Power Fail Transfer (Pft) Operation - Nortel Meridian 1 Option 11C Compact Technical Reference Manual

Power Fail Transfer (PFT) operation

The NTMW07 Line/Trunk card has a built-in Power Failure Transfer (PFT)
feature, selectable by Jumper J1. It is designed to operate with a loop start
trunk. This feature allows the connecting one trunk on the card to an analog
telephone on the same card in the event of a commercial power or system
failure.
Note: Ground start trunks require a telephone set equipped with a
ground start button to place outgoing calls when in PFT mode.
Power Fail Transfer (PFT) mode occurs under any of the following
conditions:
• The SSC card sends a signal to activate PFT
• A power failure occurs
• A CPU failure occurs
• The fiber link to an expansion cabinet fails (PFT for that cabinet only)
The Terminal Numbers (TNs) that are equipped to perform the PFT function
vary depending on the slot assignment in the cabinets. When a PFT occurs,
the following are connected:
• In the Main cabinet
— When the NTMW07 card is in slot 1 & 2
TN 01 03 connects to TN 02 03
(Trunk on Card 01 Unit 03 connects to the telephone on Card 02
Unitþ03)
— When the NTMW07 card is in slot 3 & 4
TN 03 03 connects to TN 04 03
(Trunk on Card 03 Unit 03 connects to the telephone on Card 04
Unitþ03)
— When the NTMW07 card is in slot 5 & 6
TN 05 03 connects to TN 06 03
(Trunk on Card 05 Unit 03 connects to the telephone on Card 06
Unit 03)
Meridian 1 Option 11C Compact
Chapter 4 — Power supplies Page 43 of 136
Technical Reference Guide