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1813 VoIP Gateway User’s Guide
node: A connection or switching point in a network, also called a host.
noise: Unwanted interference to a transmitted signal by an outside source.
PAP: Password Authentication Protocol. PPP protocol that ensures authentication of the
connection between two devices.
PAT: Port Address Translation is a form of NAT that maps multiple Private IP addresses to a
single Public IP address.
ping: An internet utility signal sent to check the accessibility of a device.
Plug-and-Play: The ability of a PC to configure expansion boards and other devices
automatically without requiring the user to turn off the system during installation.
point-to-point connection: Any connection with only two endpoints. A dedicated data link
that connects only two stations.
poison reverse: A routing protocol command that tells its neighbor gateways that one of the
gateways is no longer connected.
POP: Point Of Presence.
Port: An access point where data can enter or exit.
POTS: Plain Old Telephone Service.
PPP over ATM: Point-to-Point Protocol over Asynchronous Transfer Mode.
PPP: Point-to-Point Protocol. A protocol (RFC 1661) for transmitting packets over serial links
between devices made by the same or different manufacturers.
PPPoE: Point-to-Point Protocol over Ethernet. A method for establishing sessions and
encapsulating PPP packets over an Ethernet, specified by RFC 2516.
PPTP: Point-to-Point Tunneling Protocol. An extension of Point-to-Point Protocol used to
create virtual private networks between PCs.
protocol: A set of rules that govern the transmission of data between interconnected devices to
maintain or improve communication.
proxy server: Provides a list of items available on other servers to increase the availability and
speed of retrieving that information.
PSTN: Public Switched Telephone Network. The standard telephone network.
PVC: Permanent Virtual Circuit. Virtual circuit that is permanently established.
QoS: Quality of Service. The expected data loss or latency.
remote access: Communication from a remote location or facility through a data link.
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