Physical Layer Propagation UTP and Optical Fiber Chapter 3 Updated January 2007 Panos Business data Networks and Telecommunications. th edition aonoaooonoo Copyright 2007 Prentice-Hal May only be used by adopters of the book
Physical Layer Propagation: UTP and Optical Fiber Chapter 3 Updated January 2007 Panko’s Business Data Networks and Telecommunications, 6th edition Copyright 2007 Prentice-Hall May only be used by adopters of the book
Orientation e Chapter 2 Data link, internet, transport, and application layers Characterized by message exchanges Chapter 3 Physical layer( Layer 1) There are no messages-bits are sent individually Concerned with transmission media, plugs, signaling methods propagation effects Chapter 3: Signaling, UTP, optical fiber, and topologies Wireless transmission is covered in Chapter 5 2
2 Orientation • Chapter 2 – Data link, internet, transport, and application layers – Characterized by message exchanges • Chapter 3 – Physical layer (Layer 1) – There are no messages—bits are sent individually – Concerned with transmission media, plugs, signaling methods, propagation effects – Chapter 3: Signaling, UTP, optical fiber, and topologies – Wireless transmission is covered in Chapter 5
Figure 3-1: Signal and propagation Transmitted Received Signal Signal (Attenuated& Distorted) Propagation Transmission medium Sender Receiver A signal is a disturbance in the media that propagates( travels) down the transmission medium to the receiver If propagation effects are too large, the receiver will not be able to read the received signal 3
3 Figure 3-1: Signal and Propagation Sender Receiver Transmission Medium Propagation Transmitted Signal Received Signal (Attenuated & Distorted) A signal is a disturbance in the media that propagates (travels) down the transmission medium to the receiver If propagation effects are too large, the receiver will not be able to read the received signal
Data Representation
Data Representation
Binary-Encoded data Computers store and process data in binary representations Binary means two There are only ones and zeros Called bits 1101010110001110101100111
5 Binary-Encoded Data • Computers store and process data in binary representations – Binary means “two” – There are only ones and zeros – Called bits 1101010110001110101100111