Physical media - computer network, Computer Networking

Physical Media

In order  to define what is meant by a physical medium let us reflect on the brief life of a bit. Consider  a bit travelling from one end system through a series of links and router to  another end  systems. The source end system first transmits the bit and shortly thereafter the first router in the series receive the bit the first router then transmits the  bit and shortly thereafter a second router the bit and so  on. Thus the bit when  travelling  from  sources  to destination passes  through a series of transmitter receiver pairs. For  each transmitter receiver pair the bit is sent by propagating electromagnetic waves or optical pulses  across  a physical medium.

Physical  media can be divided in to  two categories: Guided  and  unguided media guided media include twisted pair cable  coaxial  cable  and fiber optic  cable. Unguided  media is free space. Unguided media, which  are those that provide  a conduit  from one  device  to another  include  twisted pair  cable  coaxial  cable and  fiber poetic cable. A signal  travelling  along  any of these media  is directed and  contained by the physical limits  of the  medium.

Unguided Media Transport electromagnetic  waves without  using a physical  conductor. This  type of communication  is often  referred to as  wireless  communication. Signals are normally  broadcast  through  free  and thus  available  to anyone who has a device capable  of receiving  them.

 

318_Physical Media.jpg

                                                                  figure classes of transmission media

Posted Date: 3/3/2013 11:59:11 PM | Location : United States







Related Discussions:- Physical media - computer network, Assignment Help, Ask Question on Physical media - computer network, Get Answer, Expert's Help, Physical media - computer network Discussions

Write discussion on Physical media - computer network
Your posts are moderated
Related Questions
What is the difference between CSMA/CD and CSMA/CA? CSMA/CD, or Collision Detect, retransmits data frames when a collision occurred. CSMA/CA, or Collision Avoidance, will first

ICMP is used to send error and control messages. Ping uses ICMP to carry the echo-request and echo-reply.

Question 1 Explain GSM digital cellular System model Question 2 Explain cellular Digital Packet Data(CDPD) system with the help of CDPD network reference model Question 3

A logical circuit that is created by Virtual channel links. It carries data among two endpoints in a network. The one more name for Virtual Channel is Virtual Circuit.

Q. Describe about Cryptography? - Some media cannot be protected from unauthorized reception (or interception) - Encryption involves transforming the original information in

With a transaction server, the client requests remote procedures that reside on the server with an SQL database engine. These remote processes on the server execute a group of SQL

Error Detection-- CRC Powerful error detection system Rather than addition, binary division is utilized A series of redundant bits called "CRC" or else "CRC remai


Q. Show the properties of Microwaves? Microwaves - Frequencies among 1 and 300 GHz - Unidirectional - Narrow focus requires sending as well as receiving antennas to

Network Allocation Vector Timer which shows how much time must pass before a station is allowed to check the channel