Technical Terms
151
POTS
Plain Old Telephony System
This is the classic analog telephone.
Power over LAN
Power over LAN is used to identify a property of devices
with Ethernet connection, e.g. IP telephones. Thus, the
power supply is provided via the Ethernet connection line
and not via a power mains plug, as usual. In this case, the
Switch or the Hub to which this device is connected per
Ethernet must be able to guarantee the power supply via the
Ethernet line.
PSTN
Public Switched Telephone Network
Umbrella term for analog telephone networks, which usually
use digital switches.
QoS
Quality of Service
The quality in communication networks. Depending on the
standard or protocol, different parameters are used for evalu-
ating the properties, such as loss rate, availability, transfer
rate and delay.
Router
A router connects different kinds of networks to each other.
It recognizes the bordering networks and neighboring
routers and it determines the path of the data packet. This
connection can be created by using either a software or a
hardware solution.
RSVP
Resource Reservation Protocol
IETF standard to guarantee a certain transmission qualities,
such as bandwidth and priority via TCP/IP.
Server
The workstation computers are connected (e.g. via Ethernet)
to the server, which is the “central computer”.
SIP
Session Initiation Protocol
A network protocol which establishes a communication
session between two or more subscribers.
Smartphone
A smartphone unites the functional scope of a mobile phone
with that of a PDA. You can use a full keypad or touchscreen
and speak from a PDA phone. Digital cameras are
sometimes also incorporated, as in many mobile phones.
SNMP
Simple Network Management Protocol
Network protocol developed by the IETF - an open interna-
tional voluntary association of network engineers, manufac-
turers and users, which is responsible for proposals for
Internet standardization -, to enable network elements (e.g.
routers, servers, switches, printers, computers etc.) to be
monitored and controlled from a central station.
Term
Explanation
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