Cisco only do 3m cables for serial interface to DCE/DTE.
Ive seen some X21 extension cables that would allow us a longer distance between our router and X21 interface. Has anyone used these and are we likely to see any problems if we use them. ( if anyone knows of any single cable solution Id really like to hear about that as well but I havent been able to find one. )
We need an overall distance of about 10m and the line will be an E1 (2Mb)
We have done that extensively and run into a number of problems.
These problems were analyzed by our local carrier.
Since the clocking is only generated by the DCE, it tracels with a delay to the DTE. There the delayed clock is used for the TX data which travels back to the DCE. So the TX data arrives at the DCE with twice the delay time.
But the DCE compares this delayed TX against its own undelayed clock.
If the timing is wrong you run into problems.
At 2mb the crucial length is between 11m-17m. It also depends on the cable,
the chips ... you could get problems earlier and at lower speeds.
We usually try to reduce the length, once i succeded in increasing the length.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.