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B-1
Cisco 1760 Modular Access Router Hardware Installation Guide
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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.
Appendix B Cabling Specifications
Ethernet Network Cabling Guidelines
B-2
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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-1 Straight-Through Ethernet Cable (RJ-45-to-RJ-45) Pinouts
RJ-45 Pin
1
1. Pins 4, 5, 7, and 8 are not used for signaling but for reducing radiated cable
emissions.
Signal Direction RJ-45 Pin
1 TX+ —> 1
2 TX– —> 2
3 RX+ <— 3
6 RX– <— 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 Category 3, 4, or 5 Category 5
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