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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.


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






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
























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]






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Replies to This Discussion

Helping Material about this assignment is in Lecture No 31 to 33

Naeem tahir Thanks for sharing 



1/24 of T-1

1 Channel



1 T-1

24 Channels


3.152 Mbps

2 T-1

48 Channels


6.312 Mbps

4 T-1

96 Channels


44.736 Mbps

28 T-1

672 Channels


89.472 Mbps

56 T-1

1344 Channels


274.176 Mbps

168 T-1

4032 Channels

handout may to DS1 ke liye T1 and DS 2 ke liye T2 hai and so on DS4 ke liye T4 then aap ne sirf T1 kyun use kiya plz explain...


Please Discuss here about this assignment.Thanks

Our main purpose here discussion not just Solution

All students must share points and also your problems.... so it can discussed and solution can prepare.

Don’t wait for solutions just participate in Discussions because after discussions a correct solution will prepare...

Q.1 Solution 

Solve the remaining column by your self

No. of Voice Channels

Data Rate in Mbps

Type of T/E line used

Total No. of T/E lines


3.208 Mbps




5.768 Mbps




9.128 Mbps




12.648 Mbps




38.568 Mbps




Please fellow students help in solving assignment

plz T/E ko explain kr dein

Four DS1 signals combine to form a single DS2 signal. The four DS1 signals form a single DS2 M-frame, which includes subframes M1 through M4. Each subframe has six 49-bit blocks, for a total of 294 bits per subframe. The first bit in each block is a DS2 overhead (OH) bit. The remaining 48 bits are DS1 information bits.

Data rate: This is the rate, in bits per second (bps), at which data can be communicated.

Example: Consider a noiseless channel with a bandwidth of 3000 Hz transmitting a signal with two signal levels. The maximum bit rate can be calculated as




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