Trend AuroraPlus User Guide
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ISDN Explained
What is the ISDN?
The ISDN is an evolutionary circuit switched network based
on digital telephony. It uses a common set of interface
standards and allows users to send and receive information
over the network.
ISDN offers end-to-end (caller to receiver) digital
connectivity between Terminal Equipment (TEs), via
Network Terminators (NTs) and digital exchanges, both
private and public.
ISDN Services
ISDN services are the telecommunication services to which
the user has access either at an ISDN interface or a terminal
connected to the ISDN. The diagram below summarises the
services offered:
Chap01.P65 30/04/01, 16:2610
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