Aastra 677xip (OpenPhone 7x IP) System Telephones: Extensions and Accessories | Power |
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5.Aastra 677xip (OpenPhone 7x IP) System Telephones: Extensions and Accessories
5.1Power Supply Unit
The power supply unit 4516000 (in Britain operate only the AC adapter with the part no. 4516001) is required when using the Aastra 677xip (OpenPhone 7x IP) 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 47).
5.2Key Extensions
Up to three key extensions can be connected to system telephones: either three key extensions of the model Aastra M671 or three key extensions of the model Aastra M676. A combination of these key extensions is, however, not possible.
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