Table 5-9
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.
Fiber
R ≥ 40 mm (1.57 in.); Bending angle > 90°
NOTE
The letter d indicates the diameter of a cable or fiber.
Precautions for Installation
l
Hold terminals of cables instead of pulling the cables themselves when installing or
removing cable components.
l
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.
l
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.
l
When removing densely aligned cables or fiber connectors, use dedicated pliers such as
cable-pulling pliers and fiber-pulling pliers.
l
Do not twist, bend, stretch, or extrude fibers during installation.
l
Cover the idle fiber connectors with dust caps. Remove the dust caps before using the
fiber connectors.
Requirements for Cable Routing
l
To protect cables, remove the burrs in the cable through-holes or install protective rings
in the holes.
l
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.
l
Bind or clean cables gently because cable distortion affects signal quality.
l
Keep cables away from moveable components such as doors.
l
Sharp objects must not touch cable wiring to prevent damage to cables.
l
To protect power cables, route power cables of the active and standby power modules
separately.
Installing Power Adapters
Installing the OT Terminal
R250D
Hardware Installation and Maintenance Guide
5 Appendix
Issue 01 (2016-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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