H3C S12500X-AF Switch Series Hardware Reference-6W102

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04-Cables
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Cables

This chapter describes cables used for connecting network ports.

Table 1 Cable description

Cable

Port type

Application

Console cable

RJ-45 Ethernet port at one end and DB-9 port at the other end

Connects the console port of the switch to the console terminal

Ethernet twisted pair cable

RJ-45 Ethernet ports

Connects RJ-45 Ethernet ports to transmit data

Optical fiber

SFP+/SFP /CXP/CFP2/QSFP+/QSFP28 ports

Connects the fiber ports to transmit data

SFP+ copper cable

SFP+ ports

Connects SFP+ ports to transmit data

QSFP+ copper cable

QSFP+ ports

Connects QSFP+ ports to transmit data

QSFP28 copper cable

QSFP28 ports

Connects QSFP28 ports to transmit data

QSFP-DD copper cable

QSFP-DD ports

Connects QSFP-DD ports to transmit data

QSFP+ to SFP+ copper cable

QSFP+ port at one end and SFP+ port at the other end

Connects QSFP+ port at one end and SFP+ port at the other end

CXP fiber cable

CXP ports

Connects CXP ports to transmit data

 

Console cable

A console cable is an 8-core shielded cable, with a crimped RJ-45 connector at one end for connecting to the console port of the switch, and a DB-9 female connector at the other end for connecting to the serial port on the console terminal.

Figure 1 Console cable

 

RJ-45

Signal

DB-9

Signal

1

RTS

8

CTS

2

DTR

6

DSR

3

TXD

2

RXD

4

SG

5

SG

5

SG

5

SG

6

RXD

3

TXD

7

DSR

4

DTR

8

CTS

7

RTS

 

Ethernet twisted pair cable

An Ethernet twisted pair cable consists of four pairs of insulated wires twisted together. It mainly transmits analog signals and is advantageous in transmitting data over shorter distances. The maximum transmission distance is 100 m (328.08 ft).

RJ-45 connector

An Ethernet twisted pair cable connects network devices through the RJ-45 connectors at the two ends. Figure 2 shows the pinouts of an RJ-45 connector.

Figure 2 RJ-45 connector pinout diagram

 

Cable pinouts

EIA/TIA cabling specifications define two standards: 568A and 568B for cable pinouts.

·     Standard 568Apin 1: white/green stripe, pin 2: green solid, pin 3: white/orange stripe, pin 4: blue solid, pin 5: white/blue stripe, pin 6: orange solid, pin 7: white/brown stripe, pin 8: brown solid.

·     Standard 568Bpin 1: white/orange stripe, pin 2: orange solid, pin 3: white/green stripe, pin 4: blue solid, pin 5: white/blue stripe, pin 6: green solid, pin 7: white/brown stripe, pin 8: brown solid.

Cable type

Based on performance

Ethernet cables can be classified as category 3, category 4, category 5, category 5e, category 6, category 6A, and category 7 cables based on performance. Category 5, category 5e, and category 6 are the most commonly used twisted pair cables on LANs.

Table 2 Ethernet cable description

Type

Description

Category 5

Transmits data at a maximum speed of 100 Mbps, with a bandwidth of 100 MHz.

Category 5e

Transmits data at a maximum speed of 1000 Mbps, with a bandwidth of 100 MHz.

Category 6

Transmits data at a speed higher than 1 Gbps, with a bandwidth of 250 MHz.

Category 6A

Transmits data at a speed higher than 10 Gbps, with a bandwidth of 500 MHz.

Category 7

Transmits data at a speed higher than 10 Gbps, with a bandwidth of 600 MHz.

 

 

NOTE:

Connect 10-Gigabit RJ-45 ports on the switch by using category 6A or category 7 twisted pair cables. Connect other RJ-45 ports on the switch by using category 5 or above twisted pair cables.

 

Based on pinouts

Ethernet twisted pair cables can be classified into straight through and crossover cables based on their pinouts.

·     Straight-throughThe pinouts at both ends comply with standard 568B, as shown in Figure 3.

·     CrossoverThe pinouts at one end comply with standard 568B, and those at the other end comply with standard 568A, as shown in Figure 4.

