Mark, Saying that THE problem is one thing or another is always dangerous (and, frankly, a little unprofessional). I should have said that A problem is that you didn't have a clock source on the line. You need at least one. Two doesn't hurt either (both can be internal). There may well be other issues. As others have pointed out, framing and coding need to match. According to your posts they do. As for attenuation, DS3s are VERY sensitive. I don’t have the specs here at home but can say with experience that even a few tenths of a volt high or low can cause errors. Hopefully you’re using good 75 ohm DS3 coax (AT&T 735 series or equivalent). Also, with Cisco routers, I’ve seen plenty of instances where a 75 ohm terminator was necessary at the receiving (and in some cases transmitting) interface. You may have to put a “T” in with the stem of the “T” on the interface, the cable on one part of the “top” of the “T,” and the terminator on the other end. Are these routers back to back?
That changing the clock scheme made such a negative change probably tells us something. I've been out working on an electric fence all day (and battling dehydration by way of drinking dehydrating liquids with "Lite" in the name) so I'm probably not much help tonight. I'll give it some thought but will be flying most of tomorrow. Hopefully you'll make good progress in the mean time. Please keep us posted… Regards, Scott Mark Walmsley wrote: > > Hi Again Everyone, > > Just to let you all know, this morning I changed the 7200 > router serial interface clock to int and left the 7500 clock > set to line, this actually made the connection worse, I got 5% > packet loss as opposed to 1% packet loss when both router > interfaces were set to line, I changed it back and it returned > to 1% packet loss so then I changed the 7500 interface clock to > int while the 7200 was set to line and this appeared to have > little affect, still getting lots of input errors on the 7200 > and 1% packet loss. > I'm wondering now if we have a faulty ds3 card. > > I logged into the routers and did some ping tests, pinging the > routers own serial interface I still get the 1% packet loss. I > did this on both routers, I thought this might rule out the > actual line because I'm not pinging across the ds3 connection > please correct me if i'm wrong. > > Somebody asked if scrambling was on but I'm not sure what > scrambling does or how to check if it's turned on or off so > i'll look into that too. > > > Thanks for everybody's help and I'm going to spend all day > checking out what you've said and going through the > troubleshooting stuff from cisco and i'll let you know how I > get on. > > Anymore advice would be greatly appreciated. > > Mark Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=65566&t=65491 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
