Alpha Corp

Iv. Alpha Corp

Alpha corp. is trying to decide the size of the connection It needs to the internet. The company estimates that it will send and receive a total of about 1000 emails per hour and that each email message is about 1500bytes in size. The company also estimates that it will send and receive a total of about 3000 web pages per hour and that each page it about 40,000 bytes in size.

• 1.      Without considering transmission efficiency, how large an internet connection would you recommend in terms of bits per second (Assuming each bye is eight bits in length)?
• 2.     Assuming they use a synchronous data link layer protocol with an efficiency of about 90% how large internet connection would you recommend?
• 3.     Suppose Alpha wants to be sure that its internet connection will provide sufficient capacity the next two years. How large an internet connection would you recommend?

#s of email per hour = 1000

Size of 1 email = 1500 bytes

Size of 1000 emails = 1500*1000 = 1,500,000 bytes

1,500,000 bytes = 1,500,000 * 8 = 12,000,000 bits

#s of web pages per hour = 3000

Size of each web page = 40,000 bytes

Size of 3000 web pages = 3000 * 40,000 = 120,000,000 bytes

120,000,000 bytes = 120,000,000 * 8 = 960,000,000 bits

Alpha Corp’s hourly data transmission is = (960,000,000 + 12,000,000) bits = 972000000

• 1.     Recommended speed for Alpha Corps i.e. - 972000000/ (60 * 60)
•       = 270000 bits per second 
•         or 270 kbps

• 2.     If the Efficiency is 90%, I would recommend (0.9*270000) 
•         = 300,000 bits per second) 
•             or 300 kbps
• 3.     For 2 years = 300,000 *60*60*24*365*2 
•          = 18,921,600,000,000 bits per second
•          = 8921600000 Kbps
•         = 2.3652 * 10^12 bytes