Answer to Question #210826 in Computer Networks for Laurent DARRICAU

Question

• What are the various problems that could arise in Non-Return to Zero (NRZ) encoding if a continuous stream of 0s or 1s is sent?

 Instead of writing an essay, try writing in bulleted form, briefly explaining what you understand from the findings.

Note any areas where you may want or need some further explanation. Ask questions of your fellow classmates. Revisit the Discussion Forum often, responding to at least three other classmates and responding to anyone who responded to your original post.

Answer 1

A Non-return to zero (NRZ) is an encoding formats that is used in

digital signals, that is commonly used in a slow speed

communication interface that involves both the synchronous and

the asynchronous transmission. When using NRZ, the process

involves logic 1 bit being transmit as a high value, and logic 0 bit

being transmit as a low value. The signal value is always positive

or negative.

Problem arises while using Non-Return to Zero (NRZ) to encode

a synchronous link that

-It may contain long runs of consecutive bits

that has the same value or when the data have a long stream of

0s or 1sa sequence of several consecutive 1s means that the signal stays high on the link for an extended period of time; similarly, several consecutive 0s means that the signal stays low for a long time. There are two fundamental problems caused by long strings of 1s or 0s.

NRZ codes are string of 0’s or 1’s would prevent transmitter clock synchronization along with the receiver clock. Moreover, a separate clock line has to be provided.