This page shows the status of ITS Servers. There are two catagories of flows listed on the Data Flow Statas Page. Data Sources are flows comming into the ITS at UW. SDD Transmitters are flows leaving ITS at UW. Each data flow is monitored using the Unix utility tcpdump. This utility looks at the headers of packets traveling through the network. A Perl script examines these headers and updates the web page. This page only shows if a server is active. The content of any packets the server sends or receives is not examined.
There are two data source flows that this page monitors. Each shows packets coming into the ITS network at UW.
This flow contains raw bus data being sent to the UW. AVLUW, a machine running BSD Unix, is the server sending this data. This machine sits behind a firewall and this machine may not be administered mremotely. It may be rebooted using teleboot.
This flow contains raw loop data from traffic sensors. TMSUW is the server sending data. It reads the Real-Time Database of the WSDOT Traffic Management System approximately every 20 seconds. If this server is killed it must be restarted manually.
This is a flow used by MDI. This server is "upstream" from the UW -> MDI flow. This server takes in loop data and makes SDDs, including an extractor.
This is the flow of SDD to the Traffic Channel. The self-describing data sent here contains traffic data, such as images and speed data. This server, named TMS_SDD, is a multiplexer running on the WindowsNT platform. The version 1.0 SDD's that it sends to not contain an extractor.
This is the flow from ITS at the UW to MDI (Model Deployment Initiative) projects sponsered by Smart Trek. This server, named TMS_SDD_EXTRACT, is a multiplexer running on the WindowsNT platform. The version 2.0 SDD's that this server sends come with an extractor.
This is the flow from ITS at the UW to Transit Watch prediction servers. These servers receive v2.0 SDD created from raw AVL data. There is a prediction server for each Transit Watch location. These servers are written in Java and the end-user Transit Watch display program is a Java Applet.
This is the flow from ITS at the UW to Busview server. This application is written in Java and its clients are Java Applets. This server sends AVL data.
This is a data flow from Metro Traffic control, produced by the Etak Traffic Workstation for broadcast over Seiko's FM subcarrier system. It is received by pager watches throughout the Peuget Sound region. The data flow cosists of traffic incident messages and uses the Sekio Bearer Application Protocol (BAP) to encapsulate the messages.