UGC NET CSE | June 2013 | Part 3 | Question: 22

Question

What is the baud rate of standard 10 Mbps Ethernet?

• A. 10 megabaud
• B. 20 megabaud
• C. 30 megabaud
• D. 40 megabaud

Answer 1

Answer : B

Baud Rate = 2*Bit Rate

Baud Rate  = 2*10 =>20 megabaud

Comments

Link 1.

The baud rate is the rate of signal change on the medium (usually expressed as a worst-case value). Since 10 Mb/s Ethernet uses one transition (per bit) for the clock, and a second transition for data(in the worst-case), it has a baud rate of 20 Mbaud.

Link 2.

However, using baud to measure Ethernet communication is not the best
way of doing things, because it forces us to consider the physical
layer, rather than the actual implementation's speed - which is why
most people refer to Ethernet speed in bits per second, or degrees
thereof.

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can you relate with this formula?

Bit rate = baud rate * no of bits in a baud

so, baud rate = bit rate / no of bits in a baud

how many no of bits in a baud here?

Note : The Ethernet uses Manchester encoding, which means it has two signal periods per bit sent

Answer 2

The Ethernet uses Manchester encoding, which means it has two signal periods
 
per bit sent.The data rate of the standard Ethernet is 100-Mbps, 

so the baud rate is 200 Mbaud.

Hence,Option(B)20 Megabaud.