ELSA MicroLink ISDN/PCC-16 User Manual page 50

Appendix: Glossary
Host
ISDN
ISDN a/b adapter
ITU-T
MSN
Multiple Subscriber
Number
NT
Primary Rate
Interface
S interface
0
Semi-permanent
connection
S/T interface
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many standard communications programs (e.g. Telix, Telemate, Frontdoor or
Binkly).
Host designates a central computer that carries out certain functions for other
units (e.g. terminals), such as file handling etc.
Abbreviation of Integrated Services Digital Network.
ISDN a/b adapters are used to connect non-ISDN devices to the ISDN. An
ISDN a/b adapter, for example, connects devices designed for analog
telephone networks, such as analog telephones, class 2 and 3 fax devices,
modems etc. to the ISDN.
The Telecommunications Standardization Sector of the International Telecom-
munications Union (ITU) is working on the standardization of data and
telephone services. The ITU-T standards of the V. series mainly deal with
data transmission across telephone networks, while the I. and Q. series are
standards for the ISDN. The ITU-T is the successor organization of the CCITT
(Comité Consultatif International Télégraphique et Téléphonique).
Multiple Subscriber Number. The
numbers to be assigned by the exchange operator to a single ISDN line.
Normally these are three numbers, but may be up to eight. Similar to the
EAZ digits of the → → 1TR6 protocol, these numbers can be used to select one of
several terminal devices connected to the same
digit, which is appended to the access number, an MSN is a unique and
proper access number up to eight digits long.
→ MSN
Network Terminator. This is a device installed on the terminal side of an
ISDN → → Basic Rate Interface which converts the signals coming from the
exchange into the form needed by the
ISDN interface providing 30
→ → control channel (64,000 bps). At the time of press, this ISDN connector is
only used for large private branch exchanges.
Also called S/T interface .
Terminator ( → → NT) of a
Up to eight terminal devices can be operated simultaneously on one S
and up to 12 connection sockets can be connected to the bus.
A leased-line connection on demand. This service is provided for the German
→ → 1TR6 protocol only and can be ordered for any pair of ISDN stations and
separately for each B channel. Semi-permanent connections are leased for a
monthly flat rate independent of the length of the actual calls and can give
significant cost savings in the case of frequent or long calls.
Another name for the → →
→ → DSS1 protocol allows several access
S interface, and vice versa.
→ →
0
data channels (64,000 bps each) and one
→ →
Serial bus interface between the Network
→ → Basic Rate Interface and the ISDN terminal devices.
S interface, used for example in the USA.
0
MicroLink ISDN/PCC-16 Manual © 1997 ELSA GmbH
→ → S bus. Unlike the EAZ
0
0
→ →
bus,