الفهرس 
DATA COMMUNICATIONS: A REVIEW’Only 14 pages are availabe for public view
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Abstract
Inthis thesis different methods for testing the transmission
impairments on analogue telephone channels (lines) are discussed.
M.easurements may be performed either in the planning
stage, during _operation or in the presence of faults.
The sources of error in data links can be determined if the
test results are compared with CCITT recommendations (Ml020
and V.S3) for data Transmission.
The first chapter is a general overall survey of data communication
links and computer networks.
Chapter two discusses the effect of the transmission impairments
on the data transmitted ~Gv~r analogue channels and
the relation with the bit error rate, specially in the pres-
ence of random and impuls\”e.noise.
Chapter three is a review of the important performance tests
and the theory of operation of some measuring equipments used
to carry out the data tests.
Chapter four is a practical application to determine the
so~rces of error in two given examples. The first one tests
the transmission impairments on an analogue microwave link.
The source of data errors is the protection switching system.
The second example is a switched line between two telephone
exchanges. The source of data errors is the impulsivenoise Also, the correlation coefficient between impuls’~noise and
bit error rate is calculated.
At the end of the Chapter there is an example showing the
implementation of a terminal to computer communication link.
This link is one of the tested switched lines.
Chapter five summarizes the results of all the tests conducted
in all the experiments and how they can be applied to data
communication links..