.3.Why is there no need for CSMA/CD on a fill-duplex Ethemet LAN? Q.4.What are t
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Question
.3.Why is there no need for CSMA/CD on a fill-duplex Ethemet LAN? Q.4.What are the common Gigabit Ethernet implementations? Problems Q.5. Calculate the minimum time required to download one million bytes of information using each of the following technologies (consider the minimum rates) a. ADSL b. ADSL Lite c. HDSL d. SDSL e. VDSI Q.6. What type of topology is used when customers in an area use cable modems for da transfer purposes? Explain 3, 8B/6TBlock Encoder in Gigabit Ethernet. 07. Explain 4 ID-PAM5 encoder in 10 Gigabit Ethemet.Explanation / Answer
Basics:
bits - used to Measure Speed.
Bytes - used to Measure Size.
1 Bit - Smallest unit of information.(may be 1 or 0)
8 Bits = 1 Byte.
While calculating download time make sure to convert bits to bytes.
Time required to download a File = File size / Download Speed.
File Size = 1 MB (1 million bytes)
a)ADSL - Asymmetric digital subscriber line
Min Download Speed = 8 Mbps
To convert this to bytes divide by 8. So Min Speed = 1 MBps
Download Time = File size / Download Speed
= 1MB / 1 MBps
= 1 sec
b) ADSL lite
Min Download Speed = 1.5Mbps
To convert this to bytes divide by 8. So Min Speed = 0.187 MBps
Download Time = File size / Download Speed
= 1MB / 0.187 MBps
= 5.347 secs
c) HDSL - High-bit-rate digital subscriber line
Min Download Speed = 1.54Mbps
To convert this to bytes divide by 8. So Min Speed = 0.192 MBps
Download Time = File size / Download Speed
= 1MB / 0.192 MBps
= 5.208 secs
d) SDSL - Symmetric Digital Subscriber Line
Min Download Speed = 0.16 Mbps
To convert this to bytes divide by 8. So Min Speed = 0.02 MBps
Download Time = File size / Download Speed
= 1MB / 0.02 MBps
= 50 secs
e) VDSL - Very-high-bit-rate digital subscriber line
Min Download Speed = 51 Mbps
To convert this to bytes divide by 8. So Min Speed = 6.375 MBps
Download Time = File size / Download Speed
= 1MB / 0.187 MBps
= 0.156 secs
Note:
As no download speeds are given I have used the typicals values found on the internet.
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