Appendix B Cabling Specifications

Ethernet Network Cabling Guidelines

Table B-1 Straight-Through Ethernet Cable (RJ-45-to-RJ-45) Pinouts

RJ-45 Pin1

Signal

Direction

 

RJ-45 Pin

1

TX+

—>

1

 

 

 

 

 

 

2

TX–

—>

 

2

 

 

 

 

 

3

RX+

<—

3

 

 

 

 

 

 

6

RX–

<—

 

6

 

 

 

 

 

1.Pins 4, 5, 7, and 8 are not used for signaling but for reducing radiated cable emissions.

Ethernet Network Cabling Guidelines

Table B-2describes guidelines for creating Ethernet networks. Numbers might vary, depending on the manufacturer of the network equipment.

Table B-2 Ethernet Cabling Guidelines

Specification

10BASE-T

100BASE-TX

 

 

 

Maximum segment

100 meters

100 meters

length

 

 

 

 

 

 

 

Maximum number of

5

•

With Class I

segments per network

 

 

repeaters: 1

 

 

•

With Class II

 

 

 

repeaters: 2

 

 

 

 

Maximum hop count1

4

•

With Class I

 

 

 

repeaters: none

 

 

•

With Class II

 

 

 

repeaters: 1

 

 

 

Maximum number of

1024

1024

nodes per segment

 

 

 

 

 

 

Cable type required

Category 3, 4, or 5

Category 5

 

 

 

 

1.Hop count = routing metric used to measure the distance between a source and a destination.

 

Cisco 1760 Modular Access Router Hardware Installation Guide

B-2

78-13342-03

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Cisco Systems 78-13342-03 appendix Ethernet Network Cabling Guidelines, RJ-45 Pin Signal Direction, Specification
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78-13342-03 specifications

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