ELSA LANCOM Business LC-4X00, Manual

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Glossary
ELSA LANCOM Business
144
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Data compression – Method for the reduc-
tion of the data volume to be transferred; data
compression can be used to increase the data
throughput of a connection (common process-
es: V.42bis, STAC, MPPC)
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D channel – ISDN signaling channel (dial-
ing, caller line identification, charge informa-
tion, establishment and termination); an ISDN
basic rate interface has one D channel and 2
B channels.
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Data packet – A data packet contains a
number of characters (control commands)
specified by a data network for the transfer of
data.
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DNS – Domain name server. Designation for
a server that provides a name service for ev-
ery computer of a
­
domain. A computer that
only knows the symbolic name of a destina-
tion can request the IP address associated
with the name from the DNS server.
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Domain – A domain is a logically limited
section of a network such as corporate net-
work or an Internet provider.
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DSS1 – Euro-ISDN; currently a commonly
used ISDN D channel protocol
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Dynamic channel bundling – Bandwidth-
on-demand; the bandwidth is increased by
automatically adding further B channels as re-
quired.
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DSS1 – A European standard developed by
the
­
ETSI for the D channel protocol (also
known as ”Euro-ISDN“). This standard has
been in effect in Germany since the end of
1993 and will replace the FTZ standard 1TR6.
ISDN connections will be available for a tran-
sitional period which support both standards.
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EAZ – The EAZ = is the terminal device selec-
tion number used in the 1TR6 protocol to dis-
tinguish terminal equipment connected to the
same ISDN
­
base rate interface. Callers will
attach this digit at the end of the telephone
number.
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Ethernet network – An Ethernet network is
a
­
bus system with
­
CSMA/CD (carrier
sense multiple access with collision detec-
tion) access and
­
baseband transmission.
This local network type was developed in
1979 by DEC, Intel and Xerox. As one of the
first
­
LANs, it became a de-facto standard
and was adopted as an official standard by
the IEEE (Institute of Electrical and Electronics
Engineers, standard 802.3). The data transfer
takes place via coaxial, twisted-pair, fiber op-
tic or other conductors at a rate of 10 Mbit per
second.
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ETSI – European Telecommunications Stan-
dards Institute. This is the standardization au-
thority which developed the European D
channel protocol (DSS1).
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Firewall – Mechanism to protect intranets
from unauthorized access; the ELSA LANCOM
supports IP masquerading, port filtering and
access lists as firewall mechanisms.
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Flash ROM – Flash ROM is type of memory
that can be erased and rewritten electrically.
Flash ROMs are frequently used in devices in
which the firmware can be updated.
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Gateway – Network component that pro-
vides access to other network components on
a layer of the
­
OSI model (e.g. on layer 3 in
Windows 95).
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HDLC – High Level Data Link Control. Format
of a data packet that is secured using a CRC
calculation.
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Hops – Number of routers along a specific
network connection.
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Hub – Network component; distributor; col-
lector; also used for the conversion of one