DRAKE 1002366 Introduction

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Brand: DRAKE

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Type: Manual  for DRAKE 1002366

Pages: 4 (0.03 Mb)

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Installation 2
INTRODUCTION
The 1002366 board is used to process the
transport stream after satellite demodula-
tion and before QAM modulation. It
enables the FIXED CLOCK mode of
operation (AUTO CLOCK mode is still
selectable), performs PCR correction, and
it also provides an ASI output of the
demodulated transport stream.
TRANSPORT STREAM PROCESSING
The transport stream processing feature
of the 1002366 board will add null packets
if the SCT860 is set to the FIXED CLOCK
mode and the demodulated transport
stream data rate is less than the rate set
as the fixed output rate. The 1002366 can
also drop extra null packets from the
transport stream when required to obtain
the desired output rate.
The standard SCT860 does not modify the
transport stream - Drake labels this mode
the ‘AUTO CLOCK’ mode as the output
rate is automatically determined by the
received input signal data rate. When the
SCT860, with the 1002366 installed, is set
to the AUTO CLOCK mode setting, it
operates as if the board were not installed;
the null packets will not be processed and
neither dropping or adding will occur.
The 1002366 option board must be
installed into the SCT860, and the
SCT860 firmware must be updated, in
order to activate the FIXED CLOCK mode.
The null packet processing functions are
enabled in the FIXED CLOCK mode. The
AUTO CLOCK mode can still be selected
in the menu.
When the SCT860, with the1002366
board, is set to the FIXED CLOCK
setting, all null packets will be dropped
from the demodulated transport stream.
The rate is then built back up, by adding
1
TM
Model 100-2366 Packet Processing/ASI TS Output Option Board (SCT860)
null packets, to the fixed output QAM
symbol (baud) rate that is set via the front
panel. Dropping null packets is required in
some cases in order to bring the rate
down to or below the desired rate when
the satellite uplink may add extra null
packets.
PCR CORRECTION
The SCT860 performs PCR correction on
the processed transport stream before
QAM modulation when the SCT860 is
used with the 1002366 option and is set
up in the FIXED CLOCK mode. No PCR
adjustments are made when the unit is set
to the AUTO CLOCK mode.
ASI OUTPUT
The 1002366 option board also adds an
ASI transport stream output connector to
the SCT860. A chassis mount type BNC
connector with coaxial cable is provided
for those who have a requirement for this
feature. The ASI output will be the de-
modulated satellite signal transport stream
output, without processing. It is provided in
DVB ASI format.
This output may be used to feed the
satellite signal transport stream to a
multiplexer where part of the stream may
be needed for remultiplexing with another
stream for another output channel.
If ASI output is not a requirement, place
the connector assembly in a storage
location for possible future use.
If the ASI output feature is desired, plug in
the supplied BNC connector cable to the
SCT860 PC board as indicated in Figure 3
and mount the BNC connector in the rear
panel mounting hole. If your SCT860
does not have this hole, it must be added.
The unit can be returned to the Drake
Service Department, if necessary, for this
installation.
INSTALLATION IN THE SCT860
Looking at the SCT860 from the front panel,
observe the right side of the unit.
Remove the three top screws as shown,
three side screws, and three bottom screws
holding the right side of the case.
3 TOP SCREWS
Remove the right side and then lay the
transcoder on a flat surface laying on its left
side.
Locate the 36 pin interface connector and
remove the 11 jumpers that are in place.
Keep these jumpers for future use in case
the 100-2366 board is ever removed.
REMOVE 11 JUMPERS FROM THE 36 PIN CONNECTOR
LOCATION A