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level: Communication methods (NEED)

Questions and Answers List

level questions: Communication methods (NEED)

QuestionAnswer
What are the two types of cables called?Paralle Serial
Give the definition for baud ratethe rate at which the signal changes
In what way would you say bits are sent along a serial cable?One after the other Asynchronous
Whats faster serial or parallel data transmission?Parallel
What are some of the issues with parallel transmissionVery short range (2-3 m) Reliability Crosstalk Skewage
Is a USB connector cheaper than a parallel connector?Yes
What is the smaller connector: parallel or serial?Serial
Define Synchronous transmissionAll data transmission are in time with the clock
State what asynchronous transmission isTransmission in which each BYTE is sent seperatly the moment it is needed
What transmission type sends using a stop bit and a start bit when transmitting dataAsynchronous
What is parity checking?Checking the number of 1s at the start matches the number of 1s at the end
How is parity checking used in either form of transmitting dataSetting the 8th bit as the parity bit, this bit is either a 1 or a 0 depending in the number of 1s in the byte and if the parity is even or odd
Which type of communication is slower and why?Asynchronous Increased number of bits being sent (start and stop bit)
Which type of communication method is more expensive? And whySynchronous Synchronous requires a clock
Define latencyThe time delay between initiating a transmission and it being received
State what protocol isA set of rules
Give a definition for bit rateBits transmitted per second
Give some examples of protocols in communicationsStandards for physical connections and cabling The rate of transmission (bit rate or baud rate) Data format Whether transmission is synchronous or asynchronous Error checking procedures, e.g. odd or even parity
State the equation for bit ratebit rate = baud rate x number of bits per signal
What makes baseband transmisson baseband transmissonAt each signal change, only one bit is transmitted
Define bandwidthMeasure of maximum capactity of a given communicaiton channel
What is skewage?When signals travel at slightly differnt speeds usually due to differnt wires having differnt properties
What is crosstalk?unwanted transfer of signals between communication channels
Are the start bits 1s or 0s?Doesnt matter just as long as they are differnt
What are the difference between serial and paralle data transmsiionParalel sends multiple bits of data an once Paralel has multiple wires
State the equation for baud rateBaud rate = bit rate/ number of bits per signal
Why might serial transmission be preferred to paralleSerial requires less wires, so less cost Serial is asynchronous meaning it does not need to be set up to be in synhch, meaning less chance of errors Less risk of skewage over long distances, as serial is better over long distances and asynchronous Paralle may have crosstalk between wires as there are multiple sets of wires close together Better for long distance
Why would paralle be preffered to sreial communicationsParalle is faster than serial as it can send multiple bits at once due to multiple cables
What’s the relationship between bit rate and bandwidthLinear
Whats the relationshio between the bandwith and the volume of data able to be transferedAs bandwidth increases, violume of data increases