Determine the minimum signal-to-noise

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Reference no: EM132350417

Telecommunication Network Services Assignment -

1. Determine the minimum signal-to-noise (SNR) required to achieve a transmission rate of 28 kbps over a telephone channel carrying voice signals of frequencies ranging between 30 Hz and 3.13 kHz. Express your answer in decibels (dB).

2. For the bit stream 1 1 1 0 0 1 0 0, sketch the waveforms for NRZ-L, NRZI, Manchester, and Differential Manchester encoding. For NRZI, it may be assumed that the signal level for the preceding bit was high.

3. Given generator polynomial function g(x) = x³ + x + 1, find the 7-bit codeword corresponding to the information sequence 1101. Furthermore, if this codeword is received with an error in the most significant bit (MSB), determine what the receiver will obtain when it conducts an error check on this codeword.

4. In Figure 1, frames are generated at node A and sent to node C through node B. Determine the minimum transmission rate (in bits per second) required between B and C so that buffer of B is not flooded, with the following assumptions:

Data rate between A and B is 80 kbps.
Both lines are full duplex lines having identical propagation delay of 4 μs/km.
All data frames are 800 bits; ACK frames are separate frames of negligible length.
Between A and B, a sliding-window flow protocol with a window size of 3 is used.
Between B and C, stop-and-wait flow control is used.
There are no errors.

Hint: In order not to flood the buffer of B, the average number of frames entering and leaving B must be the same over a long interval.

5. Suppose that a transmission line connecting two computers has a transmission speed of 3 Mbps, transmission bit-error-rate (BER) of 2 x 10^-5, and a one-way propagation time of 5 ms. If a frame of 1200 bytes is transmitted:

(a) Find the transmission efficiency if Stop-and-Wait ARQ is used.

(b) Repeat for Go-Back-N ARQ that uses a three-bit sequence numbering.

Assume the number of bits for header, CRC, and ACK are negligible compared to the number of information bits in the frame. Further assume the processing time is negligible.

6. For the LAN configuration shown in Figure 2, complete the entries of the forwarding table of the bridges 101 and 106.

Bridge 101 forwarding table
Station	Port
1	X
2
3
4
5
6
7

Bridge 106 forwarding table
Station	Port
1
2
3
4
5
6
7	Y

Reference no: EM132350417

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