Mitel SX-200 DIGITAL Pabx Engineering Information Manual
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Engineering Information 13. TRAFFIC CONSIDERATIONS a General 13.01 This Part specifies the SX-ZOO@ DIGITAL PABX traffic char- acteristics. Information includes: l Busy Hour Call Attempt (BHCA) l System Traffic Capacity e Grade of Service l Receiver Provisioning l Trunk Distribution. Traffic specifications shown here assume a typical fully configured system as shown in Table 13-1, unless otherwise stated. Page 13-1
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Engineering information Page 13-2 TABLE 13-1 TYPICAL CONFIGURED SYSTEM QUANTITIES Category 480-Port Configuration Lines 350 Trunks 54 Cabinets 2 Peripheral Bays: Digital - 2 Analog - 3 Busy Hour Call Attempt (BHCA) 13.02 The BHCA should not exceed the limits specified in Table 13-2. TABLE 13-2 BUSY HOUR CALL ATTEMPTS Traffic Capacity 13.03 The .SX-200m DIGITAL PABX traffic capacity is outlined in Table 13-3. TABLE 13-3 SX-200@ DIGITAL PABX TRAFFIC CAPACITY (Both Way Traffic)...
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Engineering information Grade of Service 13.04 The SX-200@ DIGITAL PABX Grade of Service (GOS) (in terms of blocking) is outlined in Table 13-4. TABLE 13-4 SX-200@ DIGITAL PABX GRADE OF SERVICE (GOS) I Link/Resource Blocking Blocking Probability Link Blocking: Peripheral to Network Network to Network Resource Blocking Software DTMF Receivers, Trunks < 0.1% 0.0% < 0.01% provisioning dependent Receiver Provisioning . 13.05 The number of receivers required to be installed in the PABX is...
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Engineering Information Receiver Traffic (A) = (Originating Calls per hour) x (Receiver holding time (set)) Erlangs 3600 Multiple of holding time (t) = 3 h (~1 Probability of of delay greater than t (P(X)) = 1 - ABSBH/lOO Using Erlang C formula delay curves, knowing t, A, P(X), the minimum number of receivers can be obtained. Trunk Distribution 13.03 Since the digital bays are non-blocking, while the analog bays are blocking, as many trunks as possible should be distributed in the digital...
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Engineering Information TABLE 13-5 HEAVY TRAFFIC - out CCS 140 176 216 254 292 329 365 402 439 476 511 547 563 619 655 691 - OUt ccs 76 97 118 138 159 179 199 220 240 259 279 298 318 337 357 377 395 415 - ntre :ei1s 77 106 136 187 188 229 281 292 324 356 388 420 542 483 516 547 - Drig falls xiii 238 296 356 414 473 533 591 651 717 770 829 888 946 1007 1065 In rrks 11 12 14 16 17 19 20 21 23 24 25 27 28 29 a?...
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Engineering information TABLE 13-7 LIGHT TRAFFIC IO. of ccw IO. of ccw Total Total .ines .ines LhW LhW cc5 cc5 2s d& out out lntra lntra ccs cek cs: ccs cek cs: lntre lntre Orig In Orig In out out PWay PWay CCS ccs CdlS Calls Cells Cells Receivers Required Receivers Required Trks Trks Trks Trks Trks Trks Receivers Required Receivers Required for A6SBH = 98.5% for A6SBH = 98.5% for ABSBH = 99.5% for ABSBH = 99.5% 60 60 1.41 1.41 a5 65 36 36 33 33 16 16 20 20 24 24...
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Engineering Information APPENDIX A CALL PROCESSING INFORMATION Al.01 1. - Digital Bay to Digital Bay (within bays 1 and 2) The Main Control Card (MCC) scans for on-hook/off-hook change of state. 2. 3. 4. An extension goes off-hook in Bay 1. The MCC detects the off-hook during its line card scan. MCC checks for the COS of the extension to determine if the call is allowed. 5. 6. The MCC checks for and idle receiver. The MCC connects the DTMF receiver to the line circuit through the DX...
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Engineering Infqrmation P 18. 19. 20. 2-i. 22. Al .02 1. 2. 3. 4. 5. 8. 7. 8. 9. 10. 4 1. 12. 13. 14. 15. Ringing is removed from the destination. Ringback is removed from the originator. A channel is connected between the originator and the destina- tion. The MCC scans for on-h=Woff-hook changes of state. When an on-hook is detected, the MCC removes the channel, and the call is terminated. - Analog Bay (Rotary) to Analog Bay The Scanner card scans the line circuits for...
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. Engineering Information 16. If the destination is idle, the MCC connects the DSP to the originator and ringback tone is supplied. 17. The MCC sends a cadence message to the PCC of the origina- tor to provide interruption of the ringback tone. 18. 19. The MCC sends a message to the PCC to ring the destination. When the destination answers, the Scanner detects the off- hook. 20. 21. The Scanner sends an IRQ to the PCC. The PCC stops ringing and sends a message to the MCC in- dicating that the...
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MITEL STANDARD PRACTICE - SECTION MITL9108-093-350-NA Issue 2, September 1986 SX-200” DIGITAL PRIVATE AUTOMATIC BRANCH EXCHANGE (PABX) TROUBLESHOOTING Copyright of MiTEL Corporation 1986 TM - Trademark of MITEL Corporation @‘Registered Trademark of MiTEL Corporation i