North American Network Operators Group
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: Cisco's AIP vs HSSI

  • From: Kent W. England
  • Date: Tue Oct 15 13:59:18 1996 
At 10:58 AM 15-10-96 -0400, Avi Freedman wrote:
>>     This is based on my feeling that HDLC is more efficent
>> 	than ATM signaling/framing.
>
>Agreed...
>But it's not a feeling, it's a fact :)
>
>> --bill
>
>Avi
>
>
>

While this is certainly true, HDLC is a point-to-point protocol
and not a network protocol, like frame relay, SMDS or ATM. And
HDLC itself isn't quite enough, IMHO, you really need PPP.

And the efficiency lost to ATM is not 40% as often claimed on this
list, but rather it is 12% less efficient than PPP for TCP. 
10% is the cell header overhead and 2% is due to modulo 48 padding, 
given actual traffic at FIX West as measured by kc at NLANR.

--Kent

We return to our regularly scheduled ATM tweaking program now in 
progress.
:-)

- - - - - - - - - - - - - - - - -