What Is The Isdn; The History Of Isdn; The Services - ELSA MicroLink ISDN/PCC-16 User Manual

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What is the ISDN?

ISDN stands for " I ntegrated S ervices D igital N etwork". The ISDN provides an integrated platform for
all forms of electronic communications; voice, text, data and image transfer can all be performed with
one digital connection. The advantage of digitalization is that the existing telephone infrastructure is
used, and to far greater effect. ISDN offers new and improved services via a single connection, higher
data transfer rates (64,000 bps) with improved quality and security, and all with the use of an
internationally standardized interface, the S

The History of ISDN

1979
1982
1984
1986
1988
1989
Since mid-1993
Late 1993
1994
Until 2000

The Services

The new and improved services include:
Interference-free telephony with constant volume, quicker connection and a higher speech
n
bandwidth (7.1 kHz)
Fax transmission with the group 4 standard for improved transmission quality and higher
n
resolution (400 dpi). The transmission time for an A4 side takes about 10 s. Unfortunately, fax
transmission with group 4 is not compatible with group 3 recievers.
The transmission of news via Teletex
n
Access to T-Online/Datex-J/Btx (in Germany) at up to 64,000 bps instead of analog's best of
n
33,6000 bps
Video telephony with (slow) image data transfer
n
The continued use of analog end devices via an a/b terminal adapter
n
MicroLink ISDN/PCC-16 Manual © 1997 ELSA GmbH
/S
0
The German Post authorities decide to develop a digital telephone network
The German Post authorities declare their intention to adopt the ISDN
standard for the digital telephone network
CCITT release a comprehensive set of recommendations for ISDN
ISDN pilot project in Mannheim and Stuttgart (D), with more than 400 ISDN
basic connections
ISDN as standard in operation
Foundation of Euro-ISDN: 26 network operators from 20 countries sign the
"Memorandum of Understanding" (MoU)
ISDN connections to Australia, Austria, Belgium, Denmark, Finland, France,
Great Britain, Hong Kong, Italy, Japan, Luxembourg, the Netherlands, Norway,
Singapore, Spain, Sweden, Switzerland, and the USA.
Euro-ISDN (DSS1) introduced to Germany
Nationwide ISDN coverage in Germany
The German national ISDN (1TR6) will continue to be offered by the Deutsche
Telekom.
.
2M
Appendix: What is the ISDN?
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