[5334] in North American Network Operators' Group
Re: Cisco's AIP vs HSSI
daemon@ATHENA.MIT.EDU (Kent W. England)
Tue Oct 15 13:20:52 1996
Date: Tue, 15 Oct 1996 10:06:17 -0700
To: Avi Freedman <freedman@netaxs.com>
From: "Kent W. England" <kwe@6SigmaNets.com>
Cc: bmanning@isi.edu (Bill Manning), nanog@merit.edu
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.
:-)
