Lots of things are possible. If your carrier supports it, you can run ATM at your host and frame DS1's at your client locations. Terminate the ATM DS3 using an NM-1A-T3 blade for your 3660.
You configure the ATM along the same lines as your would frame relay. The carrier FRATM ( frame relay to ATM ) translation maps all ATM PVC's to Frame DLCI's and visa versa. You can use subinterfaces, or use ATM PVC protocol mapping ( along the lines of frame relay protocol to DLCI mapping ) interface ATM0 no ip address no ip directed-broadcast no atm auto-configuration no atm ilmi-keepalive no atm address-registration no atm ilmi-enable bundle-enable hold-queue 224 in ! interface ATM0.1 point-to-point ip address TO BE PROVIDED no ip directed-broadcast pvc PROVIDED BY TELCO encapsulation aal5snap ! subinterface requires no protocol mapping - just an IP address. If you have an existing HSSI, then you can use an external ATM device such as one of the Kentrox or Marconi products, which can be configured with DS3 ATM in and HSSI out. On the other hand, some of this stuff isn't cheap, so the cost of conversion may no be worth it to you. HTH Chuck -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Patrick Ramsey Sent: Friday, October 05, 2001 8:09 AM To: [EMAIL PROTECTED] Subject: RE: Opinions: ATM or FR for VoIP? [7:21948] Chuck, based on your research, then if a company were to purchase a ds3 for bringign all of the clients into, it would be better to purchase an atm conenction to the provider instead of frame? And bring each ds1 into the atm circuit? What kind of hardware is needed for this to happen? (I say this because the only atm experience I have is fiber based from core to core and from mdf to idf. oc3/oc12 connections) What would I need to look at purchasing? We have a 3660 we are about to migrate a framed ds3 over to. (from 3com)... Is there a blade for the 3660 that allows this? We currently just have a hssi card in it. And what about the edge routers at each facillity? (currently 3com, but will be 2621's) Any light would be nice... I'm interested in learning mroe about this. (of course now that I am done with the email, I guess I'm goign to go tromping around cco. :) -Patrick >>> "Chuck Larrieu" 10/04/01 11:16PM >>> True there is the "cell tax", but my reading indicates that ATM in general is more efficient that frame or T1 even. As much as 905, as opposed to the 60-70% that frame and T1 can claim. more than makes up for the "cell tax" Chuck -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Patrick Ramsey Sent: Thursday, October 04, 2001 8:02 AM To: [EMAIL PROTECTED] Subject: Re: Opinions: ATM or FR for VoIP? [7:21948] hmmm that is interesting... Even with ATM's overhead? Is there that much more reliabillity? (I'm never done voice over either) Is reliabillity the only advantage? And why is it more reliable? Do you mean with packet/cell loss or uptime from the provider? -Patrick >>> "George Murphy CCNP, CCDP" 10/04/01 02:17AM >>> I would go ATM, due to transport architecture and reliability, especially with voice... John Neiberger wrote: > Just a quick opinion poll for those of you who have implemented VoIP. > Given a medium-sized partially-meshed network, would you prefer to use > ATM or Frame Relay for your transport? Assume that most locations would > have DS1 speeds only. > > I ask this because I've been hearing a mixture of opinions. It seems > to me that ATM would allow us to utilize its CoS. With FR you don't > have much control over your traffic beyond FRTS and LLQ. Once it hits > the cloud you're at its mercy. > > However, I haven't heard any details yet but apparently someone at > Cisco thinks that ATM has some scalability problems that FR doesn't > have. I can't imagine what that would be so it will be interesting to > hear what he has to say. I'd be surprised if he suggests FR instead of > ATM. > > Right now, we have a large frame relay network but I'm seriously > considering migrating portions of it to ATM. After hearing these > conflicting opinions I'm really not sure which path to take. > > Any thoughts? > > Thanks, > John Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=22312&t=21948 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
