4.3 - Setting the N.I.T. parameters of the DMHD04D/C modulator.
The following parameters can be set on the DMHD04D/C Modulator:
•
Version
- enter the N.I.T version.
•
ONID
- enter the decimal code for the
original Network ID, This is the country
where you are located.
•
NID
- enter the network ID.
• Network Name
- enter the network name.
• Frequency -
Under the N.I.T. Parameters you will find the output frequency of the modulator.
The DMHD04D/C has a secondary adjacent output channel, but the output frequency is set
by the first channel. The frequency of the other channel is automatically adjusted and cannot
be changed by the user. This secondary channel is present to add services to if required. The
user should ensure that 2 adjacent channels are available in the band for the modulator in the
location where the output is to be tuned to.
• T.S. ID -
For each channel, a T.S. ID should be assigned.
• Constellation -
Select the ‘Const.’ control to adjust
• Bandwidth -
Select the ‘Bandwidth’ control to adjust
• F.E.C. -
Select the ‘F.E.C.’ control to adjust
• Guard Interval
- Select the ‘Guard Interval’ control to adjust
• Output Level
- An internal attenuator allows to lower the output level of the modulator.
The attenuator can be adjusted between 0dB (max output) and -20dB.
Some notes on setting the N.I.T parameters and T.S. Id.:
When you make a headend you will probably have more than one modulator in your system. In
order to keep consistency throughout your complete headend, please follow these guidelines:
a. For your complete headend make sure that the N.I.T. (version/ONID/NID/Network
Name) are IDENTICAL throughout the entire system.
b. For your complete headend make sure that all T.S. Id. (Transport Stream ID) are
UNIQUE. Every output channel should have a unique ID in the system. Make sure that a
T.S.Id. does not appear more than once in the system.
8
DMHD04D/C
