Standardized DVB-T2 RF specifications - DigitalEurope
Standardized DVB-T2 RF specifications - DigitalEurope
Standardized DVB-T2 RF specifications - DigitalEurope
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
FEC Type 64800 64800 64800 64800 64800 64800 64800<br />
Rotated QAM Yes Yes Yes Yes Yes Yes Yes<br />
FEC blocks per interleaving<br />
frame<br />
3 201 201 99 53 201 66<br />
TI blocks per frame (N_TI) 1 3 3 3 1 3 1<br />
<strong>T2</strong> frames per Interleaving<br />
Frame (P_I)<br />
1 1 1 1 1 1 1<br />
Frame Interval (I_JUMP) 1 1 1 1 1 1 1<br />
Type of time-interleaving 0 0 0 0 0 0 0<br />
Time Interleaving Length 1 3 3 3 1 3 1<br />
Design Delay 114053 667232 667232 335371 540324 667471 673827<br />
Additionally FEFs may be enabled and disabled over time and the FEF content may be<br />
changed dynamically. One application of this is to allow interference into the wanted channel<br />
to be measured on a live system. A test for this scenario is described below.<br />
The receiver should be able to continue normal reception throughout these changes of <strong>DVB</strong>-<br />
<strong>T2</strong> signal configuration without requiring a channel rescan, however it is acceptable for the<br />
receiver to re-acquire the channel during the transition phases when FEFs are being enabled<br />
or disabled, causing a brief interruption in reception.<br />
To test receiver conformance, the receiver should be able to acquire and display error free<br />
video without requiring a channel re-scan each time the input is switched from a <strong>DVB</strong>-<strong>T2</strong><br />
signal configured as mode 8, to a <strong>DVB</strong>-<strong>T2</strong> signal configured as shown in Table 19, followed<br />
by switching back to the original mode 8 input.<br />
It is acceptable to have signal breaks during switching if necessary for re-configuring the<br />
<strong>DVB</strong>-<strong>T2</strong> modulator and demodulator, but there should be no picture failures after each<br />
transition phase once the receiver has re-acquired.<br />
Table 19 – Parameters for FEF off/on/off test<br />
Parameter Value<br />
<strong>DVB</strong>-<strong>T2</strong> mode used for testing Mode 8 with N<strong>T2</strong> (number of frames per superframe)<br />
changed from 2 to 6 as shown below<br />
<strong>DVB</strong>-<strong>T2</strong> signal level at tuner input -50dBm<br />
ISSY enabled Yes<br />
FEF enabled Yes<br />
Frames per superframe (N<strong>T2</strong>) 6<br />
FEF P1 S1 value 2<br />
FEF P1 S2 value 1<br />
<strong>T2</strong> P1 S2 value 1<br />
FEF length 520000 samples or 56.875 ms<br />
FEF interval 6 <strong>T2</strong> Frames<br />
FEF content Empty (zero power)<br />
Design Delay 719248 samples<br />
>>15 of 27
Change language