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(2) Peripheral Hardware Peripheral hardware equipment to be installed in the master control center shall include a voice communications system and a keyboard printer terminal unit. Each unit of the peripheral equipment shall be self-contained. a. A telephone receiver and transmitter for the purpose of voice communication shall be provided for the master control center station of the telephone communication system. The telephone system shal l functi on with capabil sties for voice communications over one separate pair of communication lines between the master control center and the local intersection controller assemblies and the surveillance assemblies. Up to sixteen, but no less than 4, local controller cabinets may be serv i ced by one com-1 i ne pair for voice communication system. Communications access into the master computer shal 1 be provided over the same pair of 1 Ines by using a portable cathode ray terminal and acoustic coupler. The system shall have provisions for placing incoming calls from local intersection controller assemblies and surveillance assemblies onto a telephone in an office ad3acent to the master control center or to the signal maintenance shop via the "intercom circuit". Cable connections shall be made in a wall-mounted telephone terminal box. Arresters shall be provided for lightning protection on all incoming data and voice communication lines to the master control console. b. A keyboard printer terminal unit shall be provided on which hard copy required will be printed. The unit shall operate on 8-level code which is compatible with the American Standard Code for Information Interchange (ASCII). It shall be provided w;th a 4-row keyboard similar to an office typewriter. The unit shall operate at no less than 30 characters per second and shall have a carriage return which will automatically return the carriage to the left margin and move to the next typing position. Unit shall have integral noise suppression to limit noise level to that of normal office typewriter. A means shall be provided for automatically turning the complete unit on by command from the computer. The unit shall shut off as required after its last receipt of a transmission from the computer. (3) Wall-Mounted Display Map The wall display map shall be designed and constructed to display the following information: a. Green LED's shall indicate through-phase green movements on each main street. b. Yellow LED's shall indicate cross-phase green movements on each side street. c. Green LED's shall be OFF and other lights shall flash if intersection is in "Flash" mode due to master programming. -5-