ECE 453 â€“ Introduction to Computer Networks. Lecture 3 â€“ Physical Layer II. Physical Layer. Services â€“ transmit bits from sender to receiver. Transmission media Guided: twisted pair, coax, fiber Unguided (wireless): radio, microwave, infrared Examples of communication networks
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Lecture 3 – Physical Layer II
(a) Fully-interconnected network (1876)
(b) Centralized switch (1878)
(c) Two-level hierarchy.
Digital fiber optics
Analog twisted pair
2400 baud line
Number of samples per second
(a) V.32 for 9600 bps.
(b) V.32 bis for 14,400 bps (fax)
A typical ADSL equipment configuration.
An early cable television system.
The fixed telephone system.
Frequency allocation in a typical cable TV system used for Internet access