Cisco Systems 815 manual Ethernet Network Cabling Guidelines, 10BASE-T 100BASE-TX

Appendix B Cabling Specifications

Ethernet Network Cabling Guidelines

Table B-1	Ethernet Cable Pinouts
RJ-45			RJ-45
Pin1	Signal	Direction	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.

Ethernet Network Cabling Guidelines

Table B-2describes some guidelines for creating Ethernet networks. Figures 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		UTP Category 3, 4, or 5	UTP Category 5 or STP

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

	Cisco 815 Integrated Services Router Hardware Installation Guide
B-2	OL-9558-01