User Interfaces
DM240XR High-Speed Digital Modulator
4-10
TM120 – Rev. 1.1
MODE SELECTIONS: {UDP PACKETS, COP 3 RTP, or COP 3 RTP FEC
UDP PACKETS - the modulator accepts generic UDP
packets with seven MPEG packets encapsulated in each
UDP datagram.
COP 3 RTP - the modulator accepts seven MPEG
packets encapsulated in a COP 3 compliant RTP
datagram.
COP 3 RTP FEC- the modulator accepts COP 3
compliant Column FEC packets in addition to the RTP
datagram.
ONLINE SELECT:
{Prime or Backup}
Allows selection and an indication of which UDP port is
currently online.
JITTER BUFFER:
{10 TO 200ms}
Allows the operator to select the jitter buffer depth from
10 ms to 200 ms in 10 ms steps. The Jitter Buffer is
used by the modulator to smooth out the network jitter
that is inherent in Ethernet networks. Entry of zero (no
jitter buffer) is not allowed.
JITTER TRACKING:
{Widest, Wide, Mid Level, Narrow, Narrowest}
Allows the operator to select how the modulator reacts to
and compensates for jitter. Because the modulators
transmit clock is locked to the incoming data stream,
care must be taken when selecting this parameter.
While wider tracking allows larger changes due to
network jitter to be compensated for, it also means that
the receiver will have to track larger, faster, clock rate
changes as the transmit clock is adjusted. On the other
hand, narrower tracking means smaller, slower, changes
in the clock rate but requires more precise network
timing to keep the jitter buffer from over or under flowing.
BACKUP MODE:
{Manual or Automatic)
When manual mode is selected, the modulator will stay
with the selected online port (Prime or Backup) even
when it is not able to lock to the incoming data stream.
When Automatic mode is selected, the modulator will
switch between the Prime or Backup port when it is not
able to lock to one or the other.
BACKUP DELAY:
{100ms TO 5 seconds}
Allows selection of the time to delay in the event of an
online source fault (prime or backup) before switching
over to the other source (backup or prime). Entry is in
100 ms steps from 100 ms to 5 seconds. Displayed
when backup mode is set to AUTO.
Summary of Contents for DM240XR
Page 2: ......
Page 10: ...Table of Contents DM240XR High Speed Digital Modulator x TM120 Rev 1 1 ...
Page 12: ...Introduction DM240XR High Speed Digital Modulator 1 2 TM120 Rev 1 1 ...
Page 16: ...Installation DM240XR High Speed Digital Modulator 2 4 TM120 Rev 1 1 ...
Page 19: ...DM240XR High Speed Digital Modulator Theory of Operation TM120 Rev 1 1 3 3 ...
Page 55: ...User Interfaces DM240XR High Speed Digital Modulator 4 36 TM120 Rev 1 1 ...
Page 67: ...Rear Panel Interfaces DM240XR DVB High Speed Digital Modulator 5 12 TM120 Rev 1 1 ...
Page 69: ...Maintenance and Troubleshooting DM240XR High Speed Digital Modulator 6 2 TM120 Rev 1 1 ...
Page 79: ...Technical Specifications DM240XR High Speed Digital Modulator 7 10 TM120 Rev 1 1 ...
Page 103: ...Appendix A DM240XR High Speed Digital Modulator A 24 TM120 Rev 1 1 ...
Page 124: ...DM240XR High Speed Digital Modulator Appendix B TM120 Rev 1 1 B 21 ...