Operating the Equipment Locally: Output Menu - Descriptor Type = Terrestrial
Page 4-102
Reference Guide: Voyager E5784 and E5788 HD DSNG Encoder
ST.RE.E10137.3
FEC (HP) and FEC (LP) Options
Access the FEC (HP) or the FEC (LP) option from the
Delivery
Descriptor Menu
. These screens enable the inner FEC schemes used by
the terrestrial transmitter to be specified.
NOTE…
If the Hierarchy option is set to Non-Hierarchical, then only the FEC Rate parameter is used and
shown on the display.
If the Hierarchy option is set to Alpha=n, then the FEC (HP) and
FEC (LP) parameters provide two levels of modulation. Transmission
starts with the code rate for the HP level of modulation and ends with the
code rate for the LP level.
The screen for the FEC (LP) option is the same except that (LP) replaces
(HP).
Table 4.116: FEC (HP) and FEC (LP) Options
Selected Option
Description
1/2
Terrestrial transmitter FEC rate HP/LP is 1/2.
2/3
Terrestrial transmitter FEC rate HP/LP is 2/3.
3/4
Terrestrial transmitter FEC rate HP/LP is 3/4.
5/6
Terrestrial transmitter FEC rate HP/LP is 5/6.
7/8
Terrestrial transmitter FEC rate HP/LP is 7/8.
Guard Interval Option
Access the Guard Interval option from the
Delivery Descriptor Menu
.
This enables the guard interval of the terrestrial transmitter to be
specified.
Table 4.117: Guard Interval Options
Selected Option
Description
1/4
Terrestrial transmitter guard interval is 1/4.
1/8
Terrestrial transmitter guard interval is 1/8.
1/16
Terrestrial transmitter guard interval is 1/16.
1/32
Terrestrial transmitter guard interval is 1/32.
Carriers Options
Access the Carriers option from the
Delivery Descriptor Menu
. This
enables the transmission mode (i.e. number of carriers in an OFDM frame)
used by the terrestrial transmitter to be specified.