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Engineering information
553-2681-100 Standard 5.00 August 1996
Calculating the number of CAS attendants
To calculate the number of attendants required at the Main site that are
serving multiple Remote sites, the Average Speed of Answer grade of service
must be specified. This delay constitutes the average time in seconds that a
call coming from either a Remote site or the Main site, and requiring an
attendant, waits at the site for an attendant to answer.
calculate the CAS attendant requirements.
Furthermore, the following information is required:
— The attendant traffic (Ta) generated at the Main site
— The attendant traffic (Ta) generated at each Remote site
The engineering procedure is as follows:
1
Calculate the attendant traffic (Ta) generated at the Remote site by using
this formula: Ta =
τ
x
AWT/100 CCS
τ
= the number of calls per hour in a Remote site or the Main site that
require an attendant.
AWT = the attendant work time. This is the average time in seconds
taken by an attendant at the Main site to service a call.
2
Calculate the total attendant traffic (Tt) by adding the attendant traffic
(Ta) from each Remote site to the attendant traffic (Ta) at the Main site.
3
Select the appropriate table (
).
4
Select the appropriate column in the table according to the attendant
work time (AWT).
5
The number of attendants required corresponds to a value T CCS in the
column chosen, where T CCS
≥
Tt CCS.
Note:
attendant overload delay (10.0 seconds) and a 92 percent attendant
occupancy.
