A
non-return-to-zero (NRZ) is a binary code which is used in
communications. It is commonly applied for both synchronous and
asynchronous of data transferring. These transmissions are slow speed
communications interfaces.
As
defined by Rouse (2011) that NRZ has two numeral codes of one (1) and
zero (0). The data are transformed in these binary codes, then
transmitted through Direct Current (DC) voltage.
One
(1) usually represents a positive voltage or at least a zero value of
voltage, called as high state logic of NRZ. While zero (0) usually
represents a negative voltage or lower value of positive voltage, but
no neutral value of voltage. Zero binary also called as lower state
logic of NRZ.
Example
values of binary that relevant to voltages are:
Logic
0 = -7 volts ---
a negative voltage
Logic
1 = +7 volts ---
a positive voltage
Logic
0 = 0.7 volts ---
a lower value of positive voltage
Logic
1 = 0.0 volts ---
a
zero value of voltage
Now,
we have a 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? “
First,
it will create a problem on the receiver end. Second, we have
difficulty to calculate the number of 0s or 1s in the sequences.
There could potentially be thousands of 1's or 0's in sequence. Thus,
these two problems generate a lack of transition.
Then,
as said by Sanghi (2017) that these problems occur because “the
clock synchronization is lost due to lack of any transitions.” To
avoid the problems, “Non Return to Zero(NRZ) NRZ codes should share
the property that voltage level is constant during a bit interval.
High level voltage = bit 1 and Low level voltage = bit 0.”
References
Rouse,
M. 2011. NRZ (non-return-to-zero). Retrieved from
http://whatis.techtarget.com/definition/NRZ-non-return-to-zero
Sanghi,
D. 2017. Data Encoding. Computer Networks (CS425). Retrieved from
https://www.cse.iitk.ac.in/users/dheeraj/cs425/lec03.html
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A binary Code which is Used in Communications
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A non-return-to-zero (NRZ) is a binary code which is used in communications.
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It is commonly applied for both synchronous and asynchronous of data transferring.
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These transmissions are slow speed communications interfaces.
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A binary Code which is Used in Communications
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As defined by Rouse (2011) that NRZ has two numeral codes of one (1) and zero (0).