363-206-285
Applications
2-64 Issue 3 June 2001
Intelligent Vehicle Highway System (IVHS)
Applications 2
IVHSs are beginning and will grow to play a major role in the roadway systems of
the future. Their primary use in the near-term is to reduce congestion. This is done
in several ways.
â– The IVHS provides more efficient and optimal traffic management which
attempts to avoid congestion in the first place.
â– The IHVS provides better management of congestion caused by random
occurrences such as accidents or breakdowns.
â– The IVHS eliminates many of the foreseeable causes of congestion, such
as toll-taking, by automating these functions.
In the future, these systems will also help travelers plan their routes by providing
up-to-the-minute traffic and highway information. The DDM-2000 OC-3 and
OC-12 Multiplexers are a perfect match for the networking needs of these
systems.
Figure 2-44 shows a typical IVHS application. An IVHS network calls for carrying
data between roadside equipment, such as traffic counters, speed sensors,
variable messaging signs, video cameras, toll-taking equipment, pay phones and
call boxes, and a traffic operations center, where incoming data is processed and
responses are generated. The DDM-2000 OC-3 and OC-12 Multiplexers provide
a perfect backbone for carrying this information. The DDM-2000 OC-3 Multiplexer
SONET ring capability, when coupled with diverse fiber routing on opposite sides
of the roadway, makes the backbone completely self-healing in the face of
failures. Such reliability is absolutely essential, especially as travelers come to
depend more and more on IVHS networks. The VT1.5 and STS-1 bandwidth
management capabilities of the DDM-2000 OC-3 and OC-12 Multiplexers allow
flexible allocation of bandwidth to match the dynamics of a roadway system which
is undergoing unpredictable changes in traffic patterns, breakdowns, accidents,
and repairs. Such bandwidth management provides a system which meets the
IVHS network needs in a cost-effective manner. DDM-2000 OC-3 and OC-12
Multiplexers completely meet the transmission needs of an IVHS network.
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