Specifications

5/9/13 888-2857-001 3-71
WARNING: Disconnect primary power prior to servicing.
Section 3 Operation
Platinum VAX-C Series
64K LDPC LPDPC (low density parity check), Yes indicates 64k LDPC is being
used, No indicates that the 16k LDPC is being used.
LDPC Parity Check (codes) are part of the inner coding forward error correction
(FEC). Two types of FEC can be used with the associated PLP, they are the 16k
LDPC or the 64k LDPC.
Constellation Choices are QPSK, 16 QAM, 64 QAM, or 256 QAM. This is the main
modulation mode for all subcarriers except for those of the L1 mode.
Rotated QAM Choices are Yes or No. Yes is recommended state. The QAM
constellations can be rotated off their normal axis up to 30 degrees in
order to improve reception. Table 3-6 shows the rotation based on the
constellation type. See Table 3-46 on page 73
TI PI Enter value in white box. Range is 1 to 255. TI Pi is the number of T2
frames in an interleaving frame (when interleaver over multiple T2
frames, TI type = 1). TI Pi must be a factor of Ncells and must be less
than or equal to the number of T2 frames per superframe.
TI Type Choices are 0 or 1. If the TI Type is set to the value '1', than there is one
interleaving frame which spans multiple T2-frames. The number of T2-
frames is indicated by TI Pi. If the TI Type is set to the value '0', then one
interleaving frame corresponds to one T2-frame and contains one or more
time interleaver blocks.
PCR Restamp Choices are Yes or No.PCR Restamp issued for transport interface. YES is
required with transport input.
Softkeys
Setup Displays Setup screen.
Exciter Home Displays Exciter Home screen.
Table 3-44 Xmtr Home>Exciter Home>Setup>DVB-T2 Modulator>Next x4
(screen 5)
Field Explanation