RE: [UUG/MLUG] GTE ADSL Protocol

["Spurling, Shannon " <EMAIL:PROTECTED>]

DSL is a level 1 protocol. The whole reason that every one is bridging is to
save IP addresses (Layer3), so they are kind of . In theory you could have
some sort of external service device like a PairGain that converts your bits
from the DSL framing/signaling to a serial protocol. Then you would either
have the other end of the DSL line at the central office multiplexed on to a
larger carrier, or plugged in to the Frame Relay switch. That determines
what layer two protocol you would use. Most DSL and cable modem devices are
integrated for cheap production costs and simple user operation. I'm not
even sure if an ADSL (flavor of DSL in use) service unit is available
without having some kind of brouter built in to it. The reason to bridge is
so you can get over the IP overhead of having to assign a /30 (smallest
routable sub-net) and wasting 3 IP addresses in order to give your common
every day user his one IP address. Yes, Cisco routers will bridge in most
cases. You need to be aware that Cisco licensees their router software, and
if you need protocols your router doesn't support, you must pay. With ADSL,
as with all DSL technologies, it's bet to make sure you have the same brand
of device on both ends. Where as the algorithm is probably standard, I don't
think there is a standard protocol with this kind of stuff, unless there is
only one or two people who make the DSP chipsets. I'm not too certain with
ADSL, but HDSL is like that, and I'm thinking ADSL is just a subset.

Thanks 

Shannon Spurling
Programmer/Analyst II

MOREnet, Network Services, Core Network
3212 Le Mone Industrial Blvd.
Columbia, MO 65201

Main:(573) 884-7200   Fax:(573)884-6673

EMAIL:PROTECTED
EMAIL:PROTECTED


-----Original Message-----
From: McNutt, Justin M. [mailto:EMAIL:PROTECTED]
Sent: Thursday, December 02, 1999 7:43 PM
To: EMAIL:PROTECTED
Subject: RE: [UUG/MLUG] GTE ADSL Protocol


Mike is right.  You might still be able to use the Cisco box, but it will
have to function as a bridge, not a router.  The only way you'd be able to
use it as a router would be if GTE gave you your own IP network and either
pointed a static route in your direction or exchanged routing information
with your router via RIP or OSPF.

Since neither of those things is very likely, you're probably going to have
to use it as a bridge.

Which brings us back to your original question:  Assuming that the Cisco box
can bridge instead of route (which it should), does it use a DSL protocol
compatible with what GTE is using?

--J

> -----Original Message-----
> From: Roberts, Michael J. (IATS) [mailto:EMAIL:PROTECTED]
> Sent: Thursday, December 02, 1999 6:11 PM
> To: EMAIL:PROTECTED
> Subject: RE: [UUG/MLUG] GTE ADSL Protocol
> 
> 
> I don't think you would be able to use a router.  The DSL 
> device they gave
> me through Tranquility functioned as a bridge.  I'm not quite 
> sure how GTE
> has it setup, but here's how we do it on campus.  The off 
> campus customer is
> given a DSL device that their ethernet host plugs into.  The 
> other end of
> the device plugs into a DSLAM (Digital Sync Line Access 
> Multiplexor) in some
> GTE node room.  From there we pick up the customer's DLC from a frame
> connection from GTE. The frame is terminated on a sync port 
> on one of our
> Bay routers.  Then it is bridged to another router port where 
> is actually
> get's routed.  If you have a router on your end, you'll 
> probably need a
> dedicated router port on GTE's end.  And I'm not sure GTE 
> would go for that.
> I'm not even sure if the GTE provided DSL device could plug 
> into a router.
> We did something similar to that with PairGain HDSL for on 
> campus customers,
> but we found that it used up to many router ports.  I bet 
> Paul Saab would
> know.  Paul, are you listening?
> 
> -mike
> 
>  
> -----Original Message-----
> From: Gavin Cooper [mailto:EMAIL:PROTECTED]
> Sent: Thursday, December 02, 1999 5:05 PM
> To: EMAIL:PROTECTED
> Subject: [UUG/MLUG] GTE ADSL Protocol
> 
> 
> We're getting ADSL, and would like to use our own router 
> (A Cisco-something ADSL router). My bro read up on 
> ADSL and found that there were two seperate protocols, 
> the names of which slip my mind at the moment, and 
> another information page that said which one GTE used. 
> 
> He just got off the phone with GTE and said that GTE 
> said they used a propriatary protocol for the ADSL, which 
> he thought was BS (either one protocol or the other). 
> Well, does anyone know what protocol GTE uses for their 
> ADSL service?
> 
> Thx
> 
> Gavin Cooper
>