Siemens 70isdn - Manual (Page 108)

ISDN glossary
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kap13.fm5 Profiset 70isdn, GB: A30853-X300-B501-3-7619 20.5.99
S
0
bus A line used from the network termination in the multi-device connec-
tion. Up to 12 connecting boxes and up to 8 ISDN terminals can be
connected to an S
0
bus; of these, however, only 4 ISDN terminals can
be connected simultaneously without separate power supply.
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 indicator 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. See also premium rate access.
System connection A particular type of ISDN connection. In the Euro ISDN, either the ba-
sic rate access or the primary rate access can be used for a system
connection. The system connection is a point-to-point connection.
Three-party conference In a three-party conference, a user is simultaneously connected to
two other parties, whereby all three parties can speak to each other.
Terminal adapter A device for interface adaptation, e.g. for connecting analog terminals
to an ISDN basic rate access.
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 Ger-
man ISDN protocol 1TR6 (no longer widely used) to address a number
of terminals 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 termi-
nals and 8 contacts with ISDN terminals.