Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

noise stats on 2511 ports

Can anyone tell me what exactly the noise stats relate to when i run show line on a 2511 as on some ports the value is increasing all the time - is this due to attenuation on the cabling? Any ideas would be appreciated. Thanks

4 REPLIES
Hall of Fame Super Silver

Re: noise stats on 2511 ports

Ross

I believe that when the 2511 gets any electrical signal on those async lines which it can not process as valid communications signal it counts as noise. If something is connected and passes along any static or has a faulty connector, or anything like that it can cause increasing counters for noise.

HTH

Rick

New Member

Re: noise stats on 2511 ports

Thanks for the info - I thought that this would be the case - do you think installing STP cabling or something like that would help? As i suspect that if the noise gets to high then it would start to clog the buffer and cause the router to crash. Cheers.

Hall of Fame Super Silver

Re: noise stats on 2511 ports

Ross

Good quality cable and good quality connectors may help.

I have never seen a situation where we had a router crash because the noise counter got too high.

Would I assume that you are using the 2511 as a terminal server and doing reverse telnet on the async ports? If so do you have no exec configured on the async lines? That could be helpful.

HTH

Rick

New Member

Re: noise stats on 2511 ports

Hi Rick - yes we have the exact config you refer to - I think I will change the cable type to STP/FTP to see if that helps. I will post the results on here when I have them if you are still interested. Thanks mate.

Ross

130
Views
0
Helpful
4
Replies
CreatePlease login to create content