Area 'Data Output Per Frequency Channel; Table 2-5 Summary 'General Data Output' Parameter - ND SatCom SKYWAN IDU 7000 Manual

Parameter Name
Length base gross container
[byte]
Time base slot
Number request slots per
base slot
Total user data rate [kbit/s]
Total frequency bandwidth
[kHz]
Total efficiency [bit/symbol]
Total efficiency [bit/s/Hz]
Table 2-5 Summary 'General Data Output' Parameter
2.6.4

Area 'Data output per frequency channel'

The following carrier specific parameters are displayed in this section:
- User data rate 'User data rate [kbit/s]', symbol rate 'Symbol rate [kBaud]' and frequency
bandwidth per carrier 'Frequency bandwidth [kHz]'. This is the main result of the calcula-
tion, as it determines how much data rate is available on this channel for IP and Frame Re-
lay based applications and as result how much space segment must be leased on the
satellite transponder.
- Calculated minimal signal to noise ratio 'Eb/No [dB]' and 'Es/No [dB]' for the given modu-
lation and coding.
Channel TDMA structure parameter: 'Data slot length [base slots]', length of the request subframe 'Length rqst. frame [time slots]', length of the reference burst subframe 'Length ref. slot [time slots]', channel gross container size 'Length gross container [byte]', data slots 'Data slots per TDMA frame' and total time slots per TDMA frame 'Data rate per slot ass.[bit/s]' .
Current SkyWAN
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If this number is exceeded on any carrier, the solution is invalid and no out-
put results are given.
An error message is displayed either in the stand-alone 'TDMA Calculator'
status line or in the 'SkyNMS Network Configurator' Output window.
If the request burst length is larger than one, additional user capacity may
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be generated by increasing the superframe size.
- The spectral efficiency values per carrier 'Efficiency [bit/symbol]' and 'Efficiency [bit/s/Hz]'.
2010-10-26
Definition
Displays the size of the base gross container of channel 1 with data
slot length = 1, optimized for the specified traffic.
Traffic is sent over satellite in coded gross container packages. A
base gross container holds the traffic data plus some overhead (e.g.
TDMA header, SLL header, signalling bursts ) before adding the For-
ward Error Correction (FEC) bits.
Displays optimized TDMA base slot time of the network in microsec-
onds.
Displays quantity of request slots that could be placed in one base
data slot.
Displays calculated available data rate for the user applications for all
channels.
User data rate per channel is derived as input from the traffic capacity
calculation.
Displays total space segment size. Summary of all symbol rates x
spacing factor of all channels
Displays the average efficiency of all channels :
Efficiency = user data rate / symbol rate.
Displays the average efficiency of all channel:
Efficiency = user data rate / frequency bandwidth.
®
software supports up to 256 time slots per TDMA frame.
Network Design and Engineering Guide
General Carrier Design
TDMA Carrier Design with 'TDMA Calculator'
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