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Appendix B Cabling Specifications
Ethernet Network Cabling Guidelines
B-2
Cisco 815 Integrated Services Router Hardware Installation Guide
OL-9558-01
Ethernet Network Cabling Guidelines
Table B-2 describes some guidelines for creating Ethernet networks. Figures
might vary, depending on the manufacturer of the network equipment.
Table B-1 Ethernet Cable Pinouts
RJ-45
Pin
1
1. Pins 4, 5, 7, and 8 are not used for signaling.
Signal Direction
RJ-45
Pin
1TX+ —>1
2TX– —>2
3RX+ <—3
6RX– <— 6
Table B-2 Ethernet Cabling Guidelines
Specification 10BASE-T 100BASE-TX
Maximum segment
length
100 meters 100 meters
Maximum number of
segments per network
5
• With Class I
repeaters: 1
• With Class II
repeaters: 2
Maximum hop count
1
1. Hop count = Routing metric used to measure the distance between a source and a destination.
4 • With Class I
repeaters: none
• With Class II
repeaters: 1
Maximum number of
nodes per segment
1024 1024
Cable type required UTP Category 3, 4, or 5 UTP Category 5 or STP