Nortel ISDN Signaling Link, Description, Installation And Operation

Page: 94 / 380

Page 94 of 378 ITG Engineering Guidelines
553-3001-202 Standard 1.00 April 2000
Provisioning ITG ISL TIE trunks and routes
ITG ISL TIE trunks are provisioned based on average busy hour traffic tables,
using the calculated amount of traffic between ESN/ITG nodes. Table 12
shows the number of trunks required based on average busy hour CCS for a
1% blocking Grade of Service. Table 13 shows the number of trunks required
based on average busy hour CCS for a 10% blocking Grade of Service.
Note: A lower Grade of Service, such as P.10, may be preferred if
overflow routing is available through the PSTN, circuit-switched VPN,
or ITG ISL TIE trunks.
Table 12
Trunk traffic—Poisson 1 percent blocking Grade of Service (Part 1 of 2)
Trunks CCS Trunks CCS Trunks CCS Trunks CCS Trunks CCS
1 0.4 21 426 41 993 61 1595 81 2215
2 5.4 22 453 42 1023 62 1626 82 2247
3 15.7 23 480 43 1052 63 1657 83 2278
4 29.6 24 507 44 1082 64 1687 84 2310
5 46.1 25 535 45 1112 65 1718 85 2341
6 64 26 562 46 1142 66 1749 86 2373
7 84 27 590 47 1171 67 1780 87 2404
8 105 28 618 48 1201 68 1811 88 2436
9 126 29 647 49 1231 69 1842 89 2467
10 149 30 675 50 1261 70 1873 90 2499
11 172 31 703 51 1291 71 1904 91 2530
12 195 32 732 52 1322 72 1935 92 2563
13 220 33 760 53 1352 73 1966 93 2594
14 244 34 789 54 1382 74 1997 94 2625
15 269 35 818 55 1412 75 2028 95 2657
16 294 36 847 56 1443 76 2059 96 2689
17 320 37 876 57 1473 77 2091 97 2721
18 346 38 905 58 1504 78 2122 98 2752
19 373 39 935 59 1534 79 2153 99 2784
20 399 40 964 60 1565 80 2184 100 2816
Note:
For trunk traffic greater than 4427 CCS, allow 29.5 CCS per trunk.