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Siemens 70isdn User Manual

Page 108

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ISDN glossary

96

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.