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Appendix C: Glossary and Acronyms
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
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.
QoS
quality of service
A measure of telephone service, as specified by the Public Service
Commission.
RJ11
A six-pin jack typically used for connecting telephones, modems, and fax
machines in residential and business settings to PBX or the local
telephone CO.
SIP
Session Initiation Protocol
An IETF standard for setting up sessions between one or more clients. It
is currently the leading signaling protocol for Voice over IP, gradually
replacing H.323.
T1
A dedicated digital carrier facility which transmits up to 24 voice
channels (DS0s) and transmits data at 1.544 Mbps. Commonly used to
carry traffic to and from private business networks and ISPs.
VoIPon www.voipon.co.uk [email protected] Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
