Communication Systems
enables people to send and recieve data and info. - (correct Answer) - What do communication systems
do?
Telephone,radio and television - (correct Answer) - Examples of communication Systems
1. Data Source 2. Transmitter 3. Transmitter Medium 4. Receiver 5. Destination - (correct Answer) -
Components of communication system
Produces the data to be sent - (correct Answer) - Data source
encodes the data into a signal suitable for a transmission medium - (correct Answer) - Transmitter
Channel, such as cable in which the signals are transmitted to destination. - (correct Answer) -
Transmission Medium
Decodes the signal back into the origina; data - (correct Answer) - Reciever
Reciever of the Information - (correct Answer) - Destination
See page 76 - (correct Answer) - How is ATM a communication System?
Accurate, reliable, and secure transmission mediums - (correct Answer) - What are 'good'
communication systems?
1. Protocol 2. Handshaking 3. Speed Of Transmission + 4. Error Checking - (correct Answer) - What factors
do good commun. depend on?
Set of rules that governs the transfer of data between computers - (correct Answer) - Protocol
defines how info. is transmitted and how errors are detected - (correct Answer) - How 'protocol' works?
Otherwise, data transfer may be unsuccessful - (correct Answer) - Why 2 computers must use the same
protocol?
An internationally accepted standard to which protocols are written into. - (correct Answer) - OSI
reference model
divides data commun. into 7 layers.Each layer expresses standard [which uses a protocol].Bottom layer=
transfer of data 4m one place 2 another.[type of plug,the format of data,the method of transmission and
error checking.].Top Layer= Examines exchange of data bet. application programs.[Include prtcls that
specify file transfer,passwords +network management. - (correct Answer) - Describe OSI reference model
Only handshaking makes it possible - (correct Answer) - How is data successfully transferred between
devices?
An agreement made about which protocol to use in order for exchange of info to occur - (correct
Answer) - Handshaking
, A series of signals that flow between devices during data transmission - (correct Answer) - What does
handshaking involve?
To indicate the type of protocol to be used - (correct Answer) - Why handshaking process sends signals?
When two comp. handshake successfully. indicate da type of protocol - (correct Answer) - When is a
connection between two computers made?
Uses cables, such as wires. This is for devices which are closely linked to a cable. - (correct Answer) -
Hardware Flow Control
Uses a special code sent with a data. Used for long distant communi. - (correct Answer) - Software Flow
Control
Via transmitting device + bandwidth - (correct Answer) - How is the Speed of transmission determined?
Fibre-optic cable- when cable television is transmitted thru fibre-optic cable, many diff. channels cn be
tranmistted at the same time. - (correct Answer) - Give an example of a high ranged bandwidth .
1. Bits per second 2. Baud Rate - (correct Answer) - How is the speed of data transmission measured?
Max. number of bits that can be transmitted in 1 sec. Includes special bits used in asynchronous
transmission + any error checking bits. BPS also called ' bit rate' - (correct Answer) - 'Bits per second'
Max. number of data symbols/signals transmitted in 1 sec. - (correct Answer) - Baud rate
Baud rate transmits data symbols in sec. A data symbol may contain more then one bit. - (correct
Answer) - Why are ' baud rate' + ' bps' dissimilar?
1. Errors in encoding and decoding data. 2. Interference with signals - (correct Answer) - What causes
errors when data arrives at its destination?
Error first must be detected and then corrected - (correct Answer) - So how could error in data
transmission be solved?
1. Parity Checking 2. Checksum 3. Cyclic Redundancy Check - (correct Answer) - What are the common
methods for error detection?
Uses an additional bit called a 'parity bit' to check for errors. This depends on the type of parity
[even/odd] chosen and selection of the end bits is chosen accord.see pg 78 - (correct Answer) - Identify
'Parity Checking' + Desc.
to ensure that the bits being tranmitted have actually arrived successfully - (correct Answer) - What is
the purpose of the 'additional bit' in parity checking.
It check for errors by adding the number of bits in a data packet.The sum of the data bits in a data packet
is attached to the data packet. If the same answer is produced within the reci. device then there is no
error - (correct Answer) - 'Checksum'
By dividing the total data into smaller groups. - (correct Answer) - How is the data packet in checksum
method created.
enables people to send and recieve data and info. - (correct Answer) - What do communication systems
do?
