References
^ (2012). What Every Engineer Should Know about Data Communications, Vol. 19 ISBN 9780824775667 (revised Nov 2013)^ Carl Stephen Clifton (1987). What every engineer should know about data communications, CRC Press. Wiki. ISBN 9780824775667 (revised Aug 2013)^ What Every Engineer Should Know about Data Communications, CRC Press. Amazon. ISBN 9780824775667 (revised Nov 2014)
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