Digium TE820 User Manual download pdf (Page 72)

Appendix C Glossary and Acronyms

PBX Private Branch Exchange

A smaller version of a phone company’s large central switching office.

Example: Asterisk.

PCI peripheral component interconnect

A standard bus used in most computers to connect peripheral devices.

POP Point of Presence

The physical connection point between a network and a telephone

network. A POP is usually a network node serving as the equivalent of a

CO to a network service provider or an interexchange carrier.

POTS Plain Old Telephone Service

The public switched telephone network (PSTN) is the network of the

world's public circuit-switched telephone networks. Originally a network

of fixed-line analog telephone systems, the PSTN is now almost entirely

digital, and now includes mobile as well as fixed telephones.

PPP Point-to-Point Protocol

Type of communications link that connects a single device to another

single device, such as a remote terminal to a host computer.

PRI

Primary Rate ISDN

PSTN Public Switched Telephone Network

A communications network which uses telephones to establish

connections between two points. Also referred to as the dial network.

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Digium TE820 User Manual Page 72