In telecommunication, the term network architecture has the following meanings:

1. The design principles, physical configuration, functional organization, operational procedures, and data formats used as the bases for the design, construction, modification, and operation of a communications network.

2. The structure of an existing communications network, including the physical configuration, facilities, operational structure, operational procedures, and the data formats in use.

Source: from Federal Standard 1037C and from MIL-STD-188

See also