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Hand Held ISDN Tester—User Guide
A2-2 427869
Introduction to ISDN
This chapter provides an overview of the Integrated Services
Digital Network (ISDN).
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 all 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 which the
user accesses either at an ISDN interface or a terminal
connected to the ISDN. The diagram below summarises the
services offered:
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