Sagem 4450E - Manual (Page 105)

SAGEM 3P@C
3P@C Installation Manual
Page 5-4 Reproduction and communication in any form prohibited without the written permission of SAGEM SA
Figure 5-6 Direct overhead cabling from the outdoors of the top of a buildings to the
bottom floor without any protection
5.5. Other Requirements for Outdoor Cabling
Note
When connecting devices located in different buildings, you
are recommended to use optical cables for overhead cabling,
and don’t need to install any lightning arrestor.
If you cannot provide the optical fiber cable for outdoor cabling and have to use the twisted pair, pay attention to
the following cabling requirements:
If the shielding of Ethernet cables is required outdoors, you need to do as follows: Parallelize a steel wire outside
the PVC pipe and connect the wire with the lightning protection grounding of the building, in this way the
inductive lightning can be conducted the to the ground through the steel wire.
The Ethernet cables entering a building must be laid in a weak electricity metal rack or tube. The metal rack or
tube serves as the shielding layer of the cable and should be connected appropriately with integrated grounding
system. Note that the weak electricity conducting cable cannot share metal rack or tube with the strong electricity
conducting cable.
Note
If you cannot provide the optical fiber cable for outdoor
cabling and have to use the twisted pair, it is strongly
recommended to use the external lightning arrester for
lightning protection of the equipment. See the next section for
its installation. The external lightning arrester should be
provided by users themselves.
5.6. Installing External Lightning Arrester
The external lightning arrester is installed between the signal channel and the protected equipment using a serial
connection. The following figure shows its connection.
Figure 5-7 Connection of the external lightning arrester
2 U
External cable Transfer cable
Device
External lightning arrester
For specific installation procedure and precautions of the external lightning arrester, see the product instructions.
The basic installation procedures are as follows: