Red Light Camera System
Application: Network-Enabled Red Light Camera System
Quatech Products Used: QSE-400D
and DSE-400D 4 and 2-Port
RS-232/422/485 Device Servers
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Streamlining legacy traffic management systems can be significantly simplified
using device server technology. As in the example above, a traditional
red light camera system consisted of pairs of traffic lights and cameras,
each of which was controlled by a remote server. However, Traffic Management
Centers often used multiple proprietary applications to run these systems
making them incompatible with other agency systems, and completely inaccessible
to other jurisdictions. Using device servers to network-enable the traffic
light controllers and Pan-Tilt-Zoom controllers on the cameras enables
the system to comply with NTCIP requirements that the devices be available
to all authorized jurisdictions. With device servers, the remote serial
equipment can be network-enabled using the fiber LAN network already in
place along most major roadways, as shown in the above diagram.
Device servers offer the additional versatility of being invisible to
software applications. Thus they are compatible with all serial-based
traffic controllers and associated proprietary software protocols, because
they function simply as pass-through devices. The device server does not
interpret proprietary signals, it simply encapsulates any RS-232/422/485
serial signal in TCP/IP, transports it over Ethernet, the strips away
the TCP/IP information, leaving the PC or server to interpret the serial
data using any supported language or protocols. This means a single
device server can be used with any combination of equipment using any
number of different protocols. The devices can then be accessed by
any authorized PC or server on the network, regardless of operating system,
just as if it were directly attached to a local COM port. And, while only
one computer at a time can access a particular port, multiple computers
running different operating systems can access different ports on the
device server simultaneously or can be programmed to poll the devices
at predetermined intervals.
Quatech device servers are uniquely well suited for red light camera
systems because they offer the industry's lowest latency. Particularly
in heavy traffic locations, traffic controller software and PTZ control
software is constantly polling the equipment. Quatech's high performance
device servers in ultra low latency mode offer the speed and reliability
required to keep systems functioning flawlessly.
Other Intelligent Transportation Systems Applications:
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