Aastra 677X: Extensions And Accessories; Power Supply Unit; Key Extensions - Aastra OpenCom 100 Series Mounting And Commissioning User Manual

Aastra 677x: Extensions and Accessories

Aastra 677x:
Extensions and Accessories

Power Supply Unit

The power supply unit 4516000 (in Britain operate only the AC adapter with the part
no. 4516001) is required in the following cases:
• when connecting a key extension to an Aastra 6773 / 6775 (OpenPhone 7x)
system telephone (see also the chapter Key Extensions starting on page 66)
• when using the Aastra 6773ip / 6775ip (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 68).

Key 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.
The following equipment combinations are possible:
66
.