| What are the two types of cables called? | Paralle
Serial |
| Give the definition for baud rate | the 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 transmission | Very 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 transmission | All data transmission are in time with the clock |
| State what asynchronous transmission is | Transmission 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 data | Asynchronous |
| 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 data | Setting 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 why | Synchronous
Synchronous requires a clock |
| Define latency | The time delay between initiating a transmission and it being received |
| State what protocol is | A set of rules |
| Give a definition for bit rate | Bits transmitted per second |
| Give some examples of protocols in communications | Standards 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 rate | bit rate = baud rate x number of bits per signal |
| What makes baseband transmisson baseband transmisson | At each signal change, only one bit is transmitted |
| Define bandwidth | Measure 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 transmsiion | Paralel sends multiple bits of data an once
Paralel has multiple wires |
| State the equation for baud rate | Baud rate = bit rate/ number of bits per signal |
| Why might serial transmission be preferred to paralle | Serial 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 communications | Paralle is faster than serial as it can send multiple bits at once due to multiple cables |
| What’s the relationship between bit rate and bandwidth | Linear |
| Whats the relationshio between the bandwith and the volume of data able to be transfered | As bandwidth increases, violume of data increases |
