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=7i=24089t=24071 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DTE/DCE explanation please [7:24071]
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=7i=24093t=24071 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DTE/DCE explanation please [7:24071]
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=7i=24102t=24071 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DTE/DCE explanation please [7:24071]
Cisco sells DCE and DTE cables and some of the routers are s smart they know if they are conneced to one or the other, i.e. you cant set the clock rate if you have a DTE cable conected: C3640B(config)#inter ser 1/0 C3640B(config-if)#clock rate 154000 %Error: This command applies only to DCE interfaces On the above example are two V.35 cable connected b-b and I attempted to set the clockrate on the DTE. Dave Sam Deckert wrote: 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! -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=24105t=24071 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DTE/DCE explanation please [7:24071]
Welcome. I use the db60-db60 in my home lab to connect my 2500's. Check on ebay, they go for about 20 bucks. Check out the following link for pinouts, you can make your own but the pins are darn small (take my word on it) http://www.cisco.com/warp/public/779/smbiz/service/knowledge/pinouts/ Watch the wrap, if any. with the v.35 cables, one end would be dce and the other dte. Just be carefull which end is which. db60--V.35 | V.35 db60 | | | | DTE DCE DCE DTE If that's what your refereing to then I don't think it'll work due to both far ends being DTE's. Lemme know if you have any more questions. I had to discover this stuff out the hardware way so maybe I can advise a little more. Tim -Original Message- From: Sam Deckert [SMTP:[EMAIL PROTECTED]] Sent: Thursday, October 25, 2001 9:23 AM To: Ouellette, Tim Cc: [EMAIL PROTECTED] Subject: Re: DTE/DCE explanation please [7:24071] 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=7i=24096t=24071 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: DTE/DCE explanation please [7:24071]
that started with the 12.x releases, I believe. in 11.x one could enter the clockrate on a DTE interface, but the command would not show up in the running config. Later, if one were to plug a DCE cable into that interface, the clock rate command magically appeared! Cisco seems to be taking the real fun out of the IOS with the 12.x releases.. :- 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! -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=24112t=24071 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DTE/DCE explanation please [7:24071]
Another handy dandy command to see whats connected is: 3660A#sh controller ser 3/3 M4T: show controller: PAS unit 3, subunit 3, f/w version 1-45, rev ID 0x281, version 2 idb = 0x621ECF4C, ds = 0x621EEC04, ssb=0x621EEEDC Clock mux=0x0, ucmd_ctrl=0x0, port_status=0xC Serial config=0x8, line config=0x200 maxdgram=1608, bufpool=48Kb, 31 particles DCD=down DSR=down DTR=down RTS=down CTS=down line state: down cable type : V.35 DCE cable, received clockrate 246 base0 registers=0x3D80, base1 registers=0x3D802000 mxt_ds=0x62638504, rx ring entries=40, tx ring entries=128 rxring=0x56ABB80, rxr shadow=0x621F4C88, rx_head=0 txring=0x56ABD00, txr shadow=0x621F4E94, tx_head=0, tx_tail=0, tx_count=0 throttled=0, enabled=0 rx_no_eop_err=0, rx_no_stp_err=0, rx_no_eop_stp_err=0 rx_no_buf=0, rx_soft_overrun_err=0, dump_err= 0, bogus=0, mxt_flags=0x20 tx_underrun_err=0, tx_soft_underrun_err=0, tx_limited=1(2) tx_fullring=0, tx_started=0 I have a DCE on this interface. Dave Chuck Larrieu wrote: that started with the 12.x releases, I believe. in 11.x one could enter the clockrate on a DTE interface, but the command would not show up in the running config. Later, if one were to plug a DCE cable into that interface, the clock rate command magically appeared! Cisco seems to be taking the real fun out of the IOS with the 12.x releases.. :- Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of MADMAN Sent: Thursday, October 25, 2001 7:23 AM To: [EMAIL PROTECTED] Subject: Re: DTE/DCE explanation please [7:24071] Cisco sells DCE and DTE cables and some of the routers are s smart they know if they are conneced to one or the other, i.e. you cant set the clock rate if you have a DTE cable conected: C3640B(config)#inter ser 1/0 C3640B(config-if)#clock rate 154000 %Error: This command applies only to DCE interfaces On the above example are two V.35 cable connected b-b and I attempted to set the clockrate on the DTE. Dave Sam Deckert wrote: 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! -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=24118t=24071 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DTE/DCE explanation please [7:24071]
Thanks Drew, John and Tim! That has been great. Sorry for the simple questions, but I have not had access to a lab before, and have just got a new job where I will have, so I am trying to increase my conceptual knowledge to more physical hands-on knowledge. I am really looking forward to getting to have a play (in a non-production environment!) without the threat of bringing anything important down. The routers I have worked with in my previous job pretty much involved telnet and that was it. Thanks heaps again! - Original Message - From: Drew - Home To: Sam Deckert Sent: Friday, October 26, 2001 3:28 AM Subject: Re: DTE/DCE explanation please [7:24071] 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. Correct. Does this cable have any special pinouts or anything? It is DCE on one end and DTE on the other. Is there a diagram somewhere? Did a search on google, no luck tho! Maybe on the Cisco page? Also, would a setup with two V.35 cables (one male, one female) connected together between two routers work in the same way? You can connect one DCE cable to one DTE cable for the same effect. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=24166t=24071 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
