CTP Systems CTPhone 1900, Applications Manual

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2-8 DOC00101-01
CTPhone 1900 System Planning
You can use Table 2-A to help you determine how many base stations you
need to accommodate various numbers of users at several different traffic
levels. The table assumes users have access to all base stations in a high
traffic environment as seen in Figure 2-6.
Table 2-A. Base Station Traffic Requirements
1
1
This table assumes a P.01 grade of service (one call blocked out of 100 attempts).
Erlangs
2
Per User
2
Typical usage assumes .1, .15, and .2 Erlangs (6 minutes, 9 minutes, and 12 minutes,
respectively) per line during the busiest hour of the day.
Number
of Users
Total
Erlangs
Equivalent
CCS
3
3
CCS stands for centi-call seconds, or 100 seconds of phone conversation.
Required
Channels
Base Stations
Required
“Mini”
Base
Stations
Required
.1 10 1 36 5 1 2
20 2 72 6 1 2
30 3 108 8 1 2
32 3.2 115.20 8 1 2
.15 10 1.5 54 6 1 2
20 3 108 8 1 2
32
4
4
Assuming base stations are co-located.
4.8 172 11 2 3
.2 10 2 72 6 1 2
16 3.2 115.20 8 1 2
32
4
6.4 230.4 13 2 4