I have seen moe than once a faulty WIC-1DSU-T1 cause similiar problems. Have you tried doing your own hardwire loop?
Dave James Gosnold wrote: > Dear all, > > I have something of a problem I hoped someone might offer some advice on. > > We have a 1721 router at each end of a 128k leased line. The line went down > this morning, red alarm light on the CSU, router showed as Serial Interface > Up, Line protocol down. Ok fair enough, reported the fault, telco claimed to > repair the fault. > > Alarm light on CSU is no longer red but 'show interface serial0' still shows > Interface Up, Line protocol down. I've power-cycled the routers with no joy. > Engineers from the telco have actually come on site and performed an end to > end test and are telling me it's fine. > > Looking at the advice offered here by Cisco: > http://www.cisco.com/en/US/products/hw/routers/ps221/products_configuration_guide_chapter09186a008007cd3d.html#xtocid8 they tell me that the problem could be: The local or remote router, a problem with the leased line or a problem with the CSU/DSU. Great thanks, that's helpful!! > > Can anybody offer any suggestions on what might have gone wrong? It seems > strange to me that a pair of routers that worked perfectly fine for 8 months > have developed a fault at exactly the same time as the leased line did? How > can I prove to the telco that it is their problem? > > The config of these routers is really simple by the way, 1 x Ethernet > Interface, 1 x Serial (WIC) interface, static route, encapsulation ppp, no > chap/pap, that's about it! > > Thanks, James. -- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367 "Government can do something for the people only in proportion as it can do something to the people." -- Thomas Jefferson Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=69590&t=69573 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
