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Mitel SX-200 DIGITAL Pabx Engineering Information Manual

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Page 71

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  

Page 72

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)...

Page 73

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...

Page 74

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...

Page 75

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?...

Page 76

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...

Page 77

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...

Page 78

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...

Page 79

. 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...

Page 80

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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