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Category > Computer Science Posted 06 Nov 2017 My Price 10.00

Calculate the efficiency of transmission to transmit:

Help on description of Final Exam, comparison

 

TLMN641 - FINAL EXAM

 

1. (4 points) Calculate the efficiency of transmission to transmit:

a.       An Ethernet packet of 1,500 bytes (including the overhead with 6-byte addresses)

b.      An equivalent data using ATM cells

 

2. (4 points) Shannon’s channel capacity theorem provides the following relationship for maximum channel capacity (bits per second) in terms of bandwidth B and signal-to-noise ratio S/N.

C = B log2 (1+S/N)

The S/N in decibels (dB) is related to S/N in power ratio by

S/N in dB = 10(log10S/N)

The transmission operations system monitors S/N of a telephone channel with a 3-kHz bandwidth and a channel capacity of 30 kbps. When S/N decreases by 3 dB, the operations system issues a warning alarm and the telephone trunk facility is taken out of service if S/N goes down by 6 dB. Calculate the channel capacity in bps at (a) warning threshold and (b) out-of-service limit keeping the same 3-kHz bandwidth for the telephone channel.

 

 

3. (4 points) You are the manager of a NOC. Set up a procedure that would help your operators track the failure of a workstation that is on a virtual LAN.

 

 

4. (4 points) Telephone service providers are now offering ADSL service to home using the existing twisted-pair telephone wires. The signal can be carried up to a maximum of 1-MHz baseband with an S/N (signal power/noise power in ratio) of 30 dB. S/N in decibels (dB) is defined as 10 log10(signal power/noise power). Using MPEG-2 compression techniques, (a) a non-sports video channel can be broadcast at 3-Mbps data rate and (b) a sports video channel at 6 Mbps. Shannon’s limitation for information capacity for a channel is given by

Maximum bit rate (bits/sec) = B log2(1+S/N),

where S/N is in ratio (and not in dB) and B is the bandwidth. How many video channels can simultaneously be transmitted over the line for the two cases?

 

 

 

5. (4 points)

 

a. What MIB table would you use to measure the QoS of service flow in a fixed wireless system between the base station and the subscriber station?

 

b. Define latency and jitter for service flow in a fixed wireless system.

 

c. Write the specific managed objects associated with latency and jitter.

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SophiaPretty
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Status NEW Posted 06 Nov 2017 01:11 PM My Price 10.00

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