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.
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=47110&t=47101 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
