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CS601 Assignment No. 4 Semester Fall 2012 Data Communication Due Date: 29-01-2013 Please share your ideas here

Assignment No. 4
Semester Fall 2012
Data Communication - CS601

 

Total Marks: 30

 

Due Date: 29-01-2013

 

Objective: Understanding the T & E lines and Error detection method.

Instructions:

Please read the following instructions carefully before solving & submitting assignment:

Assignment should be in your own wordings not copied from net, handouts or books.

It should be clear that your assignment will not get any credit (marks) if:

 

  • The assignment is submitted after due date.
  • The submitted assignment does not open or file is corrupt.
  • The assignment is copied (from other student or copied from handouts or internet).

 

For any query about the assignment, contact at cs601@vu.edu.pk

 

GOOD LUCK

 

 

 

Q. 1. Telephone Companies use a hierarchy of Digital Signals Service (DS) which have different levels as DS-0, DS-1, DS-2, DS-3 and DS-4. All these levels have different data rates and are implemented through different types of T lines (from T-1 to T-4) or E lines (from E-1 to E-4) on the basis of data rate in each level.

Now you are required to fill  the columns of the given table according to following  instructions:

  1. Calculate the corresponding data rate against each number of given voice channels.
  2. Write the best suitable type of line (form T-1 to T-4 or from E-1 to E-4 line) with total number of T or E lines corresponding to calculated data rate. [15 Marks]

 

Note: Type of line (form T-1 to T-4 or from E-1 to E-4 line) and total number of T or E lines must be selected on the basis of calculated data rate having minimum wastage of capacity of the line. Only optimal solution is required for these columns.

 

No. of Voice Channels

Data Rate in Mbps

Type of T/E line used

Total No. of T/E lines

50

 

 

 

90

 

 

 

140

 

 

 

195

 

 

 

600

 

 

 

 

 

 

Q. 2.  Using Modulo-2 Division and Polynomial x4 + x3 + x + 1, perform the complete process of Cyclic Redundancy Check (CRC) on the given message by writing all steps for both sender and receiver end.

 Assume that the message has been received by the receiver without any error. [15 Marks]

 

Message:

1010111001100010

 

 

Views: 9895

Attachments:

Replies to This Discussion

tariq bhai plz tel how we choose t or E line .& overhead also be added in data rate.plz tel

Nice and keep it up 

 Solution:

No. of Voice Channels Data Rate in Mbps Type of T/E line used Total No. of T/E lines
DS0 64Kbps 1/24 of T-1 1 Channel
DS1 1.544Mbps 1 T-1 24 Channels
DS1C 3.152 Mbps 2 T-1 48 Channels
DS2 6.312 Mbps 4 T-1 96 Channels
DS3 44.736 Mbps 28 T-1 672 Channels
DS3C 89.472 Mbps 56 T-1 1344 Channels
DS4 274.176 Mbps 168 T-1 4032 Channels

 

Q. 2.  Using Modulo-2 Division and Polynomial x4 + x3 + x + 1, perform the complete process of Cyclic Redundancy Check (CRC) on the given message by writing all steps for both sender and receiver end.

Assume that the message has been received by the receiver without any error. [15 Marks]

Message:

1010111001100010



in 2nd q remainder is 1111 .it will rejected at receiver how we make it error free at ath receiver end...

Malik bhai ye sol wrong hai

What would the solution for question # 2

Ha its total CRC checker do it (2Q)

I'm do it through it.....

Crc checker result may come zero.crc generator result is 1111what i am saying

 right?

can anyone explain it in simple wordssss .............  still data rate he clear hoa hai

message.

                                    1 1 0 1 0 0 0 1 1 0 0 0 1 1 0 1

                                   

1 1 0 1 1          1 0 1 0 1 1 1 0 0 1 1 0 0 0 1 0 1 1 1 1       

1 1 0 1 1 

                                       1 1 1 0 1

                                       1 1 0 1 1  

                                          0 1 1 0 1

                                          0 0 0 0 0  

                                             1 1 0 1 0

                                             1 1 0 1 1

                                                0 0 0 1 0

                                                0 0 0 0 0

                                                   0 0 1 0 1

                                                   0 0 0 0 0

                                                      0 1 0 1 1

                                                      0 0 0 0 0

                                                         1 0 1 1 0

                                                         1 1 0 1 1

                                                            1 1 0 1 0

                                                            1 1 0 1 1

                                                               0 0 0 1 0

                                                               0 0 0 0 0 

                                                                  0 0 1 0 1

                                                                  0 0 0 0 0   

                                                                     0 1 0 1 0

                                                                     0 0 0 0 0 

                                                                        1 0 1 0 1

                                                                        1 1 0 1 1 

                                                                           1 1 1 0 1

                                                                           1 1 0 1 1

                                                                              0 1 1 0 1

                                                                              0 0 0 0 0

                                                                                 1 1 0 1 1

                                                                                 1 1 0 1 1

                                                                                    0 0 0 0 Reminder

No. of Voice Channel

Data Rates in Mbps

Type of T/E line used

Total no. T/E line

50

50*64kbps/1024=3.125 Mbps

T-1 Line

2 line of T-1 (1.544*2=3.088Mbps) with minimum wastage of 0.037 Mbps

90

90*64kbps/1024=5.625 Mbps

T-1 Line

3 line of T-1 (1.544*3=4.632 Mbps) with minimum wastage of 0.993 Mbps

140

140*64kbps/1024=8.75 Mbps

E-2 Line

1 line of E-1 (8.44 Mbps) with minimum wastage of 0.31 Mbps

195

195*64kbps/1024=12.187 Mbps

T-1 , E-1 , E-2 Lines

1 line of Each T-1 , E-1 , E-2  (1.544+2.048+8.44=12.032 Mbps)  with minimum wastage of 0.155 Mbps

600

600*64kbps/1024=37.5 Mbps

T-1 ,E-1 , E-3 Lines

1 line of Each E-1 , E-3 (1.544+2.048+34.368=37.96

 Mbps) 

with minimum wastage of 0.46 Mbps

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