ELSA LANCOM Business LC-4X00, Руководство пользователя

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Glossary
ELSA LANCOM Business
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been established, but on a flat monthly rate.
This may result in savings of communications
charges.
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Stac compression – Data compression
process
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Stand-alone solution – The ELSA LANCOM
Business 4100 is a stand-alone solution be-
cause no additional computers must be set up
or additional software installed on a server as
was previously the case with conventional
routers. In other words, it is an independent
network component.
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Leased line – A leased line is a permanent
connection between two participants for their
exclusive use.
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Signaling channel – ISDN signaling chan-
nel (also
­
D channel), for the transfer of con-
trol information (e.g. the signaling of an
incoming call, etc.) between the exchange
and the ISDN network terminator, with a
transfer capacity of 16 kbps for
­
Basic Rate
Connections or 64 kbps for
­
Primary Multi-
plex Connections.
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Synchronous transfer – Synchronous
transfer is, like
­
asynchronous transfer, a
process to achieve synchronism between the
transmitter and receiver. In this data transfer
format, synchronism is not achieved with
start and stop bits for a whole character as
with asynchronous transfer, but clock pulses
for each individual bit. As no start or stop bits
must be sent, synchronous transfer is faster,
but also significantly more complex to realize.
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TCP/IP – Transmission Control Protocol/In-
ternet Protocol. The Internet Protocol is an
extensive protocol family developed by the
DoD (Department of Defense) in the early
1970s for the secure interconnection of heter-
ogeneous Wide Area Networks. The two
foundations of this protocol family are IP,
which implements layer 3 of the
­
OSI model,
and the corresponding TCP for the fourth lay-
er.
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Telnet – Telnet is a protocol of the
­
TCP/IP
protocol family. It permits remote access
from a workstation to another computer sys-
tem in the network. As it requires secure bi-
directional communications, the telnet
protocol uses the
­
TCP protocol for data
transfer. A virtual terminal on the host is thus
placed at the telnet client's disposal.
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TFTP – Trivial File Transfer Protocol; a simple
protocol for file transfers such as firmware
uploads, or the backup and restoration of con-
figurations.
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TICS – System time unit of the ELSA LAN-
COM
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Transceiver – A transceiver is a device that
transforms the input signal format to a differ-
ent output format.
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UDP – User Datagram Protocol = transfers
data in certain IP network services, but unlike
TCP does not provide secure data transfer.
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UNIX – UNIX is an operating system devel-
oped by AT&T for high-performance micro-
computers, computers and mainframes.
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V.24 interface – Serial interface, port used
to connect modems, for example; the ELSA
LANCOM has a V.24 interface to permit ana-
log dial-ups via a connected modem.
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V.42bis – Recommendation of the
­
ITU-T
with regard to the compression of data within
a data stream.
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V.110 – Recommendation of the
­
ITU-T with
regard to the adaptation of asynchronous and
synchronous serial data streams to the ISDN
bit rate of 64 kbps in the ISDN
­
B channel
(also known as I.463).