One of my friends adviced me regarding my issue of X21 DTE cable connectivity with MUX, to short pins 3 and 5, and pins 10 and 12 in order to force the CTS up, it worked and serial controller is up on both sides, but the issue is that line protocol is not coming up. The configuration at each router is very simple on their serial interfaces with IP address and encapsulation ppp. I have also confirmed that the two muxes are communicationg well with each other over 64K microwave link. Can anyone plz help out?? Shoaib __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=3027&t=3027 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]