As revised 2006.05.04
Bionic Buffalo Tech Note #55
many data structures (such as taps, compatiblity descriptors, and resource descriptors) allow
implementation specific use subject to some syntactical constraints
various types and tags include userassigned values, or allow new values to registered by
The UU or RPC protocol provides mechanisms defined by the underlying protocol (typically GIOP). In
addition, the additional data structures (such as taps, compatibility descriptors, and resource descriptors),
most of which are shared with elements of the UN protocols, offer the same extensibility mechanisms
available to UN protocol implementors.
It should be noted that the extensibility mechanisms can severely hinder interoperability. For example,
the version of UN used by Scientific Atlanta and interoperable vendors make such heavy use of private
data instead of using the specification defined mechanisms, that their implementation is for all intents
and purposes a proprietary protocol; and their UU protocol, although it has some aspects of DSMCC
UU, is almost unrecognizable in terms of the specification.
Bibliography and References
ISO/IEC 138186, Information Technology Generic coding of moving pictures and associated audio
information Part 6: Extensions for DSMCC, 1998.09.01
OMG formal/021101, CORBA Core Specification 3.0, 2002.11
Publisher's Information and Notes
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Copyright 2006 Bionic Buffalo. All rights reserved.
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