Meridian America 21, 51, 61, 71 Calculations with Direct inward System Access (DISA)

4-4 Feature calculations
Calculations with Direct inward System Access (DISA)
This method is used when a system is equipped with DISA. The following
is assumed:
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The DISA calls come through DISA trunks or DID trunks.’
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75% of DISA calls require security code.
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The average number of digits in the security code is 4 (range is 1 tc 8).
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The DISA receiver holding time is 6.2 seconds.
Procedure 4-2
Calculations with DISA
1 Calculate the number of DISA calls.
DISA calls = 100 x DISA traffic
call holding time
2Calculate the DISA receiver traffic.
DISA receiver traffic = 6.2 x DISA calls
100
3Add this traffic to (2) in Method 2 and proceed with the remainder .__
of Method 2 calculations.
System engineering 553-3001-151
. .