At 11:11 PM -0400 6/20/02, Bob Timmons wrote: >I can't say I've ever seen a down/up condition. Up/Down perhaps. > >I'm sure there are exceptions, but it's my belief that the router doesn't >care about encoding, but rather a layer-1 connection to the dce/dte device. >If the router can 'talk' to the device on the other end of the cable, you >should get an up/x condition, where x would depend on the csu/dsu condition >of the line.
This is an interesting discussion. I think of encoding and framing as both being different sublayers of layer 1. > >I don't have a csu handy, otherwise I'd check that right now. I can do that >tomorrow morning (10:30 pm est here), but you may have an answer prior to >that... > > >> Hi Priscilla, >> >> I have actually had this scenario (multiple times), but due to the Telco's >> misconfiguration. >> Specifically we were expecting b8zs/esf. Unfortunately I can't confirm >> which was configured incorrectly, but I can confirm that going through >> all of the different combinations available at the router you will >> get all combinations on the serial interface (up/up, down/up and >down/down). >> >> I can also confirm, you will not establish connectivity, regardless. I >> believe >> either b8zs/esf or sf/ami are the only valid combinations. At least that >is >> all I've >> ever worked with. >> >> Hope this helps, >> -TV >> >> >> ""Priscilla Oppenheimer"" wrote in message >> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... >> > Hi Group Study, >> > >> > While writing some questions for a practice test, I found myself >> > questioning what I thought was the right answer. Here's the scenario: >> > >> > A Cisco router serial interface is correctly connected with a good V.35 >> > cable to the data port on the DSU side of a CSU/DSU. The CSU/DSU has >been >> > misconfigured for the framing method (SF instead of ESF). The framing >> > doesn't match what the provider is using. (The question refers to a >> CSU/DSU >> > that is external to the router, not one that is built into the router.) >> > >> > Will the Cisco router serial interface be down/down or up/down? >> > >> > And, would the answer be any different if the question has to do with >> > misconfiguring the encoding (AMI versus B8ZS)? >> > >> > If you have real-world experience with this, that would help. I have >read >> > the Cisco documentation and the troubleshooting charts, etc. >> > >> > Thanks >> > >> > Priscilla >> > >> > ________________________ >> > >> > Priscilla Oppenheimer >> > http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47113&t=47101 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
