Mitel SX-200 Documentation page 492

APPENDIX A
TRAFFIC CALCULATIONS
General
Al.01 The traffic calculations for determination of receiver provision-
ing and for the provisioning of the DTMF generators are de-
tailed in paragraphs Al.02 and Al.03 below, respectively.
Receiver Provisioning
Al.02 The tables shown in paragraph 12.07 which reflect quant'sties
receivers required for the PABX (under the conditions stated),
are derived in part from the following equations:
6 Intercom T +
R T = 1
120
RT = Receiver Traffic (Erlangs)
Intercom T = Intercom Traffic
Trunk T = Trunk Traffic
Receiver Holding Time (internal)
6 =
Average Call Duration
Receiver Holding Time (trunk)
Average Call Duration
120
Select number of receivers (C)
Calculate "a" = m
C
Using P = 0.015
Use 1 =
H (6) Internal T + (17.4) Trunk T
T
= (max. delay)
( w e i g h t i n g )
Delay in multiples of average holding time
H
number or receivers will carry the required traffic.
SECTION MITL9105/9!
Trunk T
120 2
3
T
1 O-096-180-NA
of
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