City of Tyler
ITS Master Plan Communication Alternatives There are a variety of methods used for system communications and communications between intersections and a central location. Methods include: • • • • • •
Dial up; Copper wire; Fiber optic cable; Spread spectrum radio; Licensed channel radio; and Cellular networks.
In some cases, the NEMA TS 1 controllers support the more recent communications methods, but the functionality is limited. The TS 2, Type 2070, and ATC controllers support all of the above communication methods. The trend in the industry is towards I.P. Ethernet communications. The system chosen should utilize the highest communication speed available. The chosen system also needs to support signal phasing and timing data (SPaT), high-resolution traffic signal data, and video streaming back to the TMC. Additional information related to communication options can be found in the State of the Practice and Communication Alternative Analysis Memorandum, which are separate technical reports developed under the ITS Master Plan.
Key Considerations The City of Tyler will need to carefully consider their needs for transmitting data and video. Based upon previous discussions, there is a desire to communicate with each ITS device, such as traffic signal controllers, data collection stations, and CCTV cameras. This comprehensive coverage should be carefully designed using the most appropriate technology. For example, it is assumed that a fiber optic cable will continue to provide the backbone of the communications system. The backbone will be complemented using other communication network mediums, such as wireline and/or wireless equipment. Where CCTV cameras are deployed, a medium that supports high-bandwidth should be constructed. The key consideration in constructing a private wireless network is the terrain. The rolling terrain and horizontal curvature of roadways in Tyler will dictate the location, frequency, and height of wireless antennas. This would be considered the lowest cost deployment option to support multiple ITS devices along the roadways and can be deployed over time.
19
