🚀 go-pugleaf

In article <1992Nov19.174655.1416@cs.tcd.ie>, dherity@cs.tcd.ie (Herity D.) writes:
|> I'm doing an SDLC implementation in software (processing every bit) and
|> am stumped by the CRC calculation.
|> I receive a packet 03h,05h,08h,17h,31h,94h, the last two bytes of which are
|> the CRC. This is in MNP level 5. I've read several versions of how the
|> SDLC CRC is computed, but I can't reproduce it. I've tried CRC-CCITT,
|> CRC-16, LSB first and MSB first, initialising to 0s and 1s, but there's
|> something missing.

I've got a public domain program to do 16 bit CRC's (CCITT) for
HDLC by the table lookup method. It is also in the PPP RFC 1331,
addenums. I can mail the table and some "C" fragments that use it.
It is invertible, getting the magic number 0xf0b8 as a result.
I think I saved my small test program, too. I'll e-mail what I've got
to requestors.

The Internet RFC example is much more readable than my modified
code, and I would advise looking at it if at all possible.

-- 
--------------------------------------------------------------------
       Dave Medin			Phone:	(205) 730-3169 (w)
    SSD--Networking				(205) 837-1174 (h)
    Intergraph Corp.
       M/S GD3004 		Internet: medin@catbyte.b30.ingr.com
  Huntsville, AL 35894		UUCP:  ...uunet!ingr!b30!catbyte!medin

   ******* Everywhere You Look (at least around my office) *******

 * The opinions expressed here are mine (or those of my machine)