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Re: UTOPIA

  • From: James Carlson <carlson@ironbridgenetworks.com>
  • Date: 14 Jan 2000 21:15:45 -0500
  • X-Complaints-To: abuse@rcn.com


Paul Koning <pkoning@lucent.com> writes:
> You mean Packet over Sonet?  In spite of what the title of
> the RFC says, that protocol is more closely related to
> BISYNC than to HDLC.  After all, BISYNC is the only other
> byte-stuffing protocol around; HDLC is BIT-stuffing.

You may want to haul out a copy of ISO/IEC 3309 (HDLC) and have a look
at section 4.5.2.  The protocol used by PPP (aka "POS") on SONET/SDH
is exactly HDLC framing.  (Yes, 4.5.2 is intended for start/stop
transmission, and PPP does use it oddly here, but it's still HDLC
framing.)

-- 
James Carlson, System Architect                     <carlson@ibnets.com>
IronBridge Networks / 55 Hayden Avenue   71.246W   Vox:  +1 781 372 8132
Lexington MA  02421-7996 / USA           42.423N   Fax:  +1 781 372 8090
"PPP Design and Debugging" --- http://people.ne.mediaone.net/carlson/ppp

  • References:
    • UTOPIA
      • From: "Michael McGarry" <mmcgarry@speakeasy.org>
    • Re: UTOPIA
      • From: Baris Aksoy <baris.aksoy@gte.net>
    • Re: UTOPIA
      • From: "Tim Dwight" <tdwight@fore.com>
    • Re: UTOPIA
      • From: Paul Koning <pkoning@lucent.com>