Digium Asterisk Appliance 50 AA50 Administrator's Manual page 167

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.
Release 1.20
Appendix D Glossary and Acronyms
Digium, Inc. Page 167