Hi,
My limited understanding of the technology tells me that we have something like a
telnet session in IP. The telnet application is associated with a socket (port) 23
this goes down the protocol stack and attaches and IP address. Assuming ethernet the
packet as it is now goes on down the stack and picks up a MAC address and a framing
type. This heads on down to the interface where the electical stuff happens. Once
on the wire the electrcal pulses are picked up by the relevant device.
When leaving the ethernet one might use a router. This picks up the pulses and
basically does the reverse of the above. Identifies the address (IP address) finds
the appropriate port as assigns the new framing type and address for the next point.
Back down the stack to the interface where the appropriate electrical stuff happens.
Along to the remote end and the reverse occurs.
This going up and down the appropriate protocol stack happens at each point along the
way.
In otherwords T1, Frame Relay, ISDN, Serial Asynch modems whatever do not really know
nor do they care about the IP layer 3 stuff. In routed type protocols they only care
about there own layer 3 and can only understand their own layer 3. Therefore IPX
cannot directly talk to IP at the network level. At the layer 2 who cares the data
will pass through as long as it has the appropriate frame types. IPX and IP can live
happily afterall the layer 3 and above is wrapped up in the appropriate frame. At
layer 1 if the elctrical suff all agrees we can send the different frame types
afterall it is only electrical pulses but the two ends must agree electrically
including timers etc.
Long winded but to me it is a simple shuffle of stuff down a protocol stack to the
wire -> next device up the stack and so on.
Teunis,
Hobart Tasmania
Australia
On Wednesday, February 07, 2001 at 06:36:34 PM, Santosh Koshy wrote:
> Pardon my ignorance here....
> Is there such a thing as just a "T1 Link"...
>
> of what I understand T1 / Frac T1 resides in the physical layer.... Dont u
> need something at the Data Link Layer (such as Frame Relay) before you can
> enable IP or IPX at layer 3....
>
>
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