BUSI 4404 Lecture Notes - Lecture 3: Cable Television, Time-Division Multiplexing, Wavelength-Division Multiplexing
30 May 2017
School
Department
Course
Professor
Document Summary
Circuit configuration: point-to-point circuits include most wired connections today, multipoint circuits are most commonly used in wireless today, shared circuits (multipoint) are less expensive. Data flows both directions, but only one at a time (half-duplex) Data flows simultaneously in both directions (full duplex) Divide high-speed circuit into several slower (logical) circuits. Guard bands separate channels to prevent interference. A variant of fdm used in fiber optic circuits. Makes use of multiple light wavelengths to divide circuit into channels. Dense wdm can divide circuit into more than 100 channels per fiber each transmitting at 10gbps. More efficient than fdm, but may have idle time slots. Designed to reduce idle time slots by allocating slots based on statistical network usage (-ve) potential time delays when actual usage does not match statistically allocated time slots. Combines many low-speed circuits into one high-speed circuit. Physical matter used to carry voice or data transmissions.
