21-04-2012, 04:51 PM
Advanced Traffic Control System
systems-pyramids-specification.pdf (Size: 167.13 KB / Downloads: 78)
System Description
The system software shall not be a prototype or software custom-developed for this project.
The system software shall communicate directly with the local intersection controllers. The ATCS shall interface with
the Wapiti MicroSystems W41KS (rev. 55a) local software packages, employing Econolite’s enhanced protocol. In
addition, the ATCS shall interface with OASIS/OSM 2070 Master/Local controller program from Econolite. The
ATCS shall be designed to mix and match different controllers seamlessly into one system.
General
The overall architecture of the system shall be a client server design based on distributed open architecture concepts.
Processing shall be distributed and “open” communications protocols shall be used for all interfaces. Client
workstations shall access networked file servers that perform traffic management, system communications, database
management, and system graphics.
Local Area Network Requirements at Central
A 10/100 Base-T Ethernet, Local Area Network (LAN) shall support the distributed client/server architecture. The
LAN shall be installed and tested. The LAN shall be connected to the central hardware via full duplex 100 Base-T
links, 10 Base-T links/100 Base-TX auto-sensing links, and RS-232, and RS-485 links. These links from the central
hardware shall be interconnected via the Ethernet LAN switch. The LAN shall also include network performance
management software and remote access to the system. The LAN shall be configured in a star topology centered on
the Ethernet LAN switch. All connections to the LAN shall be made using Cat5 cables.
Communications System Server
The system shall be provided with a communications server that has the same provision and requirements of the
distributed file server. This server may be used as the distributed file server if that server fails.
Backup Intersection Operation
The ATCS shall provide for back-up intersection operation in case of failure of the distributed system file server,
communications server, or the communication system. This back-up shall be accomplished by means of Time-Based
Coordination (TBC) provided by the local controller software. The local controllers shall automatically implement
TBC, according to the day plan programmed into the controller whenever communication is absent.
Clock Updates
Upon login, each workstation clock shall be automatically updated by the Microsoft Windows™ operating system to
the current time of the distributed system server clock.
Remote Access
The ATCS shall allow full access to the system for a multiple user by means of remote dialup facilities, or Ethernet
access through a secured firewall, using Microsoft Terminal Services. The remote user shall be allowed to perform
any functions, permitted by Terminal Services, and available to any other user with the same level of security
regardless to where the user is physically located.