A network established and operated by a telecommunications administration, or a recognized private operating agency, for the specific purpose of providing data transmission services for the public.

A network that is established and operated by an administration or by a recognized operating agency (ROA) for the specific purpose of providing land mobile telecommunications services to the public.
Note: A PLMN may be considered as an extension of a fixed network, e. g. the Public Switched Telephone Network (PSTN) or as an integral part of the PSTN.

1. Any common carrier network that provides circuit switching among public users.
Note: The term is usually applied to public switched telephone networks, but it could be applied more generally to other switched networks, e.g., packet-switched public data networks.
2. A switched network accessible by the public for the purpose of originating and terminating telecommunications messages. [T1.209-1989]
3. Any common… (Read More →)

A telecommunications network usually accessed by telephones, key telephone systems, private branch exchange trunks, and data arrangements.
Note: Completion of the circuit between the call originator and call receiver in a PSTN requires network signaling in the form of dial pulses or multi-frequency tones.
The worldwide network of public switched (circuit) telephone networks is based on ITU-T Recommendation E.164 (“The… (Read More →)

A type of network element (NE) that contains a DUA (directory user agent), an optional local cache, and possibly other application processes such as the registration agent. The R-NE communicates with the DSA (directory system agent) via the DAP (directory access protocol). [T1.245-1997]

See network topology.

1. A satellite system or a part of a satellite system, consisting of only one satellite and the cooperating Earth stations. [RR]
2. A satellite system, or part of a satellite system, and the cooperating Earth stations.

A subnetwork that permits access from both untrusted external networks and from trusted internal networks, but does not permit traffic flow between the two. [2382-pt.35]

For a particular message path, any intermediate network between a branch point and a subsequent branch point or convergence point is a selected network. [T1.118-1992]

A network inserted in a circuit for the purpose of improving or modifying the waveform of signals.