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Introduction  
This document is a guide to cables and connectors for Catalyst 6500/6000, 5500/5000, and 4500/4000 series 
switching modules and Catalyst 2900/3500 XL, 2940, 2970, 2950/2955, 3550, and 3750 series fixed-
configuration switches. AC power supplies, connectors, and cords for these switches are also covered. 
Prerequisites  
Requirements  
You should identify the part or model number of your switch/supervisor, switching module, or power 
supply in order to use this document effectively. Do this by visual inspection, or issue the 
show module 
command where possible. 
Components Used  
This document is not restricted to specific software and hardware versions. 
Conventions  
Refer to 
Cisco Technical Tips Conventions
 for more information on document conventions. 
Console and Aux Port Cables  
Different Catalyst Supervisor Engines use either a rolled or a straight-through cable in order to connect a 
terminal or modem to the console port. Refer to these documents for information on how to connect a 
terminal or modem to the console port of Catalyst series switches: 
• 
Connecting a Terminal to the Console Port on Catalyst Switches
  
• 
Connecting a Modem to the Console Port on Catalyst Switches
  
Auxiliary (AUX) ports on Layer 3 (L3) switches or modules behave much the same way as AUX ports on 
routers and are used to connect modems. Refer to 
Modem-Router Connection Guide
 for information on how 
to connect a modem to an AUX port. 
Which RJ-45 Ethernet Cable Do I Use?  
A common question that concerns RJ-45 unshielded twisted pair (UTP) Ethernet cable concerns how to 
distinguish between rolled, straight-through, and crossover cables, and when to use them. Use the 
comparison guide found in the 
Types of RJ-45 Cabling 
section of 
Cabling Guide for Console and AUX 
Ports
 in order to see the difference between these cables. 
Cables to Hubs, Switches, Routers, and Workstations  
Crossover and straight-through cables are used in order to connect switch ports or interfaces to network 
devices. Consult this table in order to see when to use each of these cable types. Find the device in the left-
hand column and match it up with another device in the top row. The intersection of these two devices gives 
you the cable type used to connect them together.  
 
Hub 
Switch 
Router  Workstation