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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  
    						
    							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) 
    System/Port Calls/Hour Erlang CC% 
    per Port 5.59 0.19 6.83 
    System 1956.50 66.50 2390.5  
    						
    							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 
    dependent on various factors, such as the number of lines and 
    trunks installed, the amount of traffic flow estimated for the system 
    and the desired grade of service. In order to arrive at the quantity of 
    receivers required the following assumptions were made: 
    l Average receiver holding time for intercomcall is 6 seconds 
    0 
    Average receiver holding time for a trunk call is 17.4 seconds 
    0 
    Holding time for receivers is exponential 
    0 
    Call originations are Poisson 
    l Call holding times are exponential 
    e 
    Receivers are provisioned in multiples of 4. 
    13.06 For a given load (heavy, medium and light traffic), the minimum 
    number of required receivers was determined for the following 
    grades of service (ABSBH): 
    9 ABSBH = 98.5 - 98.5 % of all receiver requests serviced within 3 
    seconds. 
    a ABSBH = 99.5 - 99.5 % of all receiver requests serviced within 3 
    seconds. 
    13.07 The following calculations are used to generate Tables 13-5 
    through 13-7: 
    Receiver Holding Time ( h ) = 6 x (% intercom traffic) + 
    17.4 x (% trunk traffic) Seconds 
    Page 13-3  
    						
    							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 bays. Analog type trunks should be evenly distributed 
    throughout the analog bays. For example, a fully configured system in 
    a heavy traffic environment might have four to five trunk cards in each 
    of the anlog bays. 
    Page 13-4  
    						
    							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? 
    32 
    - Out wsy Trks rrks 
    -ii- 16 
    11 19 
    13 228 
    14 25 
    15 28 
    17 30 
    18 33 
    20 36 
    21 38 
    22 41 
    23 43 
    25 46 
    26 48 
    27 51 
    28 53 
    30 
    55 lo. hoe 
    60 
    80 
    100 
    120 
    140 
    160 
    180 
    200 
    220 
    240 
    260 
    280 
    300 
    320 
    340 
    360 zcs/ Line 
    5.94 
    5.77 
    5.67 
    5.60 
    5.55 
    5.51 
    5.48 
    5.46 
    5.44 
    5.43 
    5.41 
    5.40 
    5.39 
    6.38 
    5.38 
    5.37 - 
    lntra 
    ccs 
    - 
    67 
    93 
    120 
    149 
    177 
    207 
    237 
    267 
    298 
    330 
    362 
    394 
    428 
    459 
    493 
    526 I In 
    L3lls 
    -iT 
    108 
    131 
    153 
    174 
    196 
    217 
    238 
    258 
    279 
    299 
    319 
    338 
    357 
    376 
    395 
    - 
    :ak 
    OUt 
    MIS 
    103 
    132 
    160 
    189 
    216 
    244 
    272 
    299 
    327 
    355 
    382 
    409 
    436 
    463 
    491 
    518 
    TDtel 
    ccs 
    - 
    356 
    462 
    567 
    672 
    777‘ 
    882 
    986 
    1092 
    1197 
    1303 
    1407 
    1512 
    1617 
    1722 
    1829 
    1933 dc”S 
    - 
    150 
    190 
    230 
    269 
    306 
    346 
    364 
    422 
    460 
    497 
    534 
    570 
    607 
    643 
    680 
    716 
    - Receivers Required 
    for ABSSH = 98.5% Receivers Required 
    for ABSSH = 99.5% 
    4 
    4 
    4 
    8 
    8 
    8 
    8 8 
    8 8 
    ii 8 
    8 
    8 
    8 8 
    8 
    8 
    8 
    8 
    8 8 
    8 
    R 
    8 12 
    8 12 
    12 12 
    12 12 
    TABLE 13-6 
    MEDIUM TRAFFIC 
    Orig 
    MIS 
    98 
    130 
    161 
    194 
    126 
    258 
    290 
    323 
    355 
    387 
    220 
    452 
    464 
    512 
    548 
    581 
    612 
    644 
    In Trks 
    7 
    8 
    9 
    10 
    11 
    12 
    13 
    14 
    15 
    16 
    16 
    17 
    18 
    19 
    19 
    20 
    21 
    22 
    - 
    Out !Wey Frks Trks 
    6 11 
    8 13 
    8 14 
    9 16 
    10 18 
    11 19 
    12 21 
    13 22 
    13 24 
    14 25 
    15 27 
    16 26 
    16 30 
    17 31 
    18 32 
    19 34 
    19 35 
    20 36 
    ccs/ rotal Line ccs 
    3.23 i&i 
    3.14 251 
    3.09 309 
    3.05 366 
    3.02 423 
    3.00 480 
    2.99 536 
    2.98 596 
    2.87 653 
    2.96 710 
    2.95 767 
    2.94 623 
    2.94 882 
    2.93 
    938 
    2.93 996 
    2.93 1055 
    2.92 1110 
    2.92 1166 
    Out 
    3alls 
    - 
    56 
    72 
    87 
    103 
    118 
    133 
    148 
    163 
    178 
    193 
    206 
    223 
    238 
    252 
    267 
    263 
    297 
    312 
    - 
    ntra 
    hIIS 
    42 
    58 
    74 
    91 
    108 
    125 
    142 
    160 
    177 
    194 
    212 
    229 
    246 
    263 
    281 
    298 
    315 
    332 
    -  IO. of 
    snes 
    - 
    60 
    80 
    100 
    120 
    140 
    160 
    180 
    200 
    220 
    240 
    260 
    260 
    300 
    320 
    340 
    360 
    360 
    400 d& ntra 
    CCS 
    37 
    51 
    66 
    81 
    96 
    113 
    129 
    146 
    163 
    180 
    197 
    214 
    233 
    250 
    269 
    287 
    305 
    324 Receivers Required Receivers Required 
    for ASSSH = 98.5% 
    for ASSBH = 99.5% 
    81 
    103 
    125 
    147 
    168 
    188 
    210 
    230 
    251 
    271 
    291 
    311 
    331 
    350 
    371 
    391 
    409 
    429 46 
    59 
    71 
    83 
    95 
    109 
    118 
    130 
    141 
    152 
    163 
    174 
    185 
    195 
    205 
    215 
    225 
    235 4 4 
    4 
    4 
    4 4 
    4 4 
    4 4 
    4 
    8 
    4 8 
    8 
    8 
    8 8 
    8 
    8 
    8 
    8 
    8 8 
    8 8 
    8 
    8 
    8 
    B 
    8 8 
    8 8 
    8 8 
    Page 13L5  
    						
