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Installing Cable Accessories
Precautions for Installing Cable Accessories
Tools
Use dedicated tools provided or specified by Huawei and follow the installation procedure described here.
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.
Bending Radius
Unless otherwise specified, bending radius (R) of cables or fibers must meet the requirements listed in Table 14-7.
Table 14-7 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° |
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.
Installing Power Adapters
Installing the OT Terminal
Procedure
- Install an OT terminal.
- Align the hole of the OT terminal (conductor upward) with a connecting hole, as shown in Figure 14-1.
When you install an OT terminal, the crimping sleeve is installed as shown in Figure 14-2, where A is correct and B is incorrect.
- Place the spring washer and flat washer in turn, mount a matching
screw, and fasten it clockwise, as shown in Figure 14-3.
Ensure that the OT terminal is not in contact with other terminals or metal components.
- Move the cable slightly and ensure that it is securely connected, as shown in Figure 14-4.
- Align the hole of the OT terminal (conductor upward) with a connecting hole, as shown in Figure 14-1.
- Install two OT terminals on a post.
Before you install two OT terminals on a post, ensure that the two terminals can be installed on the post and that the electrical connecting pieces have a large contact area. Two OT terminals can be installed using any of these methods:
- Bend the upper OT terminal at a 45- or 90-degree angle, as shown in Figure 14-5.
- Cross the two terminals, as shown in Figure 14-6.
If the two terminals are different sizes, place the smaller one above the bigger one. A maximum of two terminals can be installed on a post.
- To remove an OT terminal, loosen the screw counterclockwise.
Installing the Cord End Terminal
Procedure
- Hold a cord end terminal upright and place it on a terminal jack, as shown in Figure 14-7. To ensure bump contact and dense connection, place the plain side of the terminal outwards.
- Insert the terminal into the jack vertically, and turn the screw clockwise to fasten the terminal, as shown in Figure 14-8.
- Ensure that the exposed section of the terminal is less than 2 mm (0.079 in.) in length.
- Do not press the insulation of the terminal.
- Insert only one terminal into one jack.
- Move the cable slightly and ensure that it is securely connected.
- Before you remove a cord end terminal, loosen the screw counterclockwise.
Installing Fiber Connectors
Installing an LC Fiber Connector
Procedure
- Remove the dustproof cap of the LC fiber connector and store it for future use.
- Align the core pin of the male connector with that of the female connector, as shown in Figure 14-9.
- Align the male connector with the fiber adapter and gently push the male connector until it is completely seated in the fiber connector, as shown in Figure 14-10.
- A clicking sound indicates that the male connector is locked, as shown in Figure 14-11.
- To disassemble an LC fiber connector, press the locking nut to release the locking clips from the bore, and gently pull the male connector, as shown in Figure 14-12.
Installing the SC Fiber Connector
Procedure
- Remove the dustproof cap of the SC fiber connector and store it for future use.
- Align the core pin of the male connector with that of the female connector, as shown in Figure 14-13.
- Feed the fiber connector into the female connector, with your fingers holding the shell of the fiber connector (not the pigtail). When you hear a click, the fiber connector is secured by the clips (internal parts, not illustrated in the figure). Pull the fiber connector gently. If the connector does not loosen, the installation is complete. See Figure 14-14.
- To disassemble an SC fiber connector, hold the shell of the connector (do not hold the fiber) and gently pull the connector in the direction vertical to the adapter. Unlock the male connector, and then separate it from the shell, as shown in Figure 14-15.
Installing an MPO Connector
Procedure
- Remove the dustproof cap of the MPO fiber connector and store it for future use.
- Align the core pin of the male connector with that of the female connector, as shown in Figure 14-16.
- Hold the shell labeled "PUSH" and feed the male connector into the female connector until you hear a clicking sound. The male and female connectors are securely installed, as shown in Figure 14-17.
- To disassemble an MPO fiber connector, hold the shell labeled "PULL" and remove the male connector, as shown in Figure 14-18.
