Communication Direction, Bandwidth
and Channels
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Frequency and Bandwidth - Communication Theory - Lecture Slides, Slides of Data Communication Systems and Computer Networks
This lecture is from Data Communication course. Keywords in this lecture are: Frequency and Bandwidth, Direction of Communication, Baseband and Broadband Channels, Direction of Flow, Simplex, Definition of a Communication Medium, Types of Media, Channel Characteristics, Baseband Transmission, Broadband Transmission, Frequency Spectrum
Typology: Slides
2013/2014
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Communication Direction, Bandwidth
and Channels
Frequency Spectrum and Bandwidth
Chapter Objectives (continued)
- Discuss communication channels and the splitting of bandwidth to accommodate multiple channels
- Describe baseband and broadband transmission and present practical examples in each case
Chapter Modules
- Direction of communication
- Communication channels
- Baseband and broadband channels
Direction Of Flow Simplex Half-duplex Full-duplex
A B
Direction Of Flow Details
- Simplex
- One direction only
- Radio broadcast
- Half-duplex
- One direction at any one point in time
- CB radio
- Full duplex
- Both directions at the same time
- Telephone lines
MODULE
The Concepts of Channels in Communication
A Definition of a Communication Medium
- One that allows the propagation of information carried by either electromagnetic or optical signals
Presence of Multiple Channels in a Physical Media Channel 1 Channel 2 One physical medium (Coaxial cable). Frequency F Frequency F Guard Band
Channel Characteristics
- A sub-bandwidth is assigned for each channel for communication
- Channel differentiation
- Each channel transmits using a different frequency
- The transmission frequency chosen for a channel is usually near the middle of the assigned bandwidth for the channel
- Guard bands are present around each channel to minimize interference
Channel Characteristics of the Example
- Channel speeds within a medium need not be the same
- Channel 2 in the previous example is faster than channel 1
- Channel 2 speed is Proportional to 150 Hz
- Channel 1 speed is Proportional 50 Hz
- Total bandwidth of the medium is computed as follows:
- 5 + 150 + 10 +50+5 =220 MHz
An Example of Multiple Channels in a Physical Medium TV 1 TV 2 TV 3 Cable TV (carries multiple channels) Tuned to Channel 33 at Frequency f Tuned to Channel 65 at Frequency f Tuned to Channel 77 at Frequency f
END OF MODULE
MODULE
Baseband and Broadband Transmission