Physical Layer Propagation UTP and Optical Fiber Chapter 3 Updated January 2009 XU Zhengchuan Fudan University
Physical Layer Propagation: UTP and Optical Fiber Chapter 3 Updated January 2009 XU Zhengchuan Fudan University
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
Test Your Understanding ·P141
4 • Test Your Understanding • P 141
Data Representation
Data Representation