BusinessPhone Communication Platform 5.1
Installation Instruction ASB 150 02 > Boards for ASB 150 02

## Power failure circuit (PFC) on BTU‑A/BTU‑A2 and BTU-C

In the event of mains failure and if no back-up battery is connected to the PBX, a relay on the BTU-A and BTU-C (see under BTU-C on next page) board automatically switches the trunk lines (generally 2) to analogue telephones, if connected to this board.

If an ELU-A board is installed these telephones can be used during normal operation and in case of power failure they will be automatically connected to the public exchange.

#### Applies for indicex 3

The BTU-B provides connection for up to 8 physical links and every physical link can be configured as a S- or T-interface in point-to-point or multi-point mode. On the S-interface every link provides remote power feeding with 40V/50 mA = 2W and connection for up to 8 terminals.

Revision: E © Ericsson Enterprise 2003