The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver A) can send or receive data one at a time B) can receive and send data simultaneously C) can do one way data transmission only D) cannot talk at once

The term 'duplex' refers to the ability of the data receiving stations to echo back a confirming message to the sender. In full duplex data transmission, both the sender and the receiver A) can send or receive data one at a time B) can receive and send data simultaneously C) can do one way data transmission only D) cannot talk at once

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter8: Data And Network Communication Technology

Section: Chapter Questions

Problem 38VE

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The Modem is the most well-known kind of Data Communication Equipment. It modulates an analog carrier signal in order to encode digital information, and it also demodulates such a carrier signal in order to decode the information that has been sent. To do this, a signal must be created that can be readily transferred and decoded in order to replicate the original digital data. Provide a brief explanation of how the modem accomplishes these objectives.
What causes asynchronous transmission to have a non-constant duration between bytes?
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Suppose that a binary message – either 0 or 1 – must be transmitted by wire from location Ato location B. However, the data sent over the wire are subject to a channel noise disturbance,so to reduce the possibility of error, the value 2 is sent over the wire when the message is1, and the value −2 is sent when the message is 0. If X, X = {−2,2}, is the value sent atlocation A, the value received at location B, denoted as R, is given byR = X + N ,where N is the channel noise disturbance, which is independent of X. When the message isreceived at location B, the receiver decodes it according to the following rule:if R ≥.5, then conclude that message 1 was sentif R < .5, then conclude that message 0 was sentAssuming that the channel noise, N, is a unit normal random variable and that the message0 or 1 is sent with equal probability, what is the probability that we conclude that the wrongmessage was sent? This is the probability of error for this communication channel
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The reason for the varying duration between bytes in asynchronous transmission.
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