Figure 3 Straight-through cable

 

Figure 4 Crossover cable

 

Pin assignments

Select an Ethernet twisted pair cable according to the RJ-45 Ethernet interface type on your device. An RJ-45 Ethernet interface can be MDI (for routers and PCs) or MDIX (for switches). For the pinouts of RJ-45 Ethernet interfaces, see Table 3 and Table 4.

Table 3 RJ-45 MDI interface pinouts

Pin

10BASE-T/100BASE-TX

1000BASE-T

Signal

Function

Signal

Function

1

Tx+

Send data

BIDA+

Bi-directional data cable A+

2

Tx-

Send data

BIDA-

Bi-directional data cable A-

3

Rx+

Receive data

BIDB+

Bi-directional data cable B+

4

Reserved

N/A

BIDC+

Bi-directional data cable C+

5

Reserved

N/A

BIDC-

Bi-directional data cable C-

6

Rx-

Receive data

BIDB-

Bi-directional data cable B-

7

Reserved

N/A

BIDD+

Bi-directional data cable D+

8

Reserved

N/A

BIDD-

Bi-directional data cable D-

 

Table 4 RJ-45 MDI-X interface pinouts

Pin

10BASE-T/100BASE-TX

1000BASE-T

Signal

Function

Signal

Function

1

Rx+

Receive data

BIDB+

Bi-directional data cable B+

2

Rx-

Receive data

BIDB-

Bi-directional data cable B-

3

Tx+

Send data

BIDA+

Bi-directional data cable A+

4

Reserved

N/A

BIDD+

Bi-directional data cable D+

5

Reserved

N/A

BIDD-

Bi-directional data cable D-

6

Tx-

Send data

BIDA-

Bi-directional data cable A-

7

Reserved

N/A

BIDC+

Bi-directional data cable C+

8

Reserved

N/A

BIDC-

Bi-directional data cable C-

 

To ensure normal communication, the pins for sending data on one port should correspond to the pins for receiving data on the peer port. When both of the ports on the two devices are MDI or MDIX, a crossover Ethernet cable is needed. A cross-over cable connects devices of the same type. When one port is MDI and the other is MDIX, a straight-through Ethernet cable is needed. A straight-through cable connects devices of different types.

An RJ-45 Ethernet interface with MDI/MDIX autosensing enabled can automatically negotiate pin roles. The S12500X-AF RJ-45 Ethernet interfaces support MDI/MDIX. By default, MDI/MDIX is enabled on a port.

Making an Ethernet twisted pair cable

1.     Cut the cable to length with the crimping pliers.

2.     Strip off an appropriate length of the cable sheath. The length is typically that of the RJ-45 connector.

3.     Untwist the pairs so that they can lie flat, and arrange the colored wires based on the wiring specifications.

4.     Cut the top of the wires even with one another. Insert the wires into the RJ-45 end and make sure the wires extend to the front of the RJ-45 end and make good contact with the metal contacts in the RJ-45 end and in the correct order.

5.     Crimp the RJ-45 connector with the crimping pliers until you hear a click.

6.     Repeat the above steps with the other end of the cable.

7.     Use a cable tester to verify the connectivity of the cable.

Optical fiber

CAUTION

CAUTION:

Use the same types of transceiver modules, pigtail cords, patch cords, and fiber cables. If you use single-mode optical fibers, the transceiver modules, pigtail cords, patch cords, and fiber cables must be single-mode.

 

Optical fiber

Optical fibers are widely used in fiber-optic communications, which are advantageous for long-distance communications.

Optical fibers can be classified into the following types:

·     Single mode fiberIt has a core size of 10 µm or smaller, and has a lower modal dispersion. It carries only a single ray of light. It is mostly used for communication over longer distances.

·     Multi-mode fiberIt has a core size of 50 µm or 62.5 µm or higher, and has a higher modal dispersion than single-mode optical fiber. It is mostly used for communication over shorter distances.

Table 5 Allowed maximum tensile force and crush load

Period of force

Tensile load (N)

Crush load (N/mm)

Short period

150

500

Long term

80

100

 

Optical fiber cable

An optical fiber cable is a cable containing one or more optical fibers. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube. Optical fiber cables fall into single-mode and multi-mode.

