4.In SS7 signaling backward error correction is deployed. Explain the difference between basic method and preventive cycle retransmission of error correction. Clearly explain the sequence control field.
a. Geographical location of the customer
b. Access network
c. Local switch/s
d. Domestic Transport Network
5. In the basic method of error correction station A is sending 5 messages to station B.Draw the signaling diagram that you may observe from station A to station B to show the above transaction. Clearly explain the sequence control field.
e. International Gateway
g. Other country’s Domestic Transport Network
1.3 In practice, non-linear quantizing is deployed as against linear quantizing, explain the reasons behind. 256 levels are used for non-linear quantizing and there are 8 segments each positive and negative sample. Explain the basic characteristics of non-linear quantizing used for European system (the A-law signal compression of 13 linear segments)
1.4Each quantized level will be converted to binary before transporting the quantized level (related to the sample) into the transmission media. Assuming a telephone will generate a maximum of +3072 mV calculate the encoded format that will be sent in the transmission media for the following sample values. i. + 2210mV ii. + 128mV iii. – 14mV iv. –416mV
2.1.Time Division Multiplexing (TDM) is deployed in the PCM system in order to maximize the utilization of the transmission media. Explain briefly the TDM systems deployed in the Europe and America / Japan.
2.1Explain the basic elements of a fixed telephone network.
2.2.In practice, non-linear quantizing is deployed as against linear quantizing, explain the reasons behind.
2.3. 256 levels are used for non-linear quantizing and there are 8 segments for each positive and negative sample. Explain the basic characteristics of non-linear quantizing used for European system (the A-law signal compression of 13 linear segments)
3.1 .Draw a block diagram of PCM clearly explaining how a basic frame structure is achieved in each block.
3.2. A PCM system will comprise of sampling, quantizing and encoding. Explain each block. clearly.
3.3 Three consecutive voice samples in a 30 channel PCM system are identified as follows. +50V, 0V, -68V Draw the wave forms that you can observe in the transmission media, assuming HDB3 transcoding. (Assuming A-Law compression for non-linear quantizing)
4.2 What are the applications of TS0 and TS16 in the PCM frame.
4.3 .Briefly explain why higher order multiplexing is necessary in telecommunication.In SMW4 submarine cable system, STM-64 is used which is equivalent to 10Gbit/s. Briefly Explain how a bit in a sample is multiplexed and de-multiplexed if used SMW4
5. .Digital transmission is essential in today’s telecommunication as it is the most efficient way of reproducing the transmitted signal at the receiving end.” Explain the above statement with reference to different stages in digital transmission.
Assuming that there are no customers connected at Ratmalana Master exchange, what is the maximum traffic that the Master exchange can handle. (Assume no other connections from Master exchange to other exchanges and this will work as a closed Switching network.)
6.1 Clearly explain the difference between PDH and SDH multiplexing methods.
7.1 STM-1 Frame structure is defined by 9x270 Matrix, each point of the Matrix is a byte (8 bits).Show that STM-1 will carry 155.52 Mbps.
7.2 The following shows the STM-1 frame. Explain the importance of each area shown.