Multiple Overlapping Systems - Toshiba Strata AirLink Installation Manual

Pre-installation
Step 3: Review Possible System Configurations

Multiple Overlapping Systems

Multiple overlapping configurations (see
9) create a system with greater user capacity.
This configuration works for the BSIA or RWIU
systems.
Use Table 3
Stations are needed to accommodate the
numbers of users at different traffic levels.
It is assumed that users have access to
Note
all Base Stations in a high-traffic
environment where only one call is
blocked out of 100 attempts.
Table 3 Base Station Traffic Requirements
Erlangs
Per User
.1
.15
.2
1. Typical usage assumes .1, .15, and .2 Erlangs (6 minutes, 9 minutes, and 12 minutes, respectively, where 1
Erlang equals 60 minutes of usage) per line during the busiest hour of the day.
2. CCS stands for centi-call seconds, or 100 seconds of telephone conversation.
3. Assumes Base Stations are co-located.
10
to determine how many Base
1
Number Total
of Users Erlangs
10 1
20 2
30 3
32 3.2
10 1.5
20 3
3
32 4.8
10 2
16 3.2
3
32 6.4
Figure
Strata DK
RWIU
Strata DK
RWIU
Figure 9 Multiple Overlapping Systems
Equivalent
Required
2
Channels
CCS
36 5
72 6
108 8
115.20 8
54 6
108 8
172 11
72 6
115.20 8
230.4 13
Strata AirLink Installation Guide
Base Station 1
Base Station 3
Base Station
Broadcast Area
Base Station 2
Base Station 4
3729
Base Stations
Required
1
1
1
1
1
1
2
1
1
2
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