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| Term |
Definition |
| Packet |
In data communication, the basic unit of information transferred. |
| PBX (Private Branch Exchange) |
An in-house telephone switching system that interconnects telephone extensions to each other, as well as to the outside telephone network. |
| PRI (Primary Rate Interface) |
An ISDN service that provides 23 64-Kbps B (Bearer) channels and one 64-Kbps D (Data) channel (23 B and D). |
| PSTN (Public Switched Telephone Network) |
The worldwide set of interconnected switched voice telephone networks that deliver fixed telephone services to the general public and are usually accessed by telephones, key telephone systems, private branch exchange trunks, and certain data arrangements, transmitting voice, other audio, video, and data signals. Completion of a PSTN circuit between the call originator and the call receiver requires network signalling in the form of either dial pulses or multifrequency tones. The PSTN includes local loops; short-haul trunks; long-haul trunks, including international links; exchanges; and switching technology. |
