Connecting two 2500s - Cisco routers back-to-back using a DCE/DTE Cable
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Description: To enable back-to-back communication over the Serial interfaces you have to perform a few tasks. These tasks are fairly straight forward as soon as you fathom things out. The first thing to do is to ascertain which is the DTE and which is the DCE interface. This can be done by physically looking at the cable connector type. If you are using X21 then the female connector is the DCE end.