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Digital Telephone IP Adapter Installation and Administration Guide 73
January 2005 Installing the Digital Telephone IP Adapter unit
Installing ferrite beads
The Digital Telephone Internal IP Adapter circuit card installation kit contains
two ferrite beads. Ferrite beads protect the Ethernet and power supply cable
from electromagnetic interference (EMI). The two heavy pieces of ferrite come
in a plastic-hinged cover that forms a block and has a hole in the middle for the
cable to pass through. You must install the ferrite bead close to the plug that
connects to the Digital Telephone Internal IP Adapter circuit card.
To install the ferrite beads for both the Ethernet cable and the power supply
cable:
1 Open the plastic latch at the side of the ferrite bead.
2 Lay a cable across the middle of the ferrite bead.
The ferrite bead must be close to the cable connector.
3 Loop the cable tightly around the ferrite bead.
There must 2 loops of Ethernet cable around the ferrite bead (the Ethernet
cable lays across the ferrite bead 3 times).
There must be 3 loops of power supply cable around the ferrite bead (the
power supply cable lays across the ferrite bead 4 times).
4 Close and latch the ferrite bead.
Note: You may need to adjust the cable loops to make them as tight as
possible.