Blog: 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]

 Message:
 1010111001100010