L3 - Sections 1.5.2 - 1.5.4 deal with specific networks...

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Sections 1.5.2 - 1.5.4 deal with specific networks (discuss later) - X.25, Frame Relay, ATM, Ethernet. Sec. 1.6 - Standardization - read for details. Compatibility, economies of mass production. De facto - standards that arose from popular use. De jure - formal standards arrived at by an authorized standards body. International ISO, International Standards Organization ITU, International Telecommunications Union National FCC, common carrier organizations in U.S., Post Telegraph and Telephone in other countries. ANSI, NIST, IEEE in U.S.
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Limitations to Data Communication rates. Concepts about frequency domain relate to time signals. Signals are frequency-limited for one of two reasons: 1) Different communication sources share a wireless or wired link. they are confined to different bands of frequency so as to not interfere. 2) Communication medium limitations. On cables, attenuation/meter is higher for higher frequencies. The maximum data rate in bits per second is
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L3 - Sections 1.5.2 - 1.5.4 deal with specific networks...

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