    							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 16  16 42  42 5  5 4  4 7  7 4  4 4  4 
    a0  80 1.41  1.41 113  113 46  46 44  44 23  23 26  26 32  32 26  26 58  59 6  6 5  5 8  8 4  4 4  4 
    100  100 1.41  1.41 141  141 57  57 54  54 30.  30. 33  33 40  40 34  34 74  74 6  6 5  5 9  9 4  4 4  4 
    120  120 1.41  1.41 169  169 69  69 64  64 37  37 38  38 47  47 42  42 69  69 7  7 6  6 .lO  .lO .  . 4  4 4  4 
    140  140 1.41  1.41 197  197 78  78 74  74 45  45 44  44 55  55 Xl  50 105  105 7  7 6  6 11  11 4  4 4  4 
    Page % 3-6/6  
    						
    							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 matrix on a PCM channel. 
    7. The MCC connects the same channel to the Digital Signal Pro- 
    cessor (DSP) to provide dial tone. 
    8. 
    9. The MCC monitors the circuit for rotary pulses. 
    The DTMF receiver detects any DTMF tones and sends a mes- 
    sage to the MCC indicating the value of the dialed digits. 
    10. On receipt of the first digit, the MCC removes the DSP from the 
    assigned channel. 
    11. The MCC monitors the digits dialed and checks the idle/busy 
    condition of the destination. 
    12. If the destination is idle, the MCC connects the DSP to the 
    originator and- ringback is supplied. 
    13. The MCC sends the originator a cadence message to provide 
    interruption of the ringback tone. 
    14. The MCC sends ringing to the Bay Power Supply from the DSP 
    via a DX link. 
    15. The Bay Power Supply amplifies and routes the ringing to the 
    destination. 
    ‘16. The MCC sends a message to the destination to turn ringing on. 
    17. When the destination answers, the MCC detects the off-hook 
    change of state. 
    Page A-7  
    						
    							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 on-hook/off-hook 
    changes of state. 
    An extension goes off-hook in Bay 3. 
    The Scanner detects an off-hook during the line card scan. 
    The Scanner sends an IRQ to the Peripheral Control Card (PCC). 
    The PCC determines the originator, generates a message and 
    passes it to the Digital Interface Card (DIC). . 
    The DIC formats and sends a message to the MCC. 
    The MCC checks the originator’s COS to determine if the call is 
    allowed. 
    The MCC checks for an idle DTMF receiver. 
    The MCC sends a message to the PC6 to connect a junctor to 
    the originator. 
    The MCC assigns a channel of the link to the junctor, and 
    conects the DTMF receiver to the channel through the DX ma- 
    trix. 
    The MCC connects the same channel to the DSP to provide dial 
    tone. 
    The PCC monitors the circuit for rotary pulses. 
    The DTMF receiver detects any DTMF tones and sends a mes- 
    sage to the MCC indicating the value of the tones. 
    On receipt of the first digit, the MCC removes the DSP from the 
    assigned channel. 
    The MCC monitors the digits dialed and checks the idle/busy 
    condition of the destination. 
    Page A-2  
    						
    							. 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 destination is off-hook. 
    22. 
    23. Ringback is removed from the originator. 
    Since both parties are in Bay 3, the MCC sends a message to 
    the PCC to provide a connection between the originator and the 
    destination using a speech path. (There are no PCM channels 
    used in this connection). 
    24. The Scanner scans for on-hook/off-hook changes of state. 
    25. When an on-hook is detected, the PCC sends a message to th.e 
    MCC indicating that the extension(s) have gone on-hook; the 
    call is terminated. 
    Page A-3/3  
    						
    							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  
    						
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