Patch cord

A fiber that has connectors at both ends is called a patch cord. A patch cord connects one optical device to another for signal routing. Patch cords fall into single-mode and multi-mode patch cords.

·     Single-mode patch cordThe jacket is yellow. It permits transmission over longer distances.

·     Multi-mode patch cordThe jacket is orange. It permits transmission over shorter distances.

Patch cords are classified into SC, LC, FC, and so on based on interface type. The length of a patch cord can be 0.5 m (1.64 ft), 1 m (3.28 ft), 2 m (6.56 ft), 3 m (9.84 ft), 5 m (16.40 ft), 10 m (32.81 ft), and so on.

Pigtail cord

A pigtail cord is an optical fiber that has an optical connector on one end and a length of exposed fiber on the other. The end of the pigtail is fusion spliced to a fiber, connecting the fiber cable and transceiver.

Pigtail cords fall into single-mode (yellow) and multi-mode (orange), and can also be classified into SC, LC, FC, and so on based on interface type.

Fiber connector

Fiber connectors are indispensable passive components in an optical fiber communication system. They allow the removable connection between optical channels, which makes the optical system debugging and maintenance more convenient and the transit dispatching of the system more flexible.

Figure 5 MPO connector

 

Figure 6 LC connector

 

Precautions

·     Make sure the fiber connector and fiber type match the transceiver module type.

·     The fiber ports on the switch are provided with dust plugs. Insert the dust plugs into the fiber ports that you are not to use, to prevent particles from entering the ports.

·     Fiber connectors must be protected under safe and reliable outer packing, and be fitted with dust caps. Fiber connectors must be installed with dust caps when they are not in use. Take care not to scratch their end face. Replace the dust cap if it is loose or polluted.

·     Before connecting a fiber, use dust free paper and absolute alcohol to clean the end face of the fiber connector. You can brush the end face only in one direction. You also need to brush the end face of the fiber port.

·     Never bend or curve a fiber when connecting it. After a fiber is installed well, the bend radius must be not less than 40 mm (the minimum dynamic bend radius is 20 D, and the minimum static bend radius is 10 D. D indicates the outer diameter of dust caps).

·     If the fiber has to pass through a metallic board hole, the hole must have a sleek and fully filleted surface (the filleting radius must be not less than 2 mm). When passing through a metallic board hole or bending along the acute side of mechanical parts, the fiber must wear jackets or cushions.

·     Insert and remove a plug with care. Never exert a fierce force to the fiber or plug; otherwise the plug might be damaged or the fiber might be broken. Never pull, press or extrude the fiber fiercely. For the allowed maximum tensile load and crush load, see Table 5.

SFP+ copper cable

You can use SFP+ copper cables to connect the SFP+ ports.  The SFP+ copper cables available for the switch series are 10 G SFP+ Cu cables, as shown in Figure 7.

Figure 7 SFP+ copper cable

07-SFP+电缆

 

QSFP+ copper cable

You can use QSFP+ copper cables to connect the QSFP+ ports.

Figure 8 QSFP+ copper cable

JG326A_HP X241 40G QSFP QSFP 1m Direct Attach Copper Cable.png

 

QSFP28 copper cable

You can use QSFP28 copper cables to connect the QSFP28 ports.

Figure 9 QSFP28 copper cable

JG326A_HP X241 40G QSFP QSFP 1m Direct Attach Copper Cable.png

 

QSFP-DD copper cable

You can use QSFP-DD copper cables to connect the QSFP-DD ports.

Figure 10 QSFP-DD copper cable

 

QSFP+ to SFP+ copper cable

A QSFP+ to SFP+ copper cable is a cable with one QSFP+ module at one end and four SFP+ modules at the other end.

Figure 11 QSFP+ to SFP+ copper cable

JG329A_HP X242 40G QSFP to 4x10G SFP+ 1m Direct Attach Copper Splitter Cable.png

 

CXP fiber cable

You can use CXP fiber cables to connect the CXP ports.

Figure 12 CXP fiber cable

CXPCXP-AOC-30M_F_1406.png

 

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