Operating instructions

DVB3030/DVB3030L Digital Video Broadcast Modulator User Interfaces
TM052 - Rev. 3.5 4-9
4.2.3 Interface Menu Options and Parameters Menu
There are eight Interface Screens available (Refer to Figure 4-6). These include:.
1. Type: {Serial, Parallel, ASI, G.703, HSSI}
Enter the terrestrial interface type.
Note: Interface types that have not been ordered may not be selected.
2. Clock Invert: {Normal, Inverted}
Inverts the terrestrial data clock. This is the same as
Clock. Invert under the Modulator Menu.
3. Data Invert: {Normal, Inverted}
Inverts the terrestrial data stream. This is the same as
Data Invert under the Modulator Menu.
4. Data Clock Select: {SCT, SCTE}
SCT: Data clock is supplied by DVB modulator
internally.
SCTE: Data clock is supplied by user equipment to
DVB modulator.
Note: The Transmit Clock (SCT) supplied by the DVB3030 is always Output. Normally,
this clock is used to clock the data out of the data source and then return it to the SCTE
pins of J9. The DVB3030 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. This mode is NOT recommended except for testing or fault
backup.
5. EXT CLK OUT: {SCT, SCTE, NONE}
Selects the source of clock output from the G.703
Interface. For Serial or Parallel, the selection is ‘SCT’
and for ASI, it is ‘NONE.’
6. Freq Ref Src: {Internal, External}
Selects the frequency reference source.
7. Ext Ref Freq: External Reference Frequency: Enter the external
reference frequency in 8 KHz steps from 1 MHz to 10
MHz.
8. Framing Mode: {None, 188, 204}
Selects the number of bytes per incoming data frame, or
unframed data.
Note: ‘None’ is unframed data