FLOW & ERROR CONTROL OF DCN

FLOW & ERROR CONTROL OF DCN

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Sunday, June 9, 2013 By Unknown

FLOW & ERROR CONTROL

THERE ARE TWO TYPE OF ERROR CONTROL.

1:-NOISELESS

2:- NOISY

  Noiseless has two type  ! simple protocol and stop and wait protocol

• SIMPLE protocol 

                  the speed of recevier should become itni that he get the information of  sender is simple protocol

• STOP & WAIt 

               sender send the information at that time when he shore that the first info  which he send has been recive by recevier
  
Noisy also has more two type

• stop & wait ARQ

• Goback n ARQ 

• selective repeate ARQ

 If data frames arrive at the receiver site faster than they can be processed, the frames must be stored until their use. Normally, the receiver does not have enough storage space, especially if it is receiving data from many sources. This may result in either the discarding of frames or denial of service. To prevent the receiver from becoming overwhelmed with frames, we somehow need to tell the sender to slow down. There must be feedback from the receiver to the sender.
The protocol we discuss now is called the Stop-and-Wait Protocol because the sender sends one frame, stops until it receives confirmation from the receiver (okay to go ahead), and then sends the next frame. We still have unidirectional communication for data frames, but auxiliary ACK frames (simple tokens of acknowledgment) travel from the other direction. We add flow control to our previous protocol.

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