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                      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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