ND SatCom SKYWAN IDU 7000, Manual

Page: 51 / 154

2010-10-26 Network Design and Engineering Guide 47
General Carrier Design
Network Traffic Estimation
a specific carrier, i.e. how many stations have this carrier configured as their home channel.
The traffic requirement for this carrier can be derived by adding up the station traffic require-
ments of all stations assigned to this carrier.
Voice Traffic Flow Worksheet
The Erlang B calculation estimates the voice traffic for the whole network. To break this down
to individual stations, an assumption concerning the traffic flows in the network must be made.
The worksheet “Voice Traffic” allows the specification what fraction of the voice traffic will be
necessary between stations of a specific type. The following picture represents that sheet filled
with data from our network example:
Figure 2-29 Traffic Calculation Example - Voice Traffic Flow Worksheet
The input values in this sheet are the fractions of voice calls switched within or between stations
of a specific type, the output values the amount of voice traffic for one station of a specific type.
Note that these fractions have to add up to 100%.
Carrier Configuration Worksheet
The next worksheet ’Carrier Configuration’ supports the definition of multi-carrier Sky WAN
®
networks. The single carrier option is already predefined: Here all stations are assigned to
carrier 1. The sheet allows the definition of networks with 2-8 carriers by arbitrarily distributing
stations among carriers. The following picture figure 2-30 displays a possible 2 and 3 carrier
solution for our example network.