER FAILURE TRANSFER (PFT) feature is activated, telephone service
is limited to incoming and outgoing calls via the predesignated PFT stations.
4. DID service will be lost, as this service is dependent on the operational status of Incoming Register Trunks
(IRTs).
5. When power is lost, all calls (station-to-station and station-to-trunk) are lost. When power is restored, PFT
calls will stay up until manually disconnected by the participants. Service to the PFT stations is then
restored to normal.
Programming
No programming is required.