Allied Telesis AT-VP504E FXS (H.323) - Manual (Page 22)

Appendix A - Glossary Administration Manual (H.323 Version)
AT-VP504E FXS 18
N
Network
A group of two or more computer systems that are linked.
O
Off-hook
A line condition caused when a telephone handset is removed from its
cradle.
7On-hook
A line condition caused when a telephone handset is resting in its
cradle.
P
Packet
Group of bits transmitted as a complete package on a packet-switched
network.
Port
Network access point, the identifier used to distinguish among
multiple simultaneous connections to a host.
Private Branch Exchange (PBX)
A small to medium sized telephone system and switch that provides
communications between onsite telephones and exterior
communications networks.
Protocol
Defines a common set of rules and signals that computers on the
network use to communicate.
Public Switched Telephone Network (PSTN)
The local telephone company network that carries voice data over
analog telephone lines.