[47] in resnet
Re: How to join a net through NET
daemon@ATHENA.MIT.EDU (Derek Atkins)
Thu May 27 18:40:06 1993
To: akajerry@watson.ibm.com (Jerry Larivee)
Cc: warlord@GZA.COM, resnet@MIT.EDU, ninjo@MIT.EDU, jh@flolab.mit.edu
In-Reply-To: Your message of "Thu, 27 May 1993 18:35:03 EDT."
Date: Thu, 27 May 1993 18:38:17 -0400
From: Derek Atkins <warlord@GZA.COM>
> And yes the phone company does switch a few bits underneath
> you. They use those bits for synconization. I've never heard it
> mentioned as a problem for digital communication, either they do
> something different for digital communication (similar to what they do
> for modems) or they just rely on the fact that any digital
> communication system can handle a few bad packets every so often.
This is correct. They switch the low bit every six packets or so for
the HDLC encoding, or something like that (I'd have to go look at my
6.263 notes again). Basically, you can safely get 56 Kbps through a B
channel by ignoring the LSB of each byte.
-derek
