BZU PAGES: Find Presentations, Reports, Student's Assignments and Daily Discussion; Bahauddin Zakariya University Multan Right Header

HOME BZU Mail Box Online Games Radio and TV Cricket All Albums
Go Back   BZU PAGES: Find Presentations, Reports, Student's Assignments and Daily Discussion; Bahauddin Zakariya University Multan > Institute of Computing > Bachelor of Science in Telecom System > BsTS 3rd Semester > Data Communication


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
  #1  
Old 18-03-2011, 06:27 PM
bonfire's Avatar
M.Arsalan Qureshi

 
Join Date: Oct 2008
Location: Garden Town, Multan Cantt
Posts: 616
Program / Discipline: BSTS
Class Roll Number: 09-31
bonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond reputebonfire has a reputation beyond repute
Default Transmission Media

Transmission Media

* Transmission media lie below the physical layer.

* A guided medium provides a physical conduit from one device to another.
* Twisted-pair cable, coaxial cable, and optical fiber are the most popular types of guided media.
* Twisted-pair cable consists of two insulated copper wires twisted together. Twisting allows each wire to have approximately the same noise environment.
* Twisted-pair cable is used in telephone lines for voice and data communications.
* Coaxial cable has the following layers (starting from the center): a metallic rod-shaped inner conductor, an insulator covering the rod, a metallic outer conductor (shield), an insulator covering the shield, and a plastic cover.
* Coaxial cable can carry signals of higher frequency ranges than twisted-pair cable.
* Coaxial cable is used in cable TV networks and traditional Ethernet LANs.
* Fiber-optic cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.
* Fiber-optic cables carry data signals in the form of light. The signal is propagated along the inner core by reflection.
* Fiber-optic transmission is becoming increasingly popular due to its noise resistance, low attenuation, and high-bandwith capabilities.
* Signal propagation in optical fibers can be multimode (multiple beams from a light source) or single-mode (essentially one beam from a light source).
* In multimode step-index propagation, the core density is constant and the light beam changes direction suddenly at the interface between the core and the cladding.
* In multimode graded-index propagation, the core density decreases with distance from the center. This causes a curving of the light beams.
* Fiber-optic cable is used in backbone networks, cable TV networks, and Fast Ethernet networks.
* Unguided media (usually air) transport electromagnetic waves without the use of a physical conductor.
* Wireless data is transmitted through ground propagation, sky propagation, and line-of-sight propagation.
* Wireless data can be classifed as radio waves, microwaves, or infrared waves.
* Radio waves are omnidirectional. The radio wave band is under government regulation.
* Microwaves are unidirectional; propagation is line of sight. Microwaves are used for cellular phone, satellite, and wireless LAN communications.
* The parabolic dish antenna and the horn antenna are used for transmission and reception of microwaves.
* Infrared waves are used for short-range communications such as those between a PC and a peripheral device.
__________________

Reply With Quote
Reply

Tags
media, transmission


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Analog Transmission bonfire Data Communication 0 18-03-2011 06:26 PM
Digital Transmission bonfire Data Communication 0 18-03-2011 06:24 PM
Chapter # 7 (Transmission Media) bonfire Digital Switching 0 19-12-2010 03:17 AM
Chapter # 4 (Digital Transmission) bonfire Digital Switching 0 13-11-2010 07:41 PM
Chapter # 5 (Analog Transmission) bonfire Digital Switching 0 02-11-2010 08:05 PM

Best view in Firefox
Almuslimeen.info | BZU Multan | Dedicated server hosting
Note: All trademarks and copyrights held by respective owners. We will take action against any copyright violation if it is proved to us.

All times are GMT +5. The time now is 11:40 PM.
Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.