Specifications

3-44 888-2857-001 5/9/13
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
Platinum VAX-C Series
3.6 Setup Screens - CTTB/CMMB Modulation
Figure 3-27 on left - CTTB Setup on right - CTTB Setup Screen 1
Table 3-22 Xmtr Home>Exciter Home>Setup>CTTB Modulator (screen 1)
Fields Explanation
Power-On Input The selected input, Primary (ASI 1) or Auxiliary (ASI 2), becomes the
active input when the exciter is powered up.
Active Input The selected input, Primary (ASI 1) or Auxiliary (ASI 2), is the active
input
Switching Mode Choices are Auto (automatic) or Manual switching of the ASI Transport
stream. IF in the automatic mode and the current ASI stream has an issue
or drops out, and the Auxiliary Input is set to Yes, the system will switch
to the auxiliary ASI stream if it is available and good.
Network Operation: Choices are MFN (multiple frequency network) or SFN (single frequency
network).
Consult the GB (National CTTB Standard of the People’s Republic of
China) specification on proper modes of operation and make sure the
transport stream input rate feeding the modulator is at or below the
allowed rate for the mode desired.
In MFN mode, the user can select the CTTB parameters that are allowed.
Consult the GB spec on proper modes of operation and make sure the
transport stream input rate you are feeding the modulator is at or below
the allowed rate for the mode desired.
Auxiliary Input: Choices are No or Yes. If yes is selected the exciter can be made to switch
to an auxiliary input if the active input faults or drops out.