Assignment. 05 SEMESTERFALL 2008 CS601- Data Communication Total Marks:15 Due Da
ID: 3608043 • Letter: A
Question
Assignment. 05 SEMESTERFALL 2008 CS601- Data Communication
Total Marks:15
Due Date:22/01/2009
Marks:15
Q# 01:-
Howcan you determine the no. of redundant bits in Hamming Code errorcorrection technique? [5].
Q # 02:- Compare line discipline methodsENQ/ACK and Poll/ Select? [5]
Q # 03: What the receiver will receive if the check summethod is applied to the following bit?
10101001 00111001[5]
Deadline
Your assignment (From Lecture # 32 to 39)must be uploaded / submitted till due date.
Assignment. 05 SEMESTERFALL 2008 CS601- Data Communication
Total Marks:15
Due Date:22/01/2009
Marks:15
Q# 01:-
Howcan you determine the no. of redundant bits in Hamming Code errorcorrection technique? [5].
Q # 02:- Compare line discipline methodsENQ/ACK and Poll/ Select? [5]
Q # 03: What the receiver will receive if the check summethod is applied to the following bit?
10101001 00111001[5]
Deadline
Your assignment (From Lecture # 32 to 39)must be uploaded / submitted till due date.
Explanation / Answer
1.Error Correction:
Use of simple parity allows detectionof single=bit errors in a received message. Correction of theseerrors requires more information, since the position of thecorrupted bit must be identified if it is to becorrected.(If a corrupted bit can be detected, it can becorrected by simply complementing its value). Correction is notpossible with one parity bit since any bit error in any positionproduces exactly the same information, i.e., error.
2.ENQ/ACK:
– ENQ/ACK coordinates which device may start a transmission andwhether or not the intended recipient is ready and enabled. See fig10.4
– Using ENQ/ACK,a session can be initiated by either station on a link as long asboth are of equal rank.
– In bothhalf-duplex and full-duplex transmission, the initiating deviceestablishes the session.
– In halfduplex, the initiator then sends its data while the responderwaits. The responder may take over the link when the initiator isfinished or has requested a response.
• Thepoll/select method of line discipline works with topologies whereone device is designated as a primary station and the other devicesare secondary stations.
• Multipoint systems must coordinate several nodes, not just two.
• Thequestion to be determined in these cases, therefore, is more thanjust, are you ready? It is also, which of the several nodes has theright to use the channel?
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