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

## BTU-A2 (ROF 157 5120/_)

- BTU-A2 (ROF 157 5120/_)
  8 analogue trunk lines (for Austrian market only) with DDI and call metering (CM).
- BTU-A2 (ROF 157 51xx/_) subequipped
  4 analogue trunk lines (for Austrian market only) with DDI and call metering (CM).

In case of mains power failure 2 of the trunks can be through connected to analogue telephone extensions (Connection field 4a, phones to pins 26/28 and 30/32).

Board layout:BTU-A2, PCB revision R4x:

|  | Insert PROM RYS102 520/1 (Order number: LZYBS 203 5120) |

##### Power failure circuits

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

#### Connections to BTU-A2

##### 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: J © Ericsson Enterprise 2005