BinTec RS120 Reference Manual page 550

Glossary
536
Proposal When an IPSec connection is being established, the initiator of the
connection makes proposals with relation to the authentication and
encryption methods to be used.
Protocol Protocols regulate the flow of a data communication on different
levels of the OSI model. Protocols control addressing, coding, au-
thentication, formatting, etc. Examples: Ethernet, IP, TCP, HTTP
Proxy A proxy is a network component. The proxy is an agent. It routes a
query from the source with its own IP address to the destination.
PVID The Port VLAN Identifier (PVID) is the standard VLAN ID for the port
concerned. A packet that reaches this port without a VLAN tag is as-
signed this ID.
Q-SIG Q-Interface Signalling Protocol (Q-SIG) is an ISDN-based signalling
protocol for linking PABX systems.
QoS Quality of Service (QoS) describes the properties of the communica-
tion service. It is defined using bandwidth, delay, packet losses and
jitter. To transmit time-critical data packets for VoIP or video stream-
ing as quickly as possible, QoS is used to sort all the data packets
into groups and forward them on in the network either more quickly
or slowly, depending on their priority.
Queue The data packets accumulate in a queue before they are sent.
RADIUS Remote Authentication Dial-In User Service (RADIUS) is a client-
server protocol for authenticating, authorising and accounting for
users with dial-in connections. The RADIUS server authenticates
the client, e. g. by checking the username and password. See also
TACACS+.
RE-ADSL2 See G.992.5.
Real Time Jitter Con- Real Time Jitter Control is used, where necessary, to reduce the
trol size of data packets during a telephone conversation so that voice
packets are not blocked.
Registrar The SIP server (registrar) needs to be used in case the subscribers
to a VoIP call are not using static IP addresses The SIP server re-
gisters the clients' IP addresses and sends this data to the SIP
proxy, which connects the calls. The SIP proxy and SIP registrar are
usually identical.
Repeater A repeater is a device that strengthens electric or optical signals and
thus increases the range of the network.
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