(XX expressway communication system is mainly composed of optical fiber digital transmission system and integrated service access system, program-controlled digital switching system, dedicated communication power supply system, roadside emergency telephone system, mobile communication (dispatching) system, video transmission equipment and indoor and outdoor optical cables. Integrated Communication System (ICS) composed of transmission medium. The optical transmission system adopts the integrated service access network mode integrating built-in SDH digital transmission equipment and optical fiber user access equipment. The integrated service access network is used to access and transmit user information, and the transmission signal adopts STM-1 signal (rate 155Mbit/s). The entire optical transmission system can provide comprehensive access of voice, data, image and multimedia services, realize large-capacity transmission through optical fiber, and has a flexible system structure of cross-connection and a comprehensive network management system.)
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