A Network Node is a web server that facilitates the interface between database systems and the Network. It is an entity's "point of presence" on the Exchange Network. Using standards-based web services and eXtensible Markup Language (XML) schema, Nodes securely initiate and respond to requests for information. With properly configured Nodes, Network trading partners can seamlessly exchange data regardless of hardware, operating system, or programming environment.

Nodes are defined by their specific function, rather than what they are in a physical hardware sense. Network participants may use several different hardware and software approaches and combinations to establish a Node. For example, a Network participant could implement a Node with: 1) specialized Node software on a dedicated server; 2) one or more types of software on more than one server; or 3) existing enterprise software on an existing server. Network partners are free to choose their own approach to Node establishment–what is important is that the Node performs its functions as outlined in the Network Node Functional Specification.

State and EPA personnel building Network Nodes are strongly recommended to build a Node that can both request data from the Network, as well as publish data to the Network in response to requests from other Network Nodes. Alternatively some States and Tribes have chosen to work with a Node client.  Node Clients can submit, request, and receive data on the Network, but cannot respond to data queries from other Nodes.

If you have questions regarding Node implementation or require any assistance, please contact the Exchange Network Help Desk at 1-(888)-890-1995 or nodehelpdesk@csc.com. The Help Desk is open for business on weekdays between the hours of 8:00am and 6:00pm (Eastern).

You may also wish to consult the Exchange Network Message Board for additional assistance.

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