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DBS3900 LampSite 
Installation Guide 

7 Installing a pRRU3901 

 

Issue 08 (2016-05-30) 

Huawei Proprietary and Confidential         

Copyright © Huawei Technologies Co., Ltd. 

94 

 

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The bending radius of a signal cable must be at least five times of the diameter of the 
cable. 

 

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Cables of the same type are bound together. 

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Different types of cables must be separately routed with a minimum spacing of 30 mm 
and cannot be entangled.   

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The cables are bound tightly and neatly and the sheaths of the cables is intact. 

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The cable ties face the same direction and all cable ties bound at similar positions must 
be in a straight line.   

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The extra length of each indoor cable tie must be cut off. A slack of 5 mm is reserved for 
each outdoor cable tie before the extra length is cut off. All cut surfaces are without sharp 
edges.   

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Labels or nameplates are attached to both ends, joints, or turns of cables after they are 
installed.   

 

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The steel pipe or fire-resistant rigid polyvinyl chloride pipe should be used for the cable 
duct or for routing cables. The cross-sectional usage of the cable duct should be 30% to 
50% and that of the pipe for routing cables should be 25% to 30%. 

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Cables are placed away from sharp objects or wall burrs. If these positions are inevitable, 
protection pipes are required for the cables.   

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Cables are routed away from heat sources, or heat-insulation materials are added 
between cables and heat sources.   

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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.   

 

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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. 

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The point at which an Ethernet cable is bundled must be spaced 400 mm or less from the 
Ethernet port on a pRRU. 

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For the pRRU3901 used in the elevator engine room on the rooftop, generator set for the 
subway engine, and equipment room with central air conditioning, Ethernet cables must 
be led through metallic conduits that are reliably grounded at both ends. 

This section describes pRRU3901 cable connections. 

 List of pRRU3901 cables