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Chapter 8 New - CSC 311 Chapter Eight FLOW CONTROL...

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CSC 311 Chapter Eight FLOW CONTROL TECHNIQUES
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CSC 311 Chapter Eight How do we manage the large amount of data on the network? How do we react to a damaged transmission? How do we ensure that messages are correctly delivered? How can we transmit multiple frames efficiently? How can we reconcile computers that operate at dramatically different speeds? These are issues that relate to error control and flow control. We have previously examined how to detect errors, how do we handle the errors that we detect? How do we prevent devices from being overwhelmed with data?
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CSC 311 Chapter Eight We have learned how to detect errors, what action should we take to correct errors? One common technique is to request a retransmission of lost or damaged frames. There are a number of protocols that operate in this fashion, generally called “automatic repeat request” of ARQ. ERROR CONTROL
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CSC 311 Chapter Eight FLOW CONTROL Flow control defines the way in which many frames are sent and tracked and how the stations do error control. There are a number of different flow control protocols ranging from simple to complex. Simple techniques might involve sending a single frame at a time or no flow control at all, unrestricted. .send all frames whenever you wish. More complicated protocols try to strike a balance between unrestricted and overly restricted.
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CSC 311 Chapter Eight Basic Flow Control …. Signaling Sender sends data as long as receiver is able to receive it. Sender will send until receiver says stop and will not start again, until notified by receiver that it is OK to do so.
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CSC 311 Chapter Eight X-ON/ X-OFF Rather than use separate lines to signal, the signals can be embedded in the data. The figure shown below assumes full duplex communication which means there is no distinction between a sender and a receiver. In this instance, A is becoming overloaded with data from B, B is not
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Chapter 8 New - CSC 311 Chapter Eight FLOW CONTROL...

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