In this module we shall discuss various aspects of data link control has been considered
.
Lesson deals with framing and synchronization along with how one can interface the
machine to the media
. Error detection and error correction techniques are presented in
Lesson
. Lesson introduces various protocols used for flow control and error
control
. Finally, lesson provides an overview of HDD, the most popular data link
control protocol
.
Module Switched Communication Networks
In this module switched communication networks has been considered
. First, various
switching techniques have been presented in Lesson . In this lesson various aspects of
circuit switching and the operation of Public Switched Telephone Network (PST),
which is based on circuit switching, have been discussed
. Various aspects of message
switching, packet switching and virtual circuit switching have been addressed in Lesson Lesson presents the Synchronous Optical Network (TONES) that defines a
technology for carrying many signals of different capacities through a synchronous,
flexible, optical hierarchy
. It utilizes the enormous bandwidth of optical fiber to achieve
date transfer at a very high rate
.
X.25 is a packet-switched network developed by ITS-T in 1976
. It defines how a
packet-mode terminal can be interfaced to a packet network for data communication
.
However, X.25 does not satisfy the present day requirements of higher data rate
. To
overcome these limitations, a new standard, known as frame relay was introduced
.
Lesson introduces these two packet switching networks
.
In the last section of this module, ATM (Asynchronous transfer mode), which can
be used both as a LAN or WAN standard has been introduced
. Various network devices
used in ATM, concept of cell transfer and cell format have been discussed.
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