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

## BTU-A (ROF 157 5110/_) and BTU-A2 (ROF 157 5120/_)

#### Call metering boards

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

#### Music source input

##### BTU-A2

On the BTU-A2 all trunk lines can be either be used as normal trunk line or as music source input.

##### BTU-A

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

Note

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

The definition whether trunk or music source is used, is defined 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 to be regarded as a music source input.

Different contact positions are not allowed.

#### Connections to BTU-A/BTU-A2

##### Power failure circuits

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

##### Earth connection on BTU-A2 (Austria only)

Some markets require an earth connection of the incoming PTT earth (functional earth) to the exchange. Use an extra Krone bar to connect the PTT earth wires to the wires going to the board connector.

Revision: E © Ericsson Enterprise 2003