SIXTY-YEARS

of Radio System Design Experience

1960's

Our first customer CALTRANS ask CTI to develop an AM Rebroadcast System for the Caldecott Tunnel in Oakland, California, CTI successfully delivered the first AM tunnel rebroadcast system in 1962. CTI designed and built; the tunnel distributed antenna system (DAS) used an AM antenna that created AM field in the highway providing coverage throughout the tunnel. CTI Mark-I AM rebroadcast system added emergency break in to substitute over the air signals with emergency messaging by CALTRANS tunnel operations.

1970's

CTI designed an FM Radio Rebroadcast System for CALTRANS, using a FM twin lead antenna system that CTI designed and built, along with a CTI Mark-II FM rebroadcast system added emergency break in to substitute over the air signals with emergency messaging over both the AM and FM bands.

1980's

CTI designed and built VHF twin lead antenna system, along with a CTI Mark-III VHF Two-way Rebroadcast System, to deliver CALTRANS operations channels.

1990's

CTI designed and built a UHF twin lead antenna system, along with a CTI Mark-III UHF Two-way Rebroadcast System, to delivery fire department communications.

2000's

CTI designed and built a Mark-IV 800 MHz Rebroadcast System, and the Mark-IV 800 MHz Channelized Repeater Amplifier (CRA), which used both leaky coax and free space antenna DAS to deliver public safety communications.

2010's

In 2010’s CTI designed and integrated a 700 MHz Rebroadcast System, and the Mark-IV 700 MHz CRA. Most recently CTI has developed a Network Management System (NMS) for CALTRANS to control CTI Rebroadcast Systems in the Caldecott, Posey, Webster, Doyle Drive, Presidio and Devils Slide Tunnels. Caldecott is a microcosm of CTI’s long history of providing increasingly sophisticated RF system designs and CTI’s unique background as a designer, an integrator and a RF equipment manufacturer. CTI has provided design solutions for highway tunnels systems in Asia, Europe, South America and across the US.

Today

LA Metro Regional Corridor Connector “Simplicity through Complexity” The LA Metro (METRO) Regional Corridor Connector is METRO’s most complex Radio System. The Regional Corridor will bring the most diverse rail lines, the highest volume of trains in the shortest headways in the METRO system. The radio system will add in the most channels and require the most redundancy, both add complexity to the design. CTI is the Engineer of Record (EOR) for the Regional Corridor Connector, working for the Prime Contract on this design build project.


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Today

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LA Metro Regional Corridor Connector “Simplicity through Complexity”

The LA Metro (METRO) Regional Corridor Connector is METRO’s most complex Radio System. The Regional Corridor will bring the most diverse rail lines, the highest volume of trains in the shortest headways in the METRO system. The radio system will add in the most channels and require the most redundancy, both add complexity to the design. CTI is the Engineer of Record (EOR) for the Regional Corridor Connector, working for the Prime Contract on this design build project.
CTI designed a dual headend system with geographic, headend and equipment N+N redundancy. CTI’s Network Management System (NMS) is designed to provide control and monitoring, the NMS allows for instantaneous main to back up switching of the head-ends, redundant equipment and fiber paths in the system. The NMS monitoring and adjustment of the equipment at the individual hardware level, allows operations and maintenance personnel to assess and address maintenance issues before dispatching field resources.
The complexity of the design allows for simplicity of operations and maintenance, major alarms can be addressed through redundancy and issues can be evaluated online and resources can be assigned to address now minor issues that no longer effect system operations. CTI has been working with METRO since 90’s, completed design and integration projects in METRO’s Red, Blue, Green and Yellow lines and as part of the Regional Corridor project will oversee the second retrofit of the 7th/Metro hub, the first retrofit was in 1999.