• The bending radius of a fiber optic cable is at least 20 times of its diameter, and the bending
radius of a breakout cable is at least 30 mm (1.18 in.).
• The bending radius of an E1/T1 cable must be at least three times its diameter.
• The bending radius of a signal cable must be at least five times its diameter.
Cable binding requirements
• Cables of the same type must be bound together.
• Different types of cables must be separately routed and bound, with a minimum distance of 30
mm (1.18 in.) from each other.
• The cables must be bound tightly and neatly. The sheaths of the cables must not be damaged.
• The cable ties must face the same direction, and those at the same horizontal line must be in a
straight line.
• The excess of the indoor cable ties is cut off. The excess of 5 mm (0.2 in.) of the outdoor cable
ties is reserved, and the cut surfaces are smooth without sharp edges.
• After cables are installed, labels or nameplates must be attached to the cables at their ends,
curves, and interconnection positions.
Security requirements
• When routing cables, avoid sharp objects, for example sharp edges on the wall. If necessary, use
tubes to protect the cables.
• When routing cables, keep the cables away from heat sources and use heat insulation materials to
insulate the cables from the heat sources.
• Reserve a proper distance (0.1 m or 0.33 ft is recommended) between equipment and cables
especially at the cable curves to protect the cables and equipment.
Indoor cabling requirements
• Route each cable into the room through the feeder window.
• Reserve drip loops for all cables outside the feeder window before routing them into the room.
Ensure that the radiuses of the drip loops are greater than or equal to the minimum bending
radiuses of the cables.
• When routing a cable into the room, ensure that a person is assisting you in the room.
• Apply waterproof treatment to the feeder window.
Outdoor Cabling Requirements
• After being connected to a ground clip on power cables, a ground cable must be routed
downwards to prevent water from entering the equipment to which the power cables connect.
• Protect outdoor cables against potential damage. For example, put the cables through tubes.
• The cables to be protected include AC power cables, transmission cables, and cables routed
underground.
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