case24soln

case24soln - is again acceptable. d. Would a cellular...

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ESD264/1.264 Lecture 24 case study Fall, 2006 Communications in a warehouse The warehouse has decided to scan its inventory using moving RFID readers that sweep every bin and shelf in the warehouse every 15 minutes. The readers move on tracks along the shelves and bins. There are approximately 100,000 items of inventory at the warehouse. The sweep takes one minute to complete, so the data is bursty. The data is sent as it is read. a. If each RFID tag transmits 256 bits of information, and if each tag is read four times per sweep (either by different readers or multiple times by the same reader), what is the total bandwidth (bits/second) required to transmit all data from the warehouse to a server at company headquarters, located 3 km away? 100 000 items * 4 (reads/item) * 256 (bits/item) = 102 400 000 bits per sweep. Divide by 60 seconds, to yield about 2 000 000 bits per second, or 2 Mbps b. Would a 10Mbps Ethernet LAN connection work? Why or why not? No. The distance is too great for a LAN, which is limited to 2km. The bandwidth is sufficient: a 2Mbps traffic load on a 10Mbps Ethernet link is acceptable. 20% utilization on Ethernet will give good service. c. Would a 100Mbps Ethernet connection work? Why or why not? If there is more than one reason, give all reasons. No. The distance is too great. The bandwidth
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Unformatted text preview: is again acceptable. d. Would a cellular (wireless) GPRS data link operating at 500kbps work? Why or why not? No. The bandwidth is too low. The range is sufficient; the cellular carrier will carry the traffic across more than one cell if needed. e. Would a 10Mbps Ethernet LAN be sufficient to link all the RFID readers in the warehouse to a communications server in the warehouse, which then sent all traffic over a network link (possibly using a different technology) to the headquarters? Yes. The bandwidth is sufficient, and a LAN can cover a warehouse within its maximum range. f. If there are any unresolved communications issues after answering the questions above, how would you resolve them? Communications from the warehouse to the corporate office must be handled by a MAN technology; Ethernet is almost certainly the best choice....
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case24soln - is again acceptable. d. Would a cellular...

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