tailieunhanh - Air Traffic Control Part 5

Tham khảo tài liệu 'air traffic control part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Link Capacity Dimensioning Model of ATS Ground Voice Network 53 Link between two adjacent nodes Expected traffic in Erl on the link with xk 0 999 Number of channels for expected traffic and permitted blocking probability Pb 0 001 Expected traffic in Erl on the link with xk 0 99 Number of channels for expected traffic and permitted blocking probability Pb 0 01 1-2 4 3 1-3 6 5 1-4 5 4 2-3 5 4 3-5 5 4 Total 25 20 Table 5. Expected traffic on link and necessary number of channels with defined quality It may be observed from the table that there is significant saving in reducing the link availability even on such a small network. By setting priorities for a certain group of calls satisfactory quality can be achieved that will guarantee air traffic safety. In Eurocontrol b 2005 it has been suggested that the number of links between VCSs be determined based on adding redundancy to links between VCSs depending on the number of routes defined between the pair of nodes call origin - destination . However this redundancy is equal also for the expected traffic on a link of Erl and for the traffic of Erl since it is only indicated that the number of links has to exceed the sum of the expected traffic between two VCSs. 6. Bandwidth requirements for voice transmission over IP based network As voice services in G G voice network have stricter requirements regarding call set-up time blocking probability and voice latency than voice services in public network it is essential to get into account those requirements for the network design. Analysis capacity of transport link for IP Internet Protocol based G G voice network is based on the research carried in previous section regarding the number of offered calls per hour and call duration. Impact factor for bandwidth calculation There are many factors involved when calculating the bandwidth required through a network. This section of .