BusinessPhone Communication Platform 7.0
Installation Instruction ASB 150 02 > Boards for ASB 150 02

## BTU-A (ROF 157 5110/_)

- BTU-A (ROF 157 5110/_)
  8 analogue trunk lines(for defined markets with DDI). The upper 4 individuals are switchable to music source inputs.
- BTU-A (ROF 157 5127/_) subequipped
  4 analogue trunk lines

Subboards for call metering (CM) can be mounted to the BTU-A. In case of mains power failure 1 to 4 of the trunks (market dependend) can be through connected to analogue telephone extensions (Connection field 4a, phones to pins 18/20, 22/24, 26/28 and 30/32).

Board layout: ROF 157 5110 /_, PCB revision R5x

BTU-A, ROF 157 5110/_, earlier than revision R5x:

#### Music source input

The upper four individuals of the BTU-A board, can either be used as music source inputs or as normal trunk lines.

Note

This function is not available on BTU-A sub-equipped ROF 157 5127/_.

The definition whether a trunk or a music source is used, is selected by the DIP switches 85-88.

On delivery from the factory both contacts are in the OFF position, which means that the line is a normal trunk.

When both contacts on a DIP-switch are set to position ON, the line is selected as a music source input.

Different contact positions are not allowed.

#### Call metering boards

see Connection of CM-boards on BTU-A and BTU-C

#### Connections to BTU-A

##### Power failure circuits

The number of power failure circuits (PFC) is market dependent.

BTU-A (ROF 157 5110/_):

ROF 157 5110 | PFC
/11 (Standard) | 2
/12 (Italy) | 4
/13 (Spain) | 4
/14 (Australia) | 1
/16 (GB a.NZ) | 4

BTU-A (ROF 157 5127/_) sub-equipped:

ROF 157 5127 | PFC
/11 (Standard) | 1
/12 (Italy) | 2
/13 (Spain) | 2
/14 (Australia) | 1
/16 (GB a.NZ) | 2

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

Revision: J © Ericsson Enterprise 2005