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.
■ The IVHS provides more efficient and optimal traffic management which
attempts to avoid congestion in the first place.
■ The IHVS provides better management of congestion caused by random
occurrences such as accidents or breakdowns.
■ 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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