363-206-295
Applications
2-38
Issue 1
December 1997
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 2-24 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.
