 91.15 99.72 110.57 115.23 124.01 134.88 Erlang-B occupancy Lines P(B) = 0.01 P(B) = 0.02 P(B) = 0.05 P(B) = 0.10 0.682 0.727 0.794 0.850 0.783 0.818 0.870 0.911 0.828 0.859 0.902 0.935 0.855 0.882 0.920 0.948 TABLE 23.5 Erlang-B Capacity Tables for Low Blocking Rates Erlang-B capacity Lines P(B) = 0.0001 P(B) = 0.0002 P(B) = 0.0005 P(B) = 0.0010 69.24 70.88 73.24 75.24 156.14 158.72 162.46 165.62 246.39 249.72 254.56 258.64 338.34 342.32 348.09 352.99 431.35 435.91 442.53 448.15 525.11 530.20 537.60 543.89 619.43 625.01 633.14 640.06 714.19 720.23 729.05 736.55 809.32 815.80 825.25 833.32 904.73 911.63 921.71 930.31 TABLE 23.6 Erlang-B Occupancy Tables for Low Blocking Rates Erlang-B occupancy Lines P(B) = 0.0001 P(B) = 0.0002 P(B) = 0.0005 P(B) = 0.0010 0.692 0.709 0.732 0.752 0.781 0.793 0.812 0.827 0.821 0.832 0.848 0.861 0.846 0.856 0.870 0.882 0.863 0.872 0.885 0.895 0.875 0.883 0.896 0.906 0.885 0.893 0.904 0.913 0.893 0.900 0.911 0.920 0.899 0.906 0.916 0.925 0.905 0.911 0.921 0.929 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Traffic Engineering for Voice and Data Traffic Engineering for Voice and Data 23.2 Effects of Adding ISDN Service Adding circuit-switched data service to the demand for voice calls changes the traffic engineering in three important ways: The larger size of each data channel reduces the efficiency of our resource utilization. Having a mix of large and small users makes the traffic engineering models more compli- cated. Balancing the blocking requirements of large and small users requires strategic blocking of small users. Consider a resource that handles 40 voice calls in which each voice call uses 14,400 bits per second. This same resource also can handle four Integrated Services Digital Network (ISDN) circuit-switched data calls at 144 kbps. To the ISDN user who is 10 times larger, the resource looks 10 tim