Encyclopedia > Power failure transfer

  Article Content

Power failure transfer

In telecommunication, the term power failure transfer has the following meanings:

1. The switching of primary utilities to their secondary backup whenever the primary source operates outside its design parameters.

2. In telephony, a function, which, when activated in the event of a commercial power failure or a low-voltage battery condition at a subscriber location, supplies power to predesigned subscriber equipment via the central office trunk.

Note: Power-failure transfer is an emergency mode of operation in which one and only one instrument may be powered from each trunk line from the subscriber location to the central office.

Source: from Federal Standard 1037C

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article

... for the older Welsh kingdom of Powys, which occupied roughly the same area, which came to an end when it was absorbed into the kingdom of Gwynedd by Hywel Dda. Towns ...