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(PDF) Telecommunication Systems and Data Networks

   

Added on  2021-04-22

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Running head: TELECOMMUINICATIONTelecommunicationName of the Student:Name of the University:Author Note

1TELECOMMUINICATION Answer to question number 2 a)iii)AMI coding is used for the first generation networks of PCM, and the major drawback ofthat the AMI coding holds is that the long run of 0’s provides no transition in the data stream. Itdoes not contain enough transitions so that a lock of DPLL can be guaranteed. The user has torely on the long run of 0’s that has to be sent for a successful transmission. Hence, the encodingis not transparent for the sequence of bits that are being sent.Hence the HDB3 encoding scheme is being used for the solution to this problem. It hasbeen developed irrespective of the pattern of data that is being carried. The pattern of bits " 1 0 00 0 1 1 0 " encodes to " + 0 0 0 0 - + " in AMI encoding. Whereas, in HDB3 is converted into “+0 0 0 + - +”.b)i)The constellation diagram has been produced by a v.32bis modulator. 64 PSK modulationtechnique is being used. This is a 64 point constellation used in the v.32bis modulator. With the2400 baud.ii)2^N bits can be represented.

2TELECOMMUINICATION Hence 2^N = 64. Therefore N = 6. Hence, 6 bits can be represented in a single signal in thistechnique.iii)In 2400 bauds the modem will achieve 2400x6 = 14400 bits per secondAnswer to question number 3b)i) The number of characters: 200Total number of bits for a character = 1+7+2+1 = 11 bitsTotal bits = 200 x 11 bits = 2200 bitsCommunication line = 20 x 1024 bits = 20480Therefore the rate is 22000/20480 = 1.07421875charcter/secii)Total bits = 100 x 48 bits = 4800Therefore number characters that can pass through the network at that time = 20480/4800 = 4.27Answer to question number 4a)Satellite channel = 3mbpsPropagation delay = 270mS

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