RES 87202 - Laserfiche WebLink

d. All LED's shall be off in case of interconnect failure or other loss of interconnect power. e. Red LED's shall indicate for each intersection that it is "on-line" and in coordinated mode. Indication shall be given that the intersection is in full coordination or that the intersection is not. The' display shall be determined from field conditions (i.e., actual signal operation) rather than by information originated by the master. A pilot lamp test switch shall be added to the existing display map or all lamps shall be converted to LED type. LOCAL SURVEILLANCE--Local surveil 1 ance' assemblies (sampling detector stations) shall be available for installation at each location, using vehicle detectors for traffic count sampling and speed calculations. (Local controller assemblies with interconnect equipment, multiplex and telemetry circuits, speed calculation and count sampling detectors shall also be considered as local surveillance assemblies.) The survei 11 ance assemblies shal 1 transmit traffic counting information for up to 6 sampling detectors and coded vehicle speed information for 2 sets of speed calculation detectors. Speed calculations may be determined by the travel time and distance between the detectors method or by single loop method. The distance between speed calculation detectors shall be progranmnable at the master. Where noted on the plans, detectors shall provide dual or multi purpose functions, i .e., a count sampling detector may function as one of the speed calculation set and as a controller vehicle extension detector. Multi purpose detectors shall be provided with logic and isolation devices to prevent cross-feeding different functions. Attention is directed to the section "Speed Calculation Routines" under "SOFTWARE" of these special provisions. Portable Cathode Ray Tube Terminals. Additional terminals with acoustic coupler, shall be available, with the master computer via the telephone transmitter and receiver of the master control center communications systen or at any of the local intersections within the system. Each terminal shall communicate directly with the master computer to allow interrogation, display and changs the system or intersection parameters. : Each terminal shall be of modular- solid state design and shall include a cathode ray tube display, an alphanumeric keyboard and an integral acoustic coupler. The CRT shall be capable of displaying at least 16 lines of 64 characters on its screen at one time. (1) Acoustic CoUpler--Each terminal shall have an integrally mounted acoustic coupler, which shall accommodate a standard telephone handset. The acoustic coupler and telephone handset shall be the method of interfacing and data transmission between the terminal and master computer. Additionally, the acoustic coupler and its associated circuitry shall be designated to transmit at 10 or 30 -6-