Aastra 470 - Connecting the Cable Screening

Installation
102
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
Note
In the case of an indirection connection make sure that the communica-
tion server’s earthing wire does not form any earth loops with the
earthed cable screenings of the installation cables leading up to the
(main) distribution frame. The cables should be kept as short as possible
and laid out in parallel.
4. 3. 2 Connecting the cable screening
When using shielded installation cables also use shielded RJ45 connectors. In this
way the shielding of the installation cables is automatically connected with the
housing of the communication server and therefore with the building earth.
Note
Connect the cable screens to one another at the splitting point only.
Observe the tree structure principle to prevent earth loops.
Fig. 22 Tree structure principle
X
No earth
loops
Communica-
tion server
Socket-outlets
(Main) distribution
board