BusinessPhone Communication Platform 6.0
Installation Instruction ASB 150 02 > Boards for ASB 150 02

## VMU-D (ROF 157 5117/1)

The VMU-D has no switches, but is equipped with a back up battery, RNV 991 942/001 to prevent loss of data in case of a power failure. Install the battery to the connection field 4 before the exchange is started. For safe operation, replace this battery periodically every five years in accordance with document Maintenance Instruction (1541-ASB 150 02 Uen).

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