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Table Of Contents
Cables and Cabling
This appendix lists the pin-to-pin connections for cables used by the Cisco Metro 1500 series system. This appendix includes the following sections:
Serial Null Modem Cable
Table B-1 shows the null modem cable wiring. It shows the signaling between machines that allows you to use hardware RTS/CTS flow control.
UTP-X Cables
The cables described in this section interconnect systems either directly or through a network hub.
Male Cable Connector
To find pin 1 on a 10BASE-T plug, follow these steps:
Step 1 Hold the cable in your right hand with the connector up and the cable dangling down.
Step 2 Turn the connector around so that the flat side is toward you and the plastic tag is away from you.
Step 3 Pin 1 is to the left, as shown in Figure B-1.
Figure B-1 Male 10BASE-T Plug
Table B-2 lists cable specifications for 10BASE-T connectors.
Pin Connections
There is no specified color coding for cables under 10BASE-T. Color coding for wiring under the EIA/TIA-568B standard is given for use with striped twisted pair. Whether you are using striped twisted pair or solid color twisted pair, follow the appropriate wiring diagrams in Table B-2 and Table B-3.
Note It is important that wiring be done using twisted pairs. Pins 1 and 2 should be wired using one twisted pair and pins 3 and 6 should be wired using a second twisted pair.
Straight-through cables are used in a star-based setup to connect systems to a hub. Table B-2 contains the cabling diagram for a straight-through cable.
Crossover or X cables connect two systems directly together without using a hub. Crossover cables also connect stacked 10BASE-T hubs. Table B-3 contains the cabling diagram for a crossover cable.
Table B-4 contains the cable specification for the twisted pair wire used in wiring the cables.
Table B-4 Cable Specification
Power Cable Type Category100 ohm1
4-pair unshielded/shielded twisted-pair (UTP/STP)2
3 to 5
150 ohm3
2-pair shielded twisted-pair (STP)
3 to 5
1 Maximum segment distance = 100 meters
2 UTP/STP = unshielded twisted pair/shielded twisted pair
3 Maximum segment distance = 100 meters
Posted: Wed Apr 13 18:51:48 PDT 2005
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