ND SatCom SKYWAN IDU 1070, Manual

Page: 59 / 154

2010-10-26 Network Design and Engineering Guide 55
General Carrier Design
TDMA Carrier Design with ’TDMA Calculator’
2.6 TDMA Carrier Design with ’TDMA Calculator’
As outlined in the previous section, the calculation of the required frequency bandwidth of Sky-
WAN
®
carriers for an estimated user data rate must take into account
- the contributions of the satellite link layer,
- the modulation scheme,
- the modem overhead.
The ’ND SatCom Products GmbH TDMA Calculator’ is a java based tool, which calculates for
each carrier the user data rate and frequency bandwidth, based on the given modem data rate
from the network capacity calculation.
Two versions of the tool are available: a stand-alone version and a tool, which is invoked from
the ’
Sky NMS Network Configurator’. Both versions have the same GUI and functionality; there-
fore only specifics and differences are pointed out explicitely.
-
stand-alone ’ND SatCom Products GmbH TDMA Calculator’: open application by double-
click on desktop icon or via ’Start -> Programs -> ND SatCom Products GmbH -> TDMA
Calculator -> ND SatComs Products GmbH TDMA Calculator’. The calculated output pa-
rameter can be exported and copied into the relevant configuration profile parameter. A
menu bar is available for exiting the application, export and import to/from a file and to show
via ? and About entry the toolrelease version. A status line is provided, where output mes-
sages are displayed.
The stand-alone version is a software application that does not need a login.
- ’TDMA Calculator’ as tool integrated in the ’ Sky NMS Network Configurator’ application. In
Sky NMS the tool is invoked in the following way: in Sky NMS menu ’Network Configuration’
select the entry ’ Sky NMS Network Configurator’. Browse in the configuration tree to the ap-
propriate network group and profile. In the mouse context menu select entry ’Open TDMA
Calculator’. The integrated tool version allows for transfering the calculated output data into
the corresponding profile parameter with a mouse click.
In the
Sky NMS integrated TDMA Calculator (error) messages are displayed in the ’Output’
window and the statusline of the ’ Sky NMS Network Configurator’. Arrange the windows in
such a way, that the ’ Sky NMS Network Configurator’ messages (in the background) are
visible for you.
Running the ’TDMA Calculator’ from the Network Configurator is only possible with the
user right ’Full Access’. In other cases, the execution is not permitted.
Figure 2-38 Start integrated SkyNMS TDMA Calculator