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- Newsgroups: comp.dcom.cell-relay
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!ames!kronos.arc.nasa.gov!iscnvx!news
- From: myoung@force.ssd.lmsc.lockheed.com
- Subject: Transport Level Again
- Message-ID: <1992Nov18.003449.22162@iscnvx.lmsc.lockheed.com>
- Sender: news@iscnvx.lmsc.lockheed.com (News)
- Reply-To: myoung@force.ssd.lmsc.lockheed.com
- Organization: LMSC, Sunnyvale, California
- Date: Wed, 18 Nov 92 00:34:49 GMT
- Lines: 27
-
- Goings on at the Transport Layer:
-
- Since the path building process allow two objects to use a dedicated
- communications path, (not multiplexing a path with multiple process
- ports), then the capability is enabled for application specific transport
- layers.
-
- For a given application, the developer may design a custom transport
- layer. Two examples are:
-
- 1)
- Phase one: Perform error recovery on a message by message basis, letting
- the state context of each end point determine if a message type is out of
- context. Then phase two: Switch to a sliding window method of error recovery.
-
- 2)
- For some compression schemes, the first message may contain system parameters
- requiring error recovery, but subsequent messages may be excitation vectors
- requiring none.
-
- Each application yields a custom variation on the various transport
- level themes.
-
- By avoiding de-multiplexing the objects have tunneled through the
- standard OS layers. The application specific transport layers imply
- that the adaption layer must make minimal assumptions about the message.
- Computing the checksum, but letting the upper layer decide its relevance.
-