User guide

Power Supply Unit 61
Forum Phone 515 / 525 / 535: Extensions and Accessories
Forum Phone 515 /
525 / 535:
Extensions and
Accessories
Power Supply Unit
The power supply unit 90035810 is required in the following
cases:
z when connecting a key extension to a Forum Phone 525 / 535
system telephone (see also the chapter Key Extensions
starting on page 62)
z when using the Forum IPhone 525 / 535 IP system telephones
(with or without key extension) where no Power over LAN is
available in the network
Connecting the Power Supply Unit to an IP Telephone
The connector for the power supply unit is in the bottom of the
telephone’s casing and is indicated by the symbol .
1. Plug the power supply unit’s RJ45 jack into the socket
provided.
2. Pass the power supply unit’s cable through the recesses on the
underside of the IP system telephone.
3. Connect the power supply unit to the mains power supply (see
Connecting the Key Extension starting on page 63).