Siemens A30853 - Manual (Page 56)

ISDN glossary
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glossar.fm5 27.11.98 Profiset 30isdn engl.: A30853-X300-B107-1-7619
Service indicator A feature of ISDN. The service indicator, which is sent with every ISDN
connection, indicates the type of connection required. If the service in-
dicator of the calling terminal does not correspond to that of the called
terminal, the connection is not established.
Standard rate access Service package for ISDN features.
System connection A particular type of ISDN connection. In the Euro ISDN, either the basic
rate acces or the primary rate access can be used for a system connec-
tion. The system connection is a point-to-point connection.
Three-party conference
(3PTY)
In a three-party conference, a user is simultaneously connected to two
other parties, whereby all three parties can speak to each other.
Toggle A special type of consultation whereby the two parties can be spoken
to alternately without interrupting the telephone connection.
TSI Abbreviation for ”Terminal Selection Identifier“. Used for the old German
ISDN protocol 1TR6 (no longer widely used) to address a number to ter-
minals connected to the same basic rate access. Nowadays, MSNs are
used for this function.
Western plug General term for connectors with 4 or 6 contacts with analog terminals
and 8 contacts with ISDN terminals.