Huawei DBS3900 Installation Manual page 38

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Installation Guide
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Requirements for Special Cables
Ethernet Cable
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Power cable
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PGND cable
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Optical cable
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Issue 08 (2015-01-15)
A clearance is reserved at turns of a cable or the position close to a device, facilitating cable
and device maintenance. The recommended clearance is about 0.1 m.
A maximum of 100 Ethernet cables can be bundled if no PVC pipes are used. If pipes are
used, a maximum of 24 Ethernet cables can be led through a pipe. In this case, ensure that
1/3 space inside the pipes must be vacant.
Positions for routing power cables meet requirements of the engineering design.
Cables are routed only by qualified and trained personnel before all preparations are made.
Cables are routed in an untangled and orderly fashion.
PGND cables are buried in the ground or routed indoors. They cannot be routed overhead
before they are routed into the equipment room.
Outer conductors of coaxial cables and both ends of the shield layers on shielded cables
are in proper electrical contact with the metal surface of the equipment to which they are
connected.
PGND cables and signal cables are installed in an untangled and orderly fashion. A certain
distance is reserved between them to prevent interference from each other.
Fuses or switches are not allowed on PGND cables.
Other devices cannot be used for electrical connections of PGND cables.
All the metal parts in the equipment are reliably connected to the ground terminal.
Cables are routed in an untangled and orderly fashion.
Optical fibers cannot be bound at turns.
Optical fibers cannot be stretched with too much force or stepped on, and they are far away
from sharp objects. Heavy objects cannot be placed on optical cables.
When optical cables are routed, the extra length of the cables is coiled around special
devices, such as a fiber coiler.
Even strength is applied when optical cables are coiled and optical cables cannot be bent
in a forcible manner.
Vacant optical connectors are covered with dust-proof caps.
Fiber optic cables cannot be squeezed by the cabinet door when routed through the cabinet.
If optical cables need to be routed on the tower platform, the optical cables are routed along
the inner side of the guard rail and the distance between the guard rail and the cable is the
shortest one.
If optical cables need to be routed close to a device on the tower, the optical cables are
secured to the guard rail or pole with cable clips and the device cannot be far away from
the position for securing the optical cables.
If the optical cable close to a device on the tower is too long, the optical cables are wrapped
and secured to the tower.
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5 Installing an RHUB3908
33