An introduction to the concepts and principles involved in the
transfer of voice signals. Introduces the basic concepts of Analogue
voice, signalling and switching. It also looks at some of the
processes that have evolved including Echo suppression and
Outlines the history of the telephone, and looks at the concepts
behind the handset and the circuitry that makes up the local loop.
Introduces the concept of multiplexing using frequency (FDM) in the
public telephone network.
Introduces the concept of digital signals and how analogue to
digital conversion is used in telephony. This section also outlines
the concepts behind Time Division Multiplexing, G.703/G.704 framing
and the basics of PDH and SDH transmission.
Introduces the physical media which are used to transmit telephony
signals and the characteristics involved in the process. Includes
Copper cabling, Fibre cabling and Radio transmission.
The transmission of telephony through a network involves a large
element of signalling to control the process. This section reviews
the most common signalling system (SS7) in use (especially in the
Voice Communication Systems
At the heart of a company voice communications system has been, and
often still is, the PABX. This section looks at some of the
processes involved with PABX operation, including numbering, key
systems, least cost routing, ACD, CTI, automated attendants (IVR)
The voice telephony industry didn’t stand still and this section
looks at some of the concepts that have been introduced over the
years. This includes ISDN, ATM, intelligent networking, xDSL access
(broadband) and Voice over IP.