Siemens A30853 User Manual

Page 55

ISDN glossary

glossar.fm5

27.11.98

Profiset 30isdn engl.: A30853-X300-B107-1-7619

Dual tone multi-

frequency (DTMF)

A signalling method whereby the information is transmitted to the

switching centre in the form of tones with various frequencies.

Euro ISDN

Uniform European ISDN standard introduced at the end of 1993.

Hold

The ”Call hold“feature. The non-communicating state of the user put on

hold in the course of a consultation or toggle action.

Hunt group

A number of terminals can be accessed under one call number or are

switched together to one connection. A number of basic rate accesses

can also be switched together to one connection.

ISDN

Abbreviation for Integrated Services Digital Network. Service-integrat-

ing digital telecommuications network which integrates telecommuni-

cations services such as telephone, telefax,, data and image transmis-

sion in a network.

ISDN service

The ISDN network offers several additional services to make communi-

cation more convenient, e.g. call forwarding, three-party conference.

These additional features are called ISDN services.

LTU

Abbreviation for “ISDN line trunk unit“ .Connecting box for digital

terminals on the S

bus.

MSN

Abbreviation for Multiple Subscriber Numbers; a multiple subscriber

number of the ISDN basic rate access in a multi-device connection.

Multi-device

connection

A connection whereby a number of terminals can be operated simulta-

neously on an S

bus in point to multipoint operation.

Multiple Subscriber

Number (MSN)

Assigned by Deutsche Telekom for an ISDN basic rate access with multi-

device connection. Multiple subscriber numbers are used for direct in-

ward dialling to the terminal but, unlike the direct inward dialling number,

are completely independent of each other.

NTBA

Abbreviation for Network Termination for Basic Access. Network

termination of an ISDN basic rate access which is installed by or can

be obtained from Deutsche Telekom.

Park (TP)

ISDN service. Abbreviation for Terminal Portability and means that a call

can be parked in order to unplug the telephone from one socket and

plug it into another socket of the same S

bus.

Point-to-multipoint

operation

Is an ISDN multi-device connection whereby a number of ISDN termi-

nals can be operated on an S

bus.

Point-to-point

operation

An example of point to point operation is the primary rate access. In this

case, only one terminal can be operated on the connection. For this rea-

son, it is called a system connection. In most cases, the system con-

nected is an ISDN PBX.

Primary rate access

ISDN connection equipped with 30 B channels each offering 64 kBit/s.

Primary rate access (system connection) is only available in connection

with a standard rate or premium rate access.

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 con-

nected to an S

bus; of these, however, only 4 ISDN terminals can be

connected simultaneously without separate power supply.