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Sonata
Hand Held ISDN Tester—User Guide
A4-4 427869
Collision Interference between packets of data which are
transmitted simultaneously by 2 stations on the same
medium.
Companding A compressing/expanding process for reducing the noise
transmitted in a signal.
Connection A concatenation of transmission channels or telecoms
circuits, switching and other functional units set up to
provide for the transfer of signals between points in a
telecoms network, to support a single communication.
Contention The situation where multiple sources compete for the
same resource.
CPN Called Party Number. The number dialled by the calling
party.
Crosstalk Interference occurring when data is transmitted on
different mediums which are adjacent to each other.
CUG Closed User Group.
D Bit Delivery confirmation bit or acknowledgement. Can be
Local or End to End.
D Channel Demand channel. This is one of the multiplexed channels
in the ISDN information stream. It carries signalling and
call setup information and can also be used for packet data
transmission to the subscriber.
DASS Digital Access Signalling System. A signalling standard
designed for use between PABXs and public exchanges in
the UK.
Data Digital information, which may be text, voice or video.
Digital An exchange that switches digital signals by means of
Exchange digital switching.
DMS Digital Multiplex System (Nortel trademark).
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