Yes, these cables have different pinouts. Take a look at the following link:
http://www.cisco.com/warp/public/779/smbiz/service/knowledge/pinouts/ If that link doesn't get filtered by the list filters then you'll be able to see the differences. As far as connecting two routers using two V.35 cables, if one is male and the other is female then you probably have a DCE and a DTE cable. The router that you connect the DCE cable to will have to be configured to provide clocking. You cannot configure a clockrate on the DTE side. I don't know how familiar you are with ethernet cabling but you can relate this to straight-thru and crossover ethernet cables. When you directly connect two PCs or routers without a hub or switch then you have to use a crossover cable. The transmit side of one device has to match up with the receive side on the other and vice versa. This is why there are DCE and DTE versions of serial cables. If you're connecting two routers directly together you must use a crossover serial cable so that the transmit and receive pins all match up correctly. HTH, John >>> "Sam Deckert" 10/25/01 7:21:13 AM >>> Thanks Tim, that was great! So, a special db60-db60 cable can be used for back-to-back connections, and will work as long as one router is set to be the DCE and provide a clockrate. Does this cable have any special pinouts or anything? Is there a diagram somewhere? Did a search on google, no luck tho! Also, would a setup with two V.35 cables (one male, one female) connected together between two routers work in the same way? Thanks for your help! Sam. ----- Original Message ----- From: "Ouellette, Tim" To: Sent: Thursday, October 25, 2001 9:49 PM Subject: RE: DTE/DCE explanation please [7:24071] > Sam, > > "the whole DTE/DCE" thing is related directly to where the clocking comes > from. In a "typical" wan, the clocking to your router's serial port comes > from an external CSU/DSU that your carrier may provide. Therefor, the > carried is the DCE and your router is the DTE. In a home environment, if > you have your routers connected via a db60->db60 cable, one of those routers > needs to supply the clock rate. Check your cable because one end is > probably labelled as DCE and the other DTE. If it's not, trying using the > "show controller serial x" and that should tell you the type that is plugged > into it. On the DCE side of that connected link, you need to use the "clock > rate" command to supply clocking to the other side. > > I don't think there is a "DTE cable" I believe it's more of you order the > proper pin size (db60 on 2500's and db60 or db50 on the 4000's) for each > side. > > Hope that helps. > > Tim > > > -----Original Message----- > > From: Sam Deckert [SMTP:[EMAIL PROTECTED]] > > Sent: Wednesday, October 24, 2001 10:54 PM > > To: [EMAIL PROTECTED] > > Subject: DTE/DCE explanation please [7:24071] > > > > Hello, > > > > Could someone kindly explain the whole DTE / DCE thing in relation to > > setting > > up a home lab and using routers back to back? > > > > I believe that DTE is male and DCE female, but what are the other > > differences? > > > > When connecting a router to a CSU/DSU, would you always order a DTE cable? > > > > Thanks for any help anyone can provide! Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=24102&t=24071 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
