1. A communications channel has a bandwidth of 4,000 Hz and a signal-to-noise-ra
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Question
1. A communications channel has a bandwidth of 4,000 Hz and a signal-to-noise-ratio (SNR) of 30 dB. What is the maximum possible data rate?
2.In a CAN bus, there are three computers: Computer A, Computer B, and Computer C. The messages being sent are 2 milliseconds long. Computer A starts sending a message on the bus; 250 microseconds later, Computer B starts to send a message, and 250 microseconds after that, Computer C starts to send a message. When does Computer A retransmit its message?
3.
4. What is the difference between the bit rate and the baud rate?
On a CAN bus, one node transmits a bit with CANL of 4.4 V and a CANH of 0.5 V. Which one of the following statements is true?Explanation / Answer
1)
C= B log2 (1 + S/N) = 4*10^3*log2 (1+1000) = 4*10^3*3.32*3.0 = 39.8 kbits/s
2)
2ms -250us = 1.75 ms
it retransmit message after 1,75 ms
3)
The bit will be overridden by a bit in the dominant state.v
4)
bitrate:-
In telecommunications and computing, bitrate (sometimes written bit rate, data rate or as a variable R or fb) is the number of bits that are conveyed or processed per unit of time.
The bit rate is quantified using the bits per second (bit/s or bps) unit, often in conjunction with an SI prefix such as kilo- (kbit/s or kbps), mega- (Mbit/s or Mbps), giga- (Gbit/s or Gbps) or tera- (Tbit/s or Tbps). Note that, unlike most computer-related units, 1 kbit/s is defined as 1,000 bit/s, not 1,024 bit/s, etc.
baud rate:-
In digital communications, symbol rate, also known as baud or modulation rate; is the number of symbol changes (signalling events) made to the transmission medium per second using a digitally modulated signal or a line code. The Symbol rate is measured in baud (Bd) or symbols/second. In the case of a line code, the symbol rate is the pulse rate in pulses/second. Each symbol can represent or convey one or several bit of data. The symbol rate is related to but should not be confused with gross bitrateexpressed in bit/s.
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