Promax MO-180 Manual De Usuario página 118

These tables are similar to Tables 17 (8 MHz), E.6 (7 MHz), E.3 (6 MHz) and
G.3 (5 MHz) in document ETSI EN 300 744 v 1.5.1 (2004-11), but with 7 digits of
accuracy instead of 2 or 3. This additional accuracy is necessary since the bit rate of
the input transport streams when operating in slave mode should not deviate more
them a 0.1‰ from the values shown herein, otherwise the MO-180 will not lock. For
example, for QPSK, code ½ and guard interval of 1/4, the useful bit rate of DVB-T
systems for 8 MHz bandwidth channels is 4.9764706 Mbps, thus in slave mode the TS
input bit rate to which the modulator is able to sync should be greater than 4.975973 Mbps
and lesser than 4.976968 Mbps.
Convolutional
Constellation
QPSK
16QAM
64QAM
Table 3.- Useful bit rate (Mbps) for DVB-T modes and 8 MHz channel bandwidths.
For hierarchical modulations with an 8 MHz bandwidth, the useful bit rates can
be obtained from Table 1 following these indications:
-
Sequence of high priority (HP): QPSK values.
-
Sequence of low priority (LP), 16QAM: QPSK values.
-
Sequence LP, 64QAM: 16QAM values.
Page 48
code
1/4
1/2 4,9764706
2/3 6,6352941
3/4 7,4647059
5/6 8,2941176
7/8 8,7088235
1/2 9,9529412 11,0588235 11,7093426 12,0641711
2/3 13,2705882 14,7450980 15,6124567 16,0855615
3/4 14,9294118 16,5882353 17,5640138 18,0962567
5/6 16,5882353 18,4313725 19,5155709 20,1069519
7/8 17,4176471 19,3529412 20,4913495 21,1122995
1/2 14,9294118 16,5882353 17,5640138 18,0962567
2/3 19,9058824 22,1176471 23,4186851 24,1283422
3/4 22,3941176 24,8823529 26,3460208 27,1443850
5/6 24,8823529 27,6470588 29,2733564 30,1604278
7/8 26,1264706 29,0294118 30,7370242 31,6684492
USER'S MANUAL MO-180
Guard interval
1/8 1/16
5,5294118 5,8546713
7,3725490 7,8062284
8,2941176 8,7820069
9,2156863 9,7577855 10,0534759
9,6764706 10,2456747 10,5561497
1/32
6,0320856
8,0427807
9,0481283
04/2008