Re: CSU/DSU question
For data over T-1, you should use ESF/B8ZS, not SF/AMI. Assuming this is a clear channel T-1, the datalink protocol is up to you. If you have Cisco routers on each side, either HDLC or PPP would be good choices. If any of the routers are not Cisco, use PPP. Have you configured your serial controller correctly, making sure it is using the correct timeslots? Perhaps you should post the relevant portions of your config so we can troubleshoot further. Regards, John > > I have an old csu/dsu (rad fcd 1 ) conected to a 7500 router. we use this > T1 to enable two of our sites to communicate point to point (all is working > at the moment). However I am trying to implement that same connection with a > 2610 with a built in csu/dsu. Originally I configure the Controller on the > 2610 to use ESF framing , B8ZS and PPP encapsulation. This router was in > operation before , being used as an Internet router > so I know the HW is good. Hower when i connected the 2610 with the new > config (wiped out old onfig when used for internet) to the TI (provided by > PAC BELL) being use on the 7500 I got some weird results. > serial x (reset) , line prot down > > Then I changed the encapsultion to HDLC ,that got rid of the reset , and > changed the framing to SF . When I changed to framing , i got se up, line > prot up , then few seconds later i did a sh int and saw the up , down. > I tested my controller to make sure HW is ok by connecting it to one of the > T1'S providing internet access. It worked fine , off course I had to change > to esf, b8zs and ppp. > > Is it the telco who prvides us what we should use as framing, linecode and > encapsulation? or does it depend on the csu/dsu being used. ??? > > > > Mo Durrani > IS&T > WYSE\EDS > phone:408-473 1246 > [EMAIL PROTECTED] > [EMAIL PROTECTED] > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Find the best deals on the web at AltaVista Shopping! http://www.shopping.altavista.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: CSU/DSU question
Telco dictates the circuits parameters.. The encapsulation however for a T1 can be decided by you... unless it is frame-relay or X.25 or some type of data link layer communications needs to happen to telco's switches. The normal settings these days is ESF / B8ZS for a T1. When you changed the framing to SF the line and protocol would go to up until the router realized it wasn't seeing the "keepalives" from the switch then it would switch it to down. If this is a new installation of the T1 you might want to make sure the T1 is turned up... I'm not positive what turned up means but I think its just telco's way of not activating the circuit until you call them and tell them your ready to be billed for it. Cory -Original Message- From: Moahzam Durrani [mailto:[EMAIL PROTECTED]] Sent: Friday, February 09, 2001 1:10 PM To: [EMAIL PROTECTED] Subject: CSU/DSU question I have an old csu/dsu (rad fcd 1 ) conected to a 7500 router. we use this T1 to enable two of our sites to communicate point to point (all is working at the moment). However I am trying to implement that same connection with a 2610 with a built in csu/dsu. Originally I configure the Controller on the 2610 to use ESF framing , B8ZS and PPP encapsulation. This router was in operation before , being used as an Internet router so I know the HW is good. Hower when i connected the 2610 with the new config (wiped out old onfig when used for internet) to the TI (provided by PAC BELL) being use on the 7500 I got some weird results. serial x (reset) , line prot down Then I changed the encapsultion to HDLC ,that got rid of the reset , and changed the framing to SF . When I changed to framing , i got se up, line prot up , then few seconds later i did a sh int and saw the up , down. I tested my controller to make sure HW is ok by connecting it to one of the T1'S providing internet access. It worked fine , off course I had to change to esf, b8zs and ppp. Is it the telco who prvides us what we should use as framing, linecode and encapsulation? or does it depend on the csu/dsu being used. ??? Mo Durrani IS&T WYSE\EDS phone:408-473 1246 [EMAIL PROTECTED] [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: CSU/DSU question
> Is it the telco who prvides us what we should use as framing, linecode and > encapsulation? or does it depend on the csu/dsu being used. ??? Telco configures the line for the proper coding. ESF/B8ZS is the most common, however SF/AMI is still around. A local carrier here normally provisions their lines (across town for example) for SF/AMI unless the customer requests otherwise. PPP vs. HDLC refers to the line encapsulation, or what the routers use to communicate. This is independent of the line coding (ESF/B8ZS). If you are talking Cisco to Cisco equipment use HDLC.If you are talking Cisco to something else, PPP is the way to go since Cisco's HDLC is a proprietary implementation. (PPP is common when talking to ISP's. Even if they have Cisco gear because it makes PPP their standard). Ed _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