Telephone,radio and television - (correct Answer) - Examples of communication Systems
1. Data Source 2. Transmitter 3. Transmitter Medium 4. Receiver 5. Destination - (correct Answer) -
Components of communication system
Produces the data to be sent - (correct Answer) - Data source
encodes the data into a signal suitable for a transmission medium - (correct Answer) - Transmitter
Channel, such as cable in which the signals are transmitted to destination. - (correct Answer) -
Transmission Medium
Decodes the signal back into the origina; data - (correct Answer) - Reciever
Reciever of the Information - (correct Answer) - Destination
See page 76 - (correct Answer) - How is ATM a communication System?
Accurate, reliable, and secure transmission mediums - (correct Answer) - What are 'good'
communication systems?
1. Protocol 2. Handshaking 3. Speed Of Transmission + 4. Error Checking - (correct Answer) - What factors
do good commun. depend on?
Set of rules that governs the transfer of data between computers - (correct Answer) - Protocol
defines how info. is transmitted and how errors are detected - (correct Answer) - How 'protocol' works?
Otherwise, data transfer may be unsuccessful - (correct Answer) - Why 2 computers must use the same
protocol?
An internationally accepted standard to which protocols are written into. - (correct Answer) - OSI
reference model
divides data commun. into 7 layers.Each layer expresses standard [which uses a protocol].Bottom layer=
transfer of data 4m one place 2 another.[type of plug,the format of data,the method of transmission and
error checking.].Top Layer= Examines exchange of data bet. application programs.[Include prtcls that
specify file transfer,passwords +network management. - (correct Answer) - Describe OSI reference model
Only handshaking makes it possible - (correct Answer) - How is data successfully transferred between
devices?
An agreement made about which protocol to use in order for exchange of info to occur - (correct
Answer) - Handshaking
, A series of signals that flow between devices during data transmission - (correct Answer) - What does
handshaking involve?
To indicate the type of protocol to be used - (correct Answer) - Why handshaking process sends signals?
When two comp. handshake successfully. indicate da type of protocol - (correct Answer) - When is a
connection between two computers made?
Uses cables, such as wires. This is for devices which are closely linked to a cable. - (correct Answer) -
Hardware Flow Control
Uses a special code sent with a data. Used for long distant communi. - (correct Answer) - Software Flow
Control
Via transmitting device + bandwidth - (correct Answer) - How is the Speed of transmission determined?
Fibre-optic cable- when cable television is transmitted thru fibre-optic cable, many diff. channels cn be
tranmistted at the same time. - (correct Answer) - Give an example of a high ranged bandwidth .
1. Bits per second 2. Baud Rate - (correct Answer) - How is the speed of data transmission measured?
Max. number of bits that can be transmitted in 1 sec. Includes special bits used in asynchronous
transmission + any error checking bits. BPS also called ' bit rate' - (correct Answer) - 'Bits per second'
Max. number of data symbols/signals transmitted in 1 sec. - (correct Answer) - Baud rate
Baud rate transmits data symbols in sec. A data symbol may contain more then one bit. - (correct
Answer) - Why are ' baud rate' + ' bps' dissimilar?
1. Errors in encoding and decoding data. 2. Interference with signals - (correct Answer) - What causes
errors when data arrives at its destination?
Error first must be detected and then corrected - (correct Answer) - So how could error in data
transmission be solved?
1. Parity Checking 2. Checksum 3. Cyclic Redundancy Check - (correct Answer) - What are the common
methods for error detection?
Uses an additional bit called a 'parity bit' to check for errors. This depends on the type of parity
[even/odd] chosen and selection of the end bits is chosen accord.see pg 78 - (correct Answer) - Identify
'Parity Checking' + Desc.
to ensure that the bits being tranmitted have actually arrived successfully - (correct Answer) - What is
the purpose of the 'additional bit' in parity checking.
It check for errors by adding the number of bits in a data packet.The sum of the data bits in a data packet
is attached to the data packet. If the same answer is produced within the reci. device then there is no
error - (correct Answer) - 'Checksum'
By dividing the total data into smaller groups. - (correct Answer) - How is the data packet in checksum
method created.
