User manual

Release 1.01 Digium, Inc. Page 53
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
Standard phone service over the public switched telephone network
(PSTN). This service provides analog bandwidth of less than 4 kHz.
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.
PSTN public switched telephone network
A communications network which uses telephones to establish
connections between two points. Also referred to as the dial network.
QoS quality of service
A measure of telephone service, as specified by the Public Service
Commission.
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