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- Newsgroups: comp.dcom.cell-relay
- Path: sparky!uunet!cs.utexas.edu!sun-barr!ames!sgi!rigden.wpd.sgi.com!rpw3
- From: rpw3@rigden.wpd.sgi.com (Rob Warnock)
- Subject: Re: Bare Bones Adaptation
- Message-ID: <pb7qjhk@sgi.sgi.com>
- Sender: rpw3@rigden.wpd.sgi.com
- Organization: Silicon Graphics, Inc. Mountain View, CA
- Date: Wed, 2 Sep 1992 08:15:34 GMT
- Lines: 32
-
- young@bantha.decnet.lockheed.com writes:
- +---------------
- | I have a question on the "lean mean" AAL5 adaption layer:
- |
- | Does this definition cover only the begin and end of message
- | indication, leaving the byte count and checksum to be handled
- | by the application specific upper layer?
- +---------------
-
- Not quite. AAL5 includes a 16-bit byte count and CRC-32 in the
- last (marked) cell of each frame, plus enough pad bytes so that
- the count & checksum are always at the end of that last cell
- (so you can find them easily).
-
- +---------------
- | For instance, let's say I am collecting arbitrary uncompressed audio
- | from a continous source. With this application, I really have no checksum
- | requirement, no message boundaries, just collect bytes.
- | Is this the bare bones adaption layer?
- +---------------
-
- You might prefer to use AAL1, I think...
-
-
- -Rob
-
- -----
- Rob Warnock, MS-9U/510 rpw3@sgi.com
- Silicon Graphics, Inc. (415)390-1673
- 2011 N. Shoreline Blvd.
- Mountain View, CA 94043
-
-