Cisco Systems 78-13342-03 User Manual
APPENDIX
B
Cabling Specifications
This appendix describes cables and cabling guidelines for the router and contains
the following sections:
• Ethernet Cables
• Ethernet Network Cabling Guidelines
• Console Cable and Adapter
• VIC Cables and Pinouts
• Cables and Pinouts for 2-Port ISDN BRI Card
Note For detailed information about cables used with Cisco WICs and VICs, refer to
the Cisco WAN Interface Cards Hardware Installation Guide that comes with
each of the cards.
Ethernet Cables
This section describes the Ethernet cables that you use to connect the router to
your local Ethernet network. A 10/100BASE-TX router, such as the Cisco 1760
router, requiresCategory 5 twisted-pair cable. Table B-1 describes thepinoutsfor
an RJ-45-to-RJ-45 Ethernet cable.
78-13342-03
Cisco 1760 Modular Access Router Hardware Installation Guide
B-1
Ethernet Network Cabling Guidelines
Table B-1 Straight-Through Ethernet Cable (RJ-45-to-RJ-45) Pinouts
Appendix B Cabling Specifications
RJ-45 Pin
1
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-2 describes 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
length
Maximum number of
segments per network
Maximum hop count
Maximum number of
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.
100 meters 100 meters
5 • With Class I
• With Class II
1
4 • With Class I
• With Class II
1024 1024
repeaters: 1
repeaters: 2
repeaters: none
repeaters: 1
B-2
Cisco 1760 Modular Access Router Hardware Installation Guide
78-13342-03
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