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Hardware Installation and Maintenance Guide

CloudEngine 8800, 7800, 6800, and 5800

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Assembling Ethernet Cables

Assembling Ethernet Cables

Assembling the Shielded RJ45 Connector and Ethernet Cable

Context

Figure 14-15 shows the components of an RJ45 connector and a shielded Ethernet cable.

Figure 14-15 Shielded RJ45 connector and cable

A. Jacket of connector

B. Metal shell of connector

C. Wire holder of connector

D. Plug of connector

E. Jacket of Ethernet cable

F. Shield layer of Ethernet cable

G. Twisted-pair wires

-

Procedure

  1. Fit the jacket of the connector onto the Ethernet cable, as shown in Figure 14-16.

    Figure 14-16 Fitting the jacket of the connector onto the Ethernet cable

  2. Remove a 30 mm (1.18 in.) long section of the jacket, cut off the nylon twine inside the jacket, and cut a no more than 5 mm (0.20 in.) cleft in the jacket, as shown in Figure 14-17.

    • When you remove a section of the jacket, do not damage the shield layer of the twisted-pair cable.
    • When you remove the shield layer, do not damage the insulation of the twisted-pair cable.
    Figure 14-17 Removing the jacket of a twisted-pair cable (unit: mm (in.))

  3. Fit the metal shell onto the twisted-pair cable. The shield layer is covered by the metal shell, as shown in Figure 14-18.

    Figure 14-18 Fitting the metal shell onto the twisted-pair cable

  4. Fit the metal shell onto the twisted-pair cable until the shield layer is covered completely. Along the edge of the metal shell, cut off the aluminum foil shield layer and ensure that there is no surplus copper wire. The exposed twisted-pair cable is about 20 mm (0.79 in.) long, as shown in Figure 14-19.

    Figure 14-19 Removing the shield layer of a twisted-pair cable (unit: mm (in.))

  5. Lead the four pairs of twisted-pair wires through the wire holder, as shown in Figure 14-20 and Figure 14-21. Ensure that the colored wires are in the correct location in the cable.

    Figure 14-20 Leading wires through the wire holder

    Figure 14-21 Cable locations in a wire holder

  6. Align the four pairs of cables in the holder, as shown in Figure 14-22. The connections between the wires and the pins are shown in Figure 14-23 and listed in Table 14-14.

    Figure 14-22 Four pairs of cables on a wire holder

    Figure 14-23 Connections between wires and pins

    Table 14-14 Connections between wires and pins (using a straight-through cable as an example)

    Matching Pins of Wires

    Wire Color

    1

    White-Orange

    2

    Orange

    3

    White-Green

    4

    Blue

    5

    White-Blue

    6

    Green

    7

    White-Brown

    8

    Brown

  7. Cut off the surplus cables along the lower edge of the wire holder, as shown in Figure 14-24.

    Figure 14-24 Cutting off surplus cables

  8. Put the connector body onto the wire holder and turn the metal shell by 90°, as shown in Figure 14-25.

    NOTE:

    Ensure that the wire holder is in good contact with the connector body.

    Figure 14-25 Putting the connector body onto the wire holder

  9. Push the metal shell toward the connector body until the wire holder and the connector body are engaged completely. Crimp the connector, as shown in Figure 14-26.

    Figure 14-26 Crimping the connector

  10. Push the jacket towards the metal shell until the metal shell is covered. This completes the assembly of one end of the cable, as shown in Figure 14-27.

    Figure 14-27 Pushing the metal shell

  11. To complete the assembly of the other end, repeat steps 1 to 10.

Assembling an Unshielded RJ45 Connector and Ethernet Cable

Context

Figure 14-28 shows the components of an unshielded RJ45 connector and cable.

Figure 14-28 Components of an unshielded RJ45 connector and cable

A. Plug of connector

B. Jacket

C. Twisted-pair wires

Procedure

  1. Remove a 16-mm (0.63 in.) long section of the jacket, as shown in Figure 14-29.

    When you remove the shield layer, do not damage the insulation of the twisted-pair cable.

    Figure 14-29 Removing the jacket of a twisted-pair cable (unit: mm (in.))

  2. Align the four pairs of wires and cut the ends neatly, as shown in Figure 14-30. The connections between the wires and the pins are listed in Table 14-15.

    Figure 14-30 Connections between wires and pins (unit: mm (in.))

    Table 14-15 Connections between wires and pins (using a straight-through cable as an example)

    Matching Pins of Wires

    Wire Color

    1

    White-Orange

    2

    Orange

    3

    White-Green

    4

    Blue

    5

    White-Blue

    6

    Green

    7

    White-Brown

    8

    Brown

  3. Feed the cable into the plug, and crimp the connector, as shown in Figure 14-31.

    NOTE:

    When inserting the cable, check from the side or bore of the plug to ensure that the cable is completely seated in the plug.

