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

## ELU-A (ROF 157 5114/_)

#### Board layout

- ELU-A (ROF 157 5114/1)
  16 analogue extensions
- ELU-A2 (ROF 157 5114/2)
  16 analogue extensions with message waiting indication (based on polarity reversal)
- ELU-A (ROF 157 5114/3
  8 analogue extension (subequipped version of /1)

The ELU-A board is equipped with an automatic traffic limiter restricting the internal power dissipation on the board to a maximum of 12 W. This depends on both the line length and the number of lines busy.

When the power consumption exceeds this limit, no more lines can be accessed and - if at least two lines go on hook again - all lines are accessible again.

When connecting external voice (mailbox) systems, a maximum of 8 lines are recommended on each board. The remaining lines on the board are usable for low traffic extensions.

#### DIP-switches

The DIP switch 997, being used for the ground key detection, is only applicable on boards with following minimum revision.

- ROF 1575 114/1 R6A
- ROF 1575 114/2 R5A
- ROF 1575 114/3 R4A

Older revisions of these boards have a strap instead of the switch. If the ground key dectection needs to be disabled on these boards, cut off the wire strap, which is mounted on the same position as the DIP switch.

#### Connections to ELU-A

see Connection to ELU-A, ELU-D and ELU-D3

|  | Insert PROM RYS102 514/1 (Order number: LZYBS 203 5114) |

Revision: J © Ericsson Enterprise 2005