You can find the possible values by using help. With the exception of the following standard values not subject to rounding,ġ200 2400 4800 9600 14400 19200 28800 38400Īccepted clockrates will be bestfitted (rounded) to the nearest valueĢ46-8064000 DCE clock rate (bits per second) The output for above command is shown below.Įnter configuration commands, one per line.
CISCO ROUTER LAB DCE DTE LOOPBACK CABLE SERIAL
To find the possible clock rate values, get the command help by using a question mark after the "clock rate" from the serial interface configuration mode, as shown below. This can be done by using the "clock rate" command, from the interface configuration mode. Since clocking is required to enable the interface, one of the two routers should function as DCE and should provide clocking. If is not marked, we can use the Cisco IOS show command "show controller" command to determine the interface is DTE or DCE. The picture below shows back to back cable. The cable decides which end to be DCE or DTE and it is usually marked on the cable. However, in some cases we might connect two routers back-to-back using the routers’ serial interfaces (Example: Inside the router labs). The router is the DTE (Data Terminal Equipment) and the external device is the DCE (Data Communications Equipment), where the DCE provides the clocking. A CSU/DSU (Channel Service Unit/Data Service Unit) is a digital-interface device used to connect a router to a digital circuit. When connecting a serial cable to the serial interface of the router, clocking is provided by an external device, such as a CSU/DSU device.
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