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In a VOD environment, if the APEX discovers that a program is missing, it stops inserting
the PMT and removes the PMT reference from the PAT. The set-top box then assumes
that the program is missing; this will necessitate a re-ordering of the program.
Unicast and Multicast Loss of Input Stream Processing
The APEX uses the unicast and multicast timeout values (600-6000ms) to determine if
an input stream exists. This is used mainly for RTSP and MHA Session Control modes to
determine when service mapping exists. It is also used for Manual Routing mode to
alarm when an input stream is missing.
Note: These timeout values do NOT apply to UDP Port Mapping mode services.
•
For RTSP and MHA sessions, the unicast timeout value is used for VOD sessions.
The ERM is informed when a VOD service is found or is missing based on the
timeout value. The multicast timeout value is used for SDV sessions. This timeout
value is used to determine if a multicast join was successful or not (reception of a
stream within the timeout period determines success). The loss of input stream via
the multicast timeout is also used to determine when to failover for SDV sessions
setup with redundant streams. A failover to the secondary input stream occurs when
a multicast input stream is determined to be missing (based on the multicast timeout
value).
•
For Manual Routing programs, the timeout values are used to alarm when an input
stream is detected as missing. No failover or other action is taken when an input
stream is missing. The APEX alarms to notify a user that a manually routed stream is
no longer being received.
•
For UDP Port Mapping (VOD) services, the unicast and multicast timeout values are
not applicable. Because UDP Port Mapping sets up static VOD routes, the input
streams are not always expected to be present. Therefore, no alarming is performed
when input streams are missing.
Configuration • System Configuration
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
573408-001-a
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