(a) A remote concentrator unit is used to connect a group of 100 voice subscribers to an exchange. During the busy hour

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A A Remote Concentrator Unit Is Used To Connect A Group Of 100 Voice Subscribers To An Exchange During The Busy Hour 1 (73.98 KiB) Viewed 17 times

Erlang B traffic table below
maximum offered load Versus B and N( B is in %)

A A Remote Concentrator Unit Is Used To Connect A Group Of 100 Voice Subscribers To An Exchange During The Busy Hour 2 (108.26 KiB) Viewed 17 times

(a) A remote concentrator unit is used to connect a group of 100 voice subscribers to an exchange. During the busy hour it is found that the total traffic from the group is 20 Erlangs. (i) From the extract of the Erlang blocking probability table provided, calculate the number of trunk circuits required between the concentrator unit and the exchange if a 1% Grade of Service is to be provided. How much traffic is lost? Comment on the efficiency of the use of each trunk circuit under these conditions. (ii) The data rate of one standard E1 multiplexer is 2.048 Mbits/s. Each trunk circuit of the above concentrator works as a voice channel with a data rate of 64 kbits/s. To connect the concentrator and the exchange, a framing channel and a signalling channel will be added. The data rate for each channel is 64 kbits/s. Evaluate whether an E1 multiplexer is suitable to connect between the concentrator unit and the exchange. [10 marks]
N/B 0.01 0.05 0.1 0.5 10 2 5 10 15 20 30 40 1 0001 .0005 0010 0050 0204 0526 1111 1765 2500 4286 6667 0142 7962 1.000 1.449 2.000 0868 0101 0321 0458 1054 1526 2235 3813 5954 1517 1938 3490 4555 6022 4393 7012 8694 1.092 6486 7621 1.132 1.361 8994 1.271 1.603 1.930 2.633 3.480 2347 3624 1.525 2.045 2,501 2.945 3.891 5.021 5 4520 1.657 2.219 2.881 3,454 4.010 5.189 6.596 7282 2,276 2.960 3.758 4.445 9957 1.146 1.622 1.392 1.579 2.158 5.109 6.514 8.191 1.909 2.501 2.935 3.738 1.054 4.666 5.461 6.230 7.856 9.800 1.422 3.128 3.627 5.597 6.498 7.369 9.213 11,42 1.830 2.051 2,730 1.826 2.302 2.558 3.333 4.543 5.370 6.546 7.551 4.345 8.522 3.783 2.803 3.092 3.961 4.461 10.58 13.05 5.084 6.216 7.511 8.616 9.685 11.95 14.68 3.329 3.651 4.610 5.160 5.842 7.076 8.487 9.691 10.86 13.33 16.31 3.878 4.231 5.279 5.876 6.615 7.950 9.474 10.78 12.04 14.72 17.95 5.964 6.607 7.402 8.835 10.47 11.87 13.22 16.11 19.60 4.447 4.831 5.032 5.634 6.077 5.446 6.663 7.352 8.200 9.730 11.47 12.97 14.41 17.50 21.24 10.63 12.48 14.07 15.61 18.90 22.89 7.376 8.108 9.010 5.339 6.250 6.722 8100 8875 9.828 5.911 6.878 7.378 8.834 9.652 11.54 13.50 15.18 16.81 20.30 24.54 16.29 18.01 21.70 26.19 10.66 1246 14.52 11.49 13.39 15.55 17.41 6.496 7.519 8.046 9.578 10.44 19.22 23.10 27.84 7.093 8.170 8.724 10.33 11.23 12.33 1432 16.58 18.53 20.42 24.51 29.50 7.701 8.831 9.412 11.09 12.03 13.18 15.25 17,61 19.65 21.64 25.92 31.15 8.319 9.501 10.11 11.86 12.84 14.04 16.19 18.65 20.77 22.85 27.33 3281 10.18 10.81 12.64 13.65 14.90 17.13 19.69 21.90 24.06 28.74 34.46 10.87 11.52 13.42 14.47 15.76 23.03 25.28 30.15 36.12 12.24 14.20 15.30 16.63 19.03 21.78 24.16 26.50 31.56 37.78 12.97 15.00 16.13 17.51 19.99 22.83 25.30 27.72 32.97 39.44 15.80 16.96 18.38 20.94 23.89 26.43 28.94 34.39 41.10 14.44 16.60 17.80 19.27 1.90 24.94 27.57 30.16 35.80 42.76 14.41 15.18 17.41 18.64 2015 22.87 26.00 28.71 44.41 31.39 37.21 32.61 38.63 15.13 15.93 18.22 21.04 23.83 27.05 29.85 46.07 19.49 20.34 15.86 16.68 19.03 21.93 24.80 28.11 31.00 33.84 40.05 47.74 16.60 17.44 19.85 21.19 22.83 25.77 29.17 32.14 49.40 35.07 41.46 17.34 18.21 20.68 22.05 23.73 26.75 30.24 33.28 36.30 42.88 51.06 18.09 18.97 21.51 22.91 24.63 27.72 31.30 34.43 37.52 44.30 52.72 18.84 19.74 22.34 23.77 25.53 32.37 35.58 38.75 45.72 54.38 28.70 29.68 19.59 20.52 23.17 24.64 26.44 33.43 36.72 39.99 47.74 5604 21.30 24.01 25.51 27.34 30.66 20.35 37.87 34.50 41.22 48.56 57.70 24.85 26.38 28.25 22.08 35.57 31.64 39.02 21.11 49.98 59.37 42.45 22.86 25.69 27.25 29.17 32.62 36.64 40.17 43.68 21.87 61.03 51.40 26.53 28.13 30.08 33.61 23.65 41.32 37.72 22.64 44.91 52.82 62.69 27.38 29.01 34.60 31.00 42.48 23:41 24.44 46.15 38.79 54.24 64.35 28.23 39.86 35.58 25.24 29,89 31.92 6602 24.19 47.38 43.63 55.66 30.77 3284 36.57 29.09 44.78 40.94 48.62 57.08 26.04 24.97 67.68 29.94 31.66 25.75 37.57 26.84 45.91 69.34 58.50 49.85 33.76 42,01 MAWNS 2 3 4 6/7/0/0 8 9 10 2.260 2.722 3.207 3.713 14 4.239 15 4.781 16 12345 11 12 13 679 17 18 19 20 SEBENA 21 22 8.946 23 9.583 24 10.23 11.56 25 10.88 12.26 26 11.54 12.97 13.70 27 12.21 13.69 28 12.88 29 13.56 30 14.25 31 14.94 32 15.63 33 16.34 34 17.04 35 17.75 18.47 19.19 1991 20,64 21.37 22.11 22.85 23.59 SE H BE SERBES 36 37 38 39 40 41 42 43 ME --- - + H +++ - DAS B E ▬ HE 18.08 20.74 M 1.1 1. THE 39 N + IME # H APP PE 1...