Dce End Serial Cable

Mustafiz, whether using PT or real routers, when we connect routers like this, its called a serial back to back connection.  Its only done in labs to simulate a WAN its actually a kind of crossover cable. In the real world there would be some kind of intervening device, such as a CSU/DSU.

Its the CABLE itself that determines which end of the link is DCE or DTE.

So, in packet tracer do this: connect two routers using the serial cable that has the little clock icon on it.  You don t need to add IP addresses, just issue the no shutdown command on each serial interface.

Now, on the side that has the little clock icon, run the show controllers command, like this:

Router show controllers s0/0/0 or whatever serial you have

Interface Serial0/0/0

Hardware is PowerQUICC MPC860

DCE V.35, clock rate 2000000

Then run the same command on the other end of the linkwhat do you see.

Last, flip the cable and run the commands again.

Hi Amir,

If both are Down Down, then there should be a layer1 issue. Try tracing the cable to check whether its damaged. Try it in a different port. If still the issue, try replacing with a new one.

Also, to remind you again, check whether its getting up, after giving the command no shut at both interface.

HTH.

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