ND SatCom SKYWAN IDU 7000, Manual

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2010-10-26 Network Design and Engineering Guide 65
General Carrier Design
TDMA Carrier Design with ’TDMA Calculator’
2.6.4.1 Parameter Summary
Table 2-6 Summary ’Data Output Per Frequency Channel’ Parameter
Parameter Name Definition
User data rate [kbit/s] Displays the user data rate for each channel.
Symbol rate [kBaud] Displays the symbol rate for each channel.
Eb/N0 [dB] Displays required Eb/N0 for the selected modulation scheme, FEC
code rate and gross container size for the given channel. Eb/N0 is
defined as the ratio of Energy per Bit (Eb) to the Spectral Noise Den-
sity (N0).
Es/N0 [dB] Displays required Es/N0 for the selected modulation scheme, FEC
code rate and gross container size for the given channel. Es/N0 is
defined as the ratio of Energy per Symbol (Es) to the Spectral Noise
Density (N0).
Frequency bandwidth [kHz] Displays the calculated frequency bandwidth required on this chan-
nel.
Frequency bandwidth = (1+ roll-off-factor) x symbol rate.
Data slot length [base slots] Displays how many base slots are contained in one data slot for this
channel.
Time slots per TDMA frame Displays how many time slots are contained in one TDMA frame for
this channel.
Attention : If the given number exceeds the allowed maximum (see
note above) the solution is invalid.
Length ref. slot [time slots] Displays how many data slots are configured as reference slot for
this channel.
Length rqst. frame [time slots] Displays how many data slots are configured for all request bursts for
this channel.
Data slots per TDMA frame Displays how many data slots are available within one TDMA frame
for this channel.
Data rate per slot ass.
[bit/s] Displays the datarate per slot (including SLL framing and fragment
descriptors) for each assigned data slot in this channel.
Length gross container [byte] Displays the length of the gross container of this channel.
Efficiency [bit/symbol] Displays the efficiency of this channel :
Efficiency = user data rate / symbol rate
Efficiency [bit/s/Hz] Displays the efficiency of this channel:
Efficiency = user data rate / frequency bandwidth
Maximum number of stream
slots Displays the maximum quantity of data slots which can be allocated
as stream slots for this channel.