Comtech EF Data DD240XR Rev Е - Manual (Page 28)

User Interfaces DD240XR High-Speed Digital Demodulator
4-8 MN-DD240XR – Rev. E
TERR FRAMING:
{None, DVB 188, DVB 204}
Terrestrial Framing – Allows the user to choose framing
packet. None equals 187 framing.
When configured with an Ethernet Interface, TERR FRAMING is always 188 framing.
TERR STREAMING:
{Byte Output, Packet Output}
Only applies when ASI interface is installed
DATA POLARITY:
{NORMAL, INVERTED}
This allows user to invert the data.
CLOCK POLARITY:
{NORMAL, INVERTED}
(This menu is not displayed when ASI interface is
installed)
Rx Clock Polarity – Allows the user to specify the clock
sense. This should be set the same as the Modulator
Source.
BUFF CLOCK SRC:
{RX SAT, EXC DIR, EXC REF PLL}
When G703 Interface is installed the Buffer Clock
Source options are below are available. All other
interfaces may display RX SAT.
RX SAT - Clock is recovered from the satellite data
transmission.
EXC DIR – Clock is provided by an external clock
source. Not all terrestrial interfaces include a Doppler
buffer.
EXC REF PLL – Clock is provided by an external clock
source and passed through a phase locked loop. Not all
terrestrial interfaces include a Doppler buffer.
RX SAT Clock is the standard clock with most interfaces. External clocks are available
only if the interface is buffer capable. If the interface is not buffer capable, the EXC
Options (BUFF CLK SRC, EXC REF CLOCK, RX BUFFER SIZE, and RX BUFFER RESET)
will not be displayed.