Designing a Voice over IP Network in .NET framework

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Designing a Voice over IP Network
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Table 9-3 Busy-hour erlangs (originating) per city
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City1 City2 City3 City4 City5 City6 City7 City8 City9 City10 City11 City12 Launch Launch 3 months 1571 870 943 817 1027 1320 1226 1184 786 1446 1257 1100 6 months 5257 2891 3154 2738 3417 4425 4107 3943 2629 4841 4206 3680 Launch 9 months 11291 6217 6777 5874 7349 9486 8811 8469 5646 10389 9040 7909 Launch 1 year 18579 10225 11154 9667 12084 15616 14501 13943 9295 17103 14872 13013 Launch 18 months 35857 19726 21524 18655 23310 30131 27976 26893 17929 33000 28690 25107 2 years
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Launch
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Launch 3 years 80640 44357 48394 41940 52419 67744 62910 60480 40320 74199 64517 56456
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52941 29120 31770 27535 34419 44472 41303 39706 26470 48707 42355 37069
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Table 9-4 Originating BHCA per city
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City1 City2 City3 City4 City5 City6 City7 City8 City9 City10 City11 City12
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Launch Launch 3 months 1,886 1,043 1,131 981 1,232 1,584 1,471 1,421 943 1,735 1,509 1,320 6 months 6,309 3,470 3,785 3,286 4,101 5,310 4,929 4,731 3,154 5,809 5,047 4,416
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Launch 9 months 13,550 7,461 8,133 7,049 8,818 11,383 10,574 10,162 6,775 12,466 10,848 9,490
Launch 1 year 22,295 12,270 13,385 11,600 14,501 18,739 17,401 16,731 11,154 20,524 17,847 15,616
Launch 18 months 43,029 23,671 25,829 22,386 27,971 36,157 33,571 32,271 21,514 39,600 34,429 30,129
Launch 2 years 63,529 34,944 38,123 33,042 41,303 53,367 49,563 47,647 31,765 58,448 50,826 44,482
Launch 3 years 96,768 53,229 58,073 50,328 62,902 81,293 75,492 72,576 48,384 89,038 77,421 67,747
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Designing a Voice over IP Network
Designing a Voice over IP Network
would need to be handed off to a partner network immediately Therefore, the distribution in Table 9-5 is not realistic, but it will serve the purpose of illustrating the type of information needed
Node Locations and Bandwidth Requirements
When we have established our expected traffic demand and traffic distribution, developed our design criteria, and selected our vendors and products, the next step is to establish the initial network topology The topology of the network will specify how many network elements of a given type will be in each location and the bandwidth requirements between those network elements and the outside world Initially, we will deal with logical connectivity Later, once we are satisfied with the logical connectivity (such as the bandwidth required between nodes), then we can develop greater detail regarding the actual connections That greater detail will involve the specifications of physical connections to routers, such as point-to-point versus ring transport, and so on
MG Locations and PSTN Trunk Dimensioning
Clearly, we will need to place at least 1 MG in each of the 12 cities where we will provide service Given that our MGs will connect to the PSTN, our first task is to determine the size of the trunk groups to the PSTN To do so, we use the Erlang values of Table 9-3 and the traffic distribution statistics of Table 9-5 The Erlang values of Table 9-3 indicate the amount of traffic that we will receive from the PSTN in each city From the traffic distribution percentages of Table 9-5, we can calculate how much traffic will be sent to the PSTN in each city Once we have the total Erlang counts, we can use standard Erlang tables to determine the number of DS0s needed First, however, we must understand how many individual trunk groups we will have to the PSTN (and to our partner long distance [LD] carrier) in each city Erlang calculations are not linear As the number of channels in a trunk group increases, the overall traffic per channel increases For example, a trunk group with 200 DS0s can carry more than twice the traffic of a trunk group with 100 DS0s for the same blocking probability Because of this fact, we cannot simply take the total traffic in and out of a gateway, look up an
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City2 10% 0 8% 5% 8% 9% 8% 8% 6% 8% 7% 7% 0 0 0 0 5% 5% 6% 6% 5% 6% 10% 10% 0 6% 5% 6% 10% 5% 5% 7% 8% 10% 8% 8% 8% 0 7% 6% 8% 10% 13% 7% 6% 8% 9% 0 13% 0 10% 8% 7% 8% 0 6% 10% 8% 0 7% 7% 9% 6% 0 9% 7% 7% 5% 6% 8% 8% 0 7% 7% 8% 0 5% 0 9% 15% 9% 8% 6% 0 5% 10% 10% 7% 6% 5% 11% 10% 10% 9% 9% 9% 9% 0 14% 11% 0 8% 5% 8% 11% 9% 7% 6% 12% 8% 7% 9% 12% 8% 7% 5% 11% 8% 9% 9% 7% 9% 8% 7% 8% 8% 13% 0 10% 0 City3 City4 City5 City6 City7 City8 City9 City10 City11 City12 Other 7% 5% 7% 6% 8% 7% 5% 5% 8% 9% 10% 0 0 8% 8% 10% 9% 11% 12% 9% 8% 14% 9% 10% 11% 0 Designing a Voice over IP Network
Table 9-5
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