Siemens A31003-D3000-M100-01-76A9 Administrator User Manual page 244

Glossary
Example Dial Plan
244
SNTP
Simple Network Time Protocol. Used to synchronize the time of a terminal device
with a timeserver.
Subnet Mask
To discern the network part from the host part of an IP address, a device performs
an AND operation on the IP address and the network mask. The network classes
A, B, and C each have a subnet mask that demasks the relevant bits: 255.0.0.0
for Class A, 255.255.0.0 for Class B and 255.255.255.0 for Class C. In a Class C
network, for instance, 254 IP addresses are available.
Switch
Network device that connects multiple network segments and terminal devices.
The forwarding of data packets is based on MAC addresses: data targeted to a
specific device is directed to the switch port that device is attached to.
T
TCP
Transfer Control Protocol. The protocol belongs to the transport layer and estab-
lishes a connection between two entities on the application layer. It guarantees
reliable and in-order delivery of data from sender to receiver, as opposed to UDP.
TLS
Transport Layer Security. Ensures privacy between communicating applications.
Typically, the server is authenticated, but mutual authentication is also possible.
U
UDP
User Datagram Protocol. A minimal message-oriented transport layer protocol
used especially in streaming media applications such as VoIP. Reliability and
order of packet delivery are not guaranteed, as opposed to TCP, but UDP is faster
and more efficient.
URI
Uniform Resource Identifier. A compact string of characters used to identify or
name a resource.
URL
Uniform Resource Locator. A special type of URI which provides means of acting
upon or obtaining a representation of the resource by describing its primary
access mechanism or network location.
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OpenScape Desk Phone IP, Phone Administration, Administrator Documentation
A31003-D3000-M100-01-76A9, 02-2013