Technical Terms
152
SNTP
Simple Network Time Protocol
Standard for synchronizing clocks in computer systems over
packet-based communication networks. Although mostly
handled via UDP, can also be transported using other layer 4
protocols such as TCP. Specifically developed to enable
reliable timing over networks with variable packet propaga-
tion time (ping).
Voice Compression
The voice data are compressed and sent via the network.
This reduces the amount of data to be transmitted. This is
especially important for the Home Office connection and the
coupling of several branch offices via the Internet.
STUN
STUN is a simple network protocol that recognizes the
existence and type of firewalls and NAT routers and uses
this information to bypass them.
Subnet
A network can be divided into several subnets. For example,
it is possible to use the IP address 192.177.65.xxx to address
all computers, which have the number 192.177.65. in
common and which only differ from one another in terms of
the last three digits (xxx). The subnet mask indicates which
positions should be used for differentiation within the
subnet. In a subnet, two subscribers communicate directly
with each other. The IP packets only have to pass through
the router if subscribers communicate outside of the subnet.
Switch
A Switch is an active hub, which functions as a kind of
exchange. In contrast to the hub, the switch does not forward
the incoming data packets to all lines, but rather only to that
line which leads to the destination of the packet.
TA
Terminal Adapter
TAPI
Terminal Application Programming Interface
Interface for programming terminal applications
TE mode
Terminal Endpoint
see
TEI
Terminal Endpoint Identifier
With the help of the TEI, different terminals are addressed to
an ISDN bus on Layer 2.
TCP/IP
Transmission Control Protocol / Internet Protocol
Two commonly used protocols for the transfer of data and
for Internet connection, which can be implemented on
different types of transport media.
TSP
TAPI Service Provider, driver for TAPI devices
Term
Explanation
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