ND SatCom SKYWAN IDU 7000, Manual

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62 Network Design and Engineering Guide 2010-10-26
General Carrier Design
TDMA Carrier Design with ’TDMA Calculator’
Table 2-4 Summary ’Data Input Per Frequency Channel’ Parameter
2.6.3 Area ’General Data Output’
The general data output section of the TDMA calculator contains parameters which are not car-
rier specific. The following output parameters are displayed:
- TDMA structure parameter: ’Reference burst mode’, ’Number of reference channels’,
’TDMA Frame time’, ’Size superframe (act.) [TDMA frames]’, ’Length base gross contain-
er’, ’Time base slot’, ’Number request slots per base slot’.
- The summarized user data rate available on all Sky WAN
®
carriers ’Total user data rate
[kbit/s]’.
- The summarized space segment usage including minimal carrier spacing: ’Total frequency
bandwidth [kHz]’
- Spectral efficiency values: ’Total efficiency [bit/symbol]’ and ’Total efficiency [bit/s/Hz]’ .
2.6.3.1 Parameter Summary
(Time slot sizing)
ruled by Select '1'
The base gross container size and slot time factor is defined in that
way that the resulting data rate per slot assignment will support the
transport of one or multiple Frame Relay voice calls per slot.
Select '2', ’3', '5' or '6':
The base gross container size and slot time factor is defined in that
way that the resulting time slot container will transport one or multiple
packets of the selected traffic type including the satellite link layer
framing and fragment descriptor. The packet size is assumed to be
identical to the average packet length specified in the corresponding
traffic type definition.
(Time slot sizing)
per slot [call] Type in how many packets shall be inserted in one data container.
Parameter Name Definition
Reference burst mode Displays the reference burst mode selected. Networks support three
different reference burst modes:
- Standard multiple reference burst mode (MRB),
- Multiple reference burst with dual uplink beam (MRB-DUB),
- No direct feedback on reference burst with dual uplink beam (NFB-
DUB).
Number of reference chan-
nels Displays the calculated amount of reference channels.
TDMA Frame time Displays the calculated value of TDMA frame time in microseconds.
Size superframe (act)
[TDMA frames] Displays the optimized actual superframe size.
Parameter Name Definition