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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
distinguish between rolled, straight-through, and crossover cables, and when to use them. Use the
comparison guide found in the
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.
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
Hub
Crossover Crossover Straight
Straight
Switch
Crossover Crossover Straight
Straight
Router
Straight
Straight
Crossover Crossover
Workstation
Straight
Straight
Crossover Crossover
Note: The ports on Catalyst switches that run Cisco IOS
®
Software (Native) can be configured to act as
Layer 2 (L2) or Layer 3 (L3) ports. When you connect the RJ-45 cable from a Layer 3 port, which acts as a
router port, to other devices, use the previous table. In summary, the cables used do not change, regardless
of whether the port is configured to be in Layer 2 (switch port) or Layer 3 (router port) mode.
router port, to other devices, use the previous table. In summary, the cables used do not change, regardless
of whether the port is configured to be in Layer 2 (switch port) or Layer 3 (router port) mode.
Most Common Cable Connectors
These diagrams show some of the most common cable types and connectors used on Catalyst switches.
RJ-45
RJ-21 Telco