would somebody just change some settings on an external CSU/DSU and report the results? Who cares if it's a production network? It's getting towards midnight, it'll only take a couple of minutes, and the suits are all asleep! ;->
""John Neiberger"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > This isn't quite true. For example, a DCE router interface will be > down/down if DTR is not raised by the DTE device. I see this quite > often at work and faulty cabling is generally not the culprit. It's > almost always bad hardware in the DTE. > > John > > Michael L. Williams wrote: > > According to CCIE exam materials, the *only* time the serial will show > > down/down is when there is NO serial cable or a bad serial cable connected. > > So even if you have a misconfigured framing method, you should at least see > > up/down..... > > > > Mike W. > > > > "Bob Timmons" wrote in message > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > >>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=47122&t=47101 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
