Traffic Intensity Calculation; Analog Trunk - Toshiba Strata CIX Programming Manual

Traffic Intensity Calculation

Analog Trunk

Traffic Intensity is calculated based on how long each trunk is in use during the measurement hour.
The time a trunk circuit is in use is called hold time. Holding time is measured per trunk. Holding
time T_hold (seconds) is calculated as below;
T_off (seconds) is the time when the trunk is available. T_on (seconds) is the time when the trunk
is in use. "Trunk is in use" indicates the condition that the trunk is not free (i.e. talking, terminating,
originating, and so on).
Traffic intensity A is calculated as shown below;
The relation of Erlang to CCS is 1 Erlang = 36 CCS. The system administrator can choose Erlang
or CCS as unit of Traffic intensity.
The system checks each circuit every 30 seconds for in-use or available status. As shown in the
figure below, if a becomes busy after a system check it is not counted as busy, for traffic
measurement, until the next system check.
Trunk 1 ON
OFF
OLG1
Trunk 2 ON
OFF
Trunk 3 ON
OFF
CIX software collects busy/idle status of each
CTX software collect each trunk/trunk Gr
trunk in each trunk group at the beginning of
idle/busy information.
each period.
Figure 6-1 Holding time
Strata CTX Application Implementation Vol 3
=
T T
hold
∑
T
=
hold
A
100
30 60
90 120
10/07
Traffic Measurement and Reporting
−
T
off on
[ CCS ]
210
180
150
Each collection period is 30 sec-
Each collect period is 30 sec.
onds
Traffic Intensity Calculation
: Holding Time
Sec.
6-7