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If an Input PAT is deemed lost: The APEX1000 will remove all associated output
PMTs and will not forward any component PIDs associated with those input
services. If the input PAT re-appears, the associated output service streams, and
output PMTs will be re-established there on the output.
A PAT associated with a defined output MPTS will always persist, regardless of the
availability of associated input services or PMTs. Maintaining an output PAT prevents the
occurrence of a dead QAM channel (should there be no services currently available to
stream to the output).
CAUTION
This process is not applicable to SDV sessions. SDV sessions have the PAT updated to
contain the PMT reference regardless of the input PSI. (This method reduces the tuning
time when an SDV session is first requested.)
Notes:
1. The APEX1000 maintains the routes associated with lost PMT, for the purpose of
re-establishing the flow of the service should the service re-appear. The same behavior
holds true if the input PMT is missing, even though the associated components may be
there.
2. To reflect the loss of services within the output due to missing PATs or PMTs on the
associated input, the output PAT will be updated accordingly.
Detect Loss of Input PSI Configuration
Use the APEX-EM to enable or disable the detection of loss of input PSI messages.
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If enabled, the aforementioned behavior will take place, due to missing input PMTs
or PATs associated with an output MPTS.
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If disabled, the APEX1000 will not react to missing PSI on the input. In this
eventuality, the current behavior will be maintained, wherein the APEX1000 will
maintain the output PMT and SN references within the PAT, even though the input
PSI is missing.
The APEX1000 EM/SDM allows you to configure the length of time input PSI can be
missing before declaring the service lost. The time interval can be set in one second
increments from a minimum of one (1) second up to 21600 seconds. The default is five
(5) seconds.
VOD Warning
Some VOD servers stop sending PATs and/or PMTs during trick play modes (FFWD,
RWD, or Pause). For this reason, when the APEX is used for VOD, the loss of PSI
detection timeout value must be set to at least ten (10) minutes (600 seconds). This
prevents the APEX from considering the input program missing during a trick play mode.
Configuration • System Configuration
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
573408-001-a
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