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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

 

 

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Replies to This Discussion

and how to do Q2.

or divide 1000 se kre ge ya 1024 se 

AUR SATH oyerhead bhi add krna hoga ti ke sath 08 aur t2 ke sath 168.

khichri paki hoe hia

jin ko pehly ki smjh a gae hy wo mujy bhe smjha dain

jo main ne solve kia h  wo to dfrnt h is se :(

No. of Voice Channels

Data Rate in Mbps

Type of T/E line used

Total No. of T/E lines

50

50*64/1024=3.125

T-1

2 line of T-1

90

90*64/1024=5.625

T-1

3 line of T-1

140

140*64/1024=8.75

E-2

1 line of E-2

195

195*64/1024=12.1875

T-1 , E-1 , E-2

1 line of each (T-1 , E-1 , E-2)

600

600*64/1024=37.5

T-1 , E-3

1 line of each (T-1 , E-3)

hum ne to T lines ko DS ke corresponding lena hai na DS-1 ke liye T1 ya E1 and soo on ds-4 ke liye T4 and E4.... then aap ne asa kyse kiya??? will you explain...

 

RIDA BIBI hum nay hasil karda data rate k against line used karni hai. aur tariq bhai according to handouts agar hum 1000 sy divide karain too

90 * 64kbps = 5760kbps/1000 = 5.76mbps(data rate)  and 2 E1 lines and ! T1 line= 5.64mps and data loss is very minor i think ya appropriate ans ho ga what you say????

ya jo lectures main DS0 k lea 8kbps overhead and DS1 k lea 168kbps overhead ans so forth jo deye gaye hain ya nai add karny ki idhar???? i means handout main solution kuch is tarha hai

 24 * 64 + 8kbps overhead = 1.544 mbps

 explain plejjjjj

No. of Voice Channels

Data Rate in Mbps

Type of T/E line used

Total No. of T/E lines

50

50*64/1000= 3.2

 

 

90

90*64/1000= 5.76

 

 

140

140*64/1000= 8.96

 

 

195

195*64/1000= 12.48

 

 

600

600*64/1000= 38.4

 

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