ENG EC 441 Lecture Notes - Lecture 1: Wireless Lan, Local Area Network, Satellite Link
14 Sep 2017
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Other network devices (laptops, smartphones, tablets, tvs, gaming consoles, : communication links: optical fiber, coax cable, copper wire, radio spectrum, Different types transmit data at different transmission rates (bits/second) A network: a network can be defined as two or more nodes connected together by. Internet"s edge: end systems connect into internet via access isp (internet service provider, access isp provides either wired or wireless connectivity using array of access networks. Dsl (digital subscriber line: access networks - physically connects hosts to first router (packet switch) Obtained access from same local telephone company"s (telco) wired local telephone line telco is also the isp. Dsl modem connects to telephone line (copper wire) to dslam (digital subscriber line access multiplexer) located in telco"s local central office (co) Residential telephone line carries both data and traditional telephone signals simultaneously encoded at different frequencies. Data carried downstream and upstream channel at dsl modem and at dslam analog signals translated to digital format.
