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1.1     ! root        1: % run this through LaTeX with the appropriate wrapper
        !             2: 
        !             3: \section       {Changes to RFC983}\label{changes}
        !             4: The current version, version~2, of the protocol described in this paper
        !             5: incorporates four minor changes to RFC983\cite{TSAP.on.TCP.old}.
        !             6: These are:
        !             7: \begin{itemize}
        !             8: \item  ``Infinite'' length TSDUs are supported\\
        !             9: The original protocol supported transport service data unit (TSDU) lengths
        !            10: of no more than approximately 65K octets.
        !            11: This restriction was removed.
        !            12: From the performance standpoint,
        !            13: it turns out that a TSDU with length on the order of 65K octets (or less) can
        !            14: be handled very efficiently by most implementations.
        !            15: If a user of transport services requires a larger TSDU size,
        !            16: the current protocol will support this,
        !            17: but any implementations of the protocol will most likely do this less
        !            18: efficiently.
        !            19: 
        !            20: \item  More correct use TSAP IDs\\
        !            21: The original protocol mistakenly placed entities other than OSI session
        !            22: on top of the TSAP.
        !            23: This has been corrected.
        !            24: 
        !            25: \item  Negotiation of Expedited Data\\
        !            26: The original protocol mistakenly aborted the connection establishment attempt
        !            27: if there was a mismatch in the proposed use of expedited data.
        !            28: This has been corrected:
        !            29: the use of expedited data is negotiated downwards, as per the ISO specification.
        !            30: 
        !            31: \item  Handling of Expedited Data\\
        !            32: As described earlier,
        !            33: RFC983 tried to manage two TCP connections,
        !            34: one for expedited TSDUs and the second for all other traffic.
        !            35: Although intuitively natural,
        !            36: this method could not guarantee the semantics of the expedited data service
        !            37: in the TP without a complex buffer management scheme.
        !            38: Hence, currently only a single connection is employed.
        !            39: Owing to the properties of the TCP,
        !            40: the expedited data semantics of the TP are handled properly.
        !            41: \end{itemize}
        !            42: 
        !            43: Although all of these changes were rather small,
        !            44: regretably version~2 of the protocol is incompatible with the original
        !            45: protocol found in RFC983.

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