1. How Circuit-Switched Digital
Networks Work
・Digital signal processing(DSP)
・Integrated Services Digital
Network
(ISDN)
・Internet Protocol Suite
・Modem
2. Digital signal processing(DSP)
Digital signal processing (DSP) is concerned
with the representation of signals by a
sequence of numbers or symbols and the
processing of these signals.
3. Integrated Services Digital Network
(ISDN)
Integrated Services Digital Network
(ISDN) is a set of communications standards
for simultaneous digital transmission
of voice, video, data, and other
network services over the traditional
circuits of the public switched telephone
network.
4. Internet Protocol Suite
The Internet Protocol Suite is the set of
communications protocols used for the
Internet
and other similar networks.
5. Modem
A modem (modulator-demodulator) is a
device that modulates an analog carrier
signal to encode digital information,
and also demodulates such
a carrier signal to decode the
transmitted information.
