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User Interfaces
OUTCLK SRC
OUTCLK POL
REF FREQ SRC:
EXT REF ( MHz):
The Transmit Clock (SCT) supplied by the DM240 is always Output.
Normally, this clock is used to clock the data out of the data source and
then return it to the SCTE input. The DM240 is then set to SCTE mode
eliminating any possible clock skew. Alternately, the data source can
generate the SCTE clock internally and the SCT signal can be ignored. If
SCT mode is selected, the Modulator data clock will not be locked to the
incoming data stream.
testing or fault backup.
4.2.4 RF Switch Menu Options and Parameters
REDUNDANCY MODE:
ACTIVATE PRIME
ACTIVATE BACKUP
(BACKUP|PRIME) STATUS:
FAULT TEST:
4-10
DM240-DVB High-Speed Digital Modulator
{SCTE, SCT}
When used with G.703, the user may choose between
an internal (SCT), external (SCTE), or no output clock
sources. All else provides status only.
{NORMAL, INVERTED}
Output Clock Polarity – Allows the user to use the output
clock signal as is or to invert it.
{Internal, External}
Reference Frequency Source – Allows the user to select
either an internal or external reference source.
External Reference Frequency:
Enter the External Reference Frequency in 8 kHz steps
from 1 MHz to 10 MHz.
This mode is NOT recommended except for
{MANUAL, AUTO REVERT, BACKUP}
Indicates the mode of operation for the RF redundancy
switch.
Pressing ENTER causes the prime side of the RF switch
to be selected as online.
Pressing ENTER causes the backup side of the RF
switch to be selected as online.
{NORMAL, FAULT}
This is the status of the other DM240 connected to the
RF switch.
{NORMAL, FAULT}
Asserts the fault signal to the RF switch for testing
purposes.
TM083 - Rev. 3.0
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