    Figure 14-31 Crimping the connector

  4. To complete the assembly of the other end, repeat steps 1 to 3.

Checking the Appearance of Contact Strips

Context

  • To ensure proper contact between the crimped wires and the wire conductors, the heights and sizes of the contact strips must be standard and the same.
  • The contact strips must be parallel to each other, with an offset of less than ± 5°. The top margin of a strip must be parallel to the axis of the connector, with an offset of less than ± 10°.
  • To ensure conductivity, the surface of the contact strips must be clean.
  • The contact strips must be in good contact with the RJ45 socket. The plastic separators must remain intact and be aligned.
  • The contact strip blade must extend beyond the ends of the wires. The ends of the wires must be in contact with the edge of the RJ45. The distance between them must be less than 0.5 mm (0.02 in.).

Procedure

  1. Hold the crimped connector, with the front side facing you, and check whether the contact strips are of the same height. The height should be 6.02 ± 0.13 mm (0.237 ± 0.005). If a measuring tool is not available, you can compare the connector with a standard connector. Figure 14-32 shows an unqualified piece, and Figure 14-33 shows a qualified piece.

    NOTE:

    All unqualified pieces must be crimped again.

    Figure 14-32 Contact strips of different heights

    Figure 14-33 Contact strips of the same height

  2. Hold an RJ45 connector and turn it 45°. Observe the top edges of the metal contact strips. Figure 14-34 shows an unqualified piece.

    Figure 14-34 Unparallel contact strips of different heights

  3. Check whether the contact strips are clean. If they are not clean and the dirt cannot be removed, replace it with a new RJ45 connector. Figure 14-35 shows an unqualified piece.

    Figure 14-35 Dirt on a contract strip

  4. Check whether the contact strips and the plastic separators are well aligned and intact. If a separator is skewed and cannot be fixed, replace it with a new RJ45 connector. Figure 14-36 shows an unqualified piece.

    Figure 14-36 Skewed plastic separators

  5. Hold the connector with the side facing towards you, and check whether you can see the cross-sections of the wires. Ensure that the ends of the wires are in good contact with the edge of the RJ45, and that the contact strip blade extends beyond the ends of the wires and is crimped with the wires. If not, replace the connector. Figure 14-37 shows an unqualified piece.

    Figure 14-37 Wires not in good contact with the edge of the RJ45

Testing the Connection of Assembled Cables

Context

Huawei provides two types of Ethernet cables: straight-through cables and crossover cables.

  • Straight-through cables are connected in a one-to-one manner. They are used to connect terminals such as a computer or switch to network devices. Table 14-16 lists the connections of core wires in a straight-through cable.
    Table 14-16 Connections of core wires in a straight-through cable

    RJ45 Connector 1

    RJ45 Connector 2

    Core Wire Color

    Twisted or Not

    2

    2

    Orange

    Twisted

    1

    1

    Orange-White

    6

    6

    Green

    Twisted

    3

    3

    Green-White

    4

    4

    Blue

    Twisted

    5

    5

    Blue-White

    8

    8

    Brown

    Twisted

    7

    7

    Brown-White

  • Crossover cables are connected in a crossover manner. They are used to connect terminals such as two computers or switches. Table 14-17 lists the connections of core wires in a crossover cable.
    Table 14-17 Connections of core wires in a straight crossover cable

    RJ45 Connector 1

    RJ45 Connector 2

    Core Wire Color

    Twisted or Not

    6

    2

    Orange

    Twisted

    3

    1

    Orange-White

    2

    6

    Green

    Twisted

    1

    3

    Green-White

    4

    4

    Blue

    Twisted

    5

    5

    Blue-White

    8

    8

    Brown

    Twisted

    7

    7

    Brown-White

Figure 14-38 shows the pins of an RJ45 connector.

Figure 14-38 Pins of an RJ45 connector

Procedure

  1. Feed both connectors of the cable into the ports of the cable tester.
  2. After the connectors are properly inserted, turn on the tester. If the indicators from 1 to G turn on simultaneously, you can infer that the pins work normally and the wires are correctly connected.

    NOTE:

    Turn the switch to the S position to slow down lighting of the indicators so that you can see the indicators more clearly, as shown in Figure 14-39.

    Figure 14-39 Testing the conduction and connections of wires

  3. Gently shake the connector and repeat 2 to check whether the metal contact strips are in good contact with the core wires and Ethernet ports, as shown in Figure 14-40.

    Figure 14-40 Checking the reliability

    The procedure for testing a crossover cable is the same as that for testing a straight-through cable except for the sequence in which the indicators turn on, which depends on the wire connections of a crossover cable.

    The Ethernet cable is qualified if the indicators turn on in the following sequence:

    At the master (left) section of the tester, the indicators turn on in the sequence of 1-8-G. At the slave (right) section of the tester, the indicators turn on in the sequence of 3-6-1-4-5-2-7-8-G.

    If the indicators do not come on in this sequence, the Ethernet cable is unqualified.

    NOTE:

    If a tester is not available, you can use a multimeter to perform a simple test, as shown in Figure 14-41.

    Figure 14-41 Testing the connection of an Ethernet cable

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Updated: 2019-03-21

Document ID: EDOC1000036822

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