Precautions for Installing Cable Accessories

The illustrations in this document may differ from actual situations, but the installation methods are the same. For example, in this document, the adapters of cable connectors have separate interfaces. In the actual situation, the adapters may have interfaces fixed on equipment.


Use dedicated tools provided or specified by Huawei and follow the installation procedure described here.

Bending Radius

Unless otherwise specified, bending radius (R) of cables or fibers must meet the requirements listed in Table 1.

Table 1 Bending radius of cables or fibers

Cable or Fiber

Bending Radius (R)

Ordinary cable

In normal cases, R ≥ 2d. When the cable is connected with a connector, R ≥ 5d.


Single-mode G.657A2 optical fiber: R ≥ 10 mm (0.39 in.), bending angle > 90°

Multi-mode A1b optical fiber: 30 mm (1.18 in.) ≤ R ≤ 40 mm (1.57 in.), bending angle > 90°

The letter d indicates the diameter of a cable or fiber.

Precautions for Installation

  • Hold terminals of cables instead of pulling the cables themselves when installing or removing cable components.
  • Do not insert a connector forcibly when the connector is blocked. Use a dedicated tool to pull out the connector. Install the connector again after you check that the pins are inserted properly.
  • Before tightening screws on cable connectors, ensure that the connectors are properly connected to their adapters. Tighten the screw with appropriate force using a flat-head or Phillips screwdriver instead of bare hands or an electric screwdriver. If the screw cannot be screwed into the tapped hole, determine the reason and try again. Do not apply too much force, or the screw or adapter may be damaged.
  • When removing densely aligned cables or fiber connectors, use dedicated pliers such as cable-pulling pliers and fiber-pulling pliers.
  • Do not twist, bend, stretch, or extrude fibers during installation.
  • Cover the idle fiber connectors with dust caps. Remove the dust caps before using the fiber connectors.

Requirements for Cable Routing

  • To protect cables, remove the burrs in the cable through-holes or install protective rings in the holes.
  • To ease the connection and to avoid stress, keep cable joints slack. After connecting multiple cables to a connector that has multiple interfaces, keep the cables slack to avoid generating stress.
  • Bind or clean cables gently because cable distortion affects signal quality.
  • Keep cables away from moveable components such as doors.
  • Sharp objects must not touch cable wiring to prevent damage to cables.
  • To protect power cables, route power cables of the active and standby power modules separately.
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
Next topic >