Adtec digital mediaHUB-HD 422 (version 1.01.10_M_2) Manual - Manual (Page 45)

NIT Parameters- specify options for the Network Information Table.
Control Function Options
API
Command
Service Type type of network carrier
Cable
Satelllite
Terrestrial
*.ECMD
NPR
Modulation
type of modulation being applied
Service Type is cable: 16, 32, 64, 128, 256
Service Type is satellite: QPSK
Service Type is terrestrial: QPSK, 16QAM, 64QAM
see at left
*.ECMD
NPR
Frequency
frequency of the signal
measured in Hertz (Hz.)
text field
*.ECMD
NPR
Symbol Rate
gross bit rate of the signal
measured in Symbols per Second (symbols/sec.)
text field
*.ECMD
NPR
FEC Inner
Forward Error Correction; extra data added to the inner 'edge' of the packet
that can be used to detect errors on the receiving end
1/2
3/4
5/6
7/8
8/9
No Coding
*.ECMD
NPR
FEC Outer
Forward Error Correction; extra data added to the outer 'edge' of the packet
that can be used to detect errors on the receiving end
1/2
3/4
5/6
7/8
8/9
No Coding
*.ECMD
NPR
Polarization orientation of the transmitter that will send the encoded packet
Horizontal
Linear
Vertical
Linear
Left Circular
Right
Circular
*.ECMD
NPR
Orbital Position orbital position of a receiving satellite text field
*.ECMD
NPR
Position Flag
designates if the receiving satellite is in the eastern or western phase of its
orbit East
West *.ECMD
NPR
Bandwidth measure of the volume of information contained in the packet in megaHertz
8 MHZ
7 MHZ
6 MHZ
*.ECMD
NPR
Hierarchy Info specifies if the transmission is hierarchical
None
1
2
3
4
*.ECMD
NPR
Code Rate LP
Stream
Low Priority Code Rate
1/2
3/4
5/6
7/8
*.ECMD
NPR
Guard Interval
time intervals used to maintain the "distinctness" of transmissions such as
packets in a bitstream. Expressed as fractions of a symbol period. 1/32 =
lowest protection/highest data rate; 1/4 = highest protection/lowest data rate.
1/32
1/16
1/8
1/4
*.ECMD
NPR
Transmit Mode specifies number of carriers in an OFDM frame
2k
8k *.ECMD
NPR
indicates whether other frequencies are in use
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