BusinessPhone Communication Platform 5.1
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 power failure. Install the battery to 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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