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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:

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

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### Replies to This Discussion

asif sahib yeah taheek ha na upload ker dain

very thx Asif Bhai MCS for improving the assignment

plz tel me how u find T /E lines are using?And how calculate data rate .what overhead is also added ?plzzzzzzzzzzzzz explain

very good

thank u so much Asif. abhi work itna tha k is assignment par kam krna bht mushkil hota.

Thank you Bro.
I just want take the concept how did you Draw the Division. and seen from your document but i didn't copied.

Once Again Thanx Brother.

nice...correct...and thanksss....

maximum possible data rate on a communication channel
data rate - in bits per second
bandwidth - in cycles per second or Hertz
error rate - of corrupted bits
 New Announcement Instruction about Assignment No.4 Dated: Jan 24, 13 Dear Students,  In assignment no. 4, while selecting T or E lines, there is no need to include any overhead in the table although we have used it in handouts but you are not required to include it.  You are just required to select T or E lines on the basis of calculated data rate (without including overhead).   Regards

CS601 4th Assignment solution Due Date: 29-01-2013

CS601 4th Assignment solution Due Date: 29-01-2013

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:
Calculate the corresponding data rate against each number of given voice channels.
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]

solution

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]

data rate find kerny k steps kya hongy?

Steps for Data Rate Calculation:

1. One voice channel data rate is 64kbps.
2. so if we have 50 channels like in assignment then 50x64 kbps=3200kbps
3. we need date rate in Mbps so 3200kbps/1000= 3.2Mbps

So in this way you can calculate Data Rates.

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