[c-nsp] Re: T1 circuits over OC3

[Matthew Crocker]

Actually it will be...


Client Router <WIC-1T1-DSU>  ---<ESF/B8ZS/HDLC> T1 --->   LS 1010 --- 
<ATM CBR PVC T1 CE> ---- OC-3 ---->  Router <ATM PVC SUB-INTERFACE>
[------------- Traditional HDLC  T1 
--------------------------------------]   [------------------- ATM PVC 
-----------------------------------------------------]


The Customer end of the T1 plugs into the LS which terminates a normal 
data T1 (ESF/B8ZS,  HDLC) and passes the traffic over an ATM PVC to the 
Router.  The router would be configured with a sub-interface for each 
T1 to terminate the PVC and provide layer 2 traffic.

On Oct 1, 2004, at 10:41 AM, RH List Account wrote:

> Yup, Jay, you understand my issue perfectly.
>
> But the thing I still don't get is, do you, and if so how do you break 
> out
> the T1 clients?
>
> Client T1 --> LEC --> ATM-OC3 --> LS1010 --> OC3 --> Router
> 						|	  (local)     |
> 						|			  |
> 						\-------- T1 -------/
>
>
> Or
>
> Client T1 --> LEC --> ATM-OC3 --> LS1010 --> 1.5Mbps PVC in OC3 --> 
> Router
>
>
>
> Obviously the latter would preferable, no matter how cheap the T1 
> cards are.
>
> Rob
>
>
> -----Original Message-----
> From: Jay Ford [mailto:jnford at seatpost.its.uiowa.edu] On Behalf Of Jay 
> Ford
> Sent: Friday, October 01, 2004 11:02 AM
> To: Andy Dills
> Cc: cisco-nsp at puck.nether.net; RH List Account
> Subject: Re: [c-nsp] Re: T1 circuits over OC3
>
> On Fri, 1 Oct 2004, Andy Dills wrote:
>> I don't think they wanted to use an ATM T1, as nobody wants the cell 
>> loss
>> on low speed links like that. And few people have that type of CPE
>> equipment laying around.
>
> I'm not talking about ATM on T1.  I'm talking about T1 on ATM.  The CPE
> interface is plain old T1 at both ends.
>
>> See, I thought the requirement was for terminating a traditional 
>> leased
>> line, for instance using HDLC or PPP, but just accepting the T1 over 
>> the
>> ATM.  Similar to a channelized DS3.
>
> Yeah, I wasn't figuring delivering the T1 at the edges via ATM, just 
> over
> ATM
> in the cloud.
>
>> That's L1, I'm talking L2.
>
> The upper layers are whatever you want.  It looks like a real T1 to 
> the gear
> at the edges.
>
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