Cisco Headend System Release 2.5 설치 가이드
Chapter 1 Introducing the Common Download SoftMux Solution
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4017307 Rev C
Common Download and Object Carousel on
TSBroadcaster
Overview
Currently, the ocdlManager gives the ASI card a Program Map Table Packet
Identifier (PMT PID) value on which to build the download stream. The ASI card
then builds the download stream with a PMT PID of the value given and an
elementary stream with the PMT PID into the Common Download version table
(CDVT). The host expects that the PID value in the CDVT is the actual value of the
elementary PID, not the PMT PID. Therefore, the host cannot find the download
image data.
In the short term, the workaround involves setting the PMT PID for ocdlManager to
In the short term, the workaround involves setting the PMT PID for ocdlManager to
150 or another available value on the TSBroadcaster. The new setting causes the ASI
card to build a PMT with PID 150 and an elementary stream with a PID value of 151.
The ocdlMgr inserts the PID value 150 into the CDVT. The MUX can then be
configured to remap PIDS 150 and 151 down to 149 and 150. So, the CDVT value
appears to point to the download image elementary stream. The SoftMux solution
corrects this issue.
Notes:
Notes:
Use CAQAM software version 2.5.1 or later, or MQAM software version 2.6.10 or
later. (QAM version 2.4.0 will not save the pass-through mode in the NVMRAM.
If, for any reason, the QAM reboots, pass-through will need to be re-enabled
through the craft port.)
The ocdlManager issues are resolved in DNCS software version 4.0 SP1 or later
(including all related software patches). In versions earlier than DNCS 4.0 SP1,
the ocdlManager process has a dependency for an active session before pumping
any data out of the ASI card. If the ocdlManager process is restarted, the QAM
needs to be taken out of pass-through mode in order for an active session to
come up on the DNCS.
TSBroadcaster with OCAP Object Carousel and Common Download
In the following drawing, both the OCAP Object Carousel and the Common
Download Carousel are on the TSBroadcaster. The objective of this scenario is to
ensure that the Common Download and Object Carousel are unaffected when
combined and transmitted through a pass-through QAM.