Cisco Model D-PCG1000 PowerKEY CAS Gateway Maintenance Manual
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Chapter 3 Check QAM Device Operations
20
4019476 Rev C
Stat Mux Dejitter Groups on GQAMs
Use the following quick path to access the Stat Mux Dejitter Groups GUI on the
DNCS.
Quick Path:
Quick Path:
DNCS Administrative Console > DNCS tab > Network Element Provisioning tab
> QAM > File > New > GQAM > Advanced Parameters tab > Stat Mux Dejitter
Groups: Set up
Statistical multiplexed dejitter groups (SMDGs) are used on GQAMs that receive
Statistical multiplexed dejitter groups (SMDGs) are used on GQAMs that receive
input from a statistical multiplexor (stat mux). SMDGs identify each GQAM input
and output that will carry the multiplexed source and also allow the modulator to
appropriately process the multiplexed sources. After setting up SMDGs, you can set
up sessions for groups to carry.
The SMDG provides the following functions:
The SMDG provides the following functions:
Processes the variable bit rate (VBR) stream as a group of programs
Ensures optimum dejitter by using one buffer that is dedicated to only one
transport stream
Produces an output stream closer to the received jitter
Processes the SMDG as a session, so it can be created and torn down as needed
Important:
Setting up an SMDG enables the GQAM modulator to appropriately process
multiplexed sources. Failing to set up SMDGs on GQAM modulators that receive
multiplexed sources may result in tiling (macroblocking) of the video on DHCTs.
If you are using a GQAM modulator that receives input from a statistical
multiplexor (stat mux) to send multicast sessions to the network and you already
added SMDGs to the DNCS and created a source for the session, follow the
procedure to set up multicast sessions on the GQAM SMDGs. You can set up a
maximum of 60 sessions on an SMDG.
SMDG sessions must use the same input port and output port that the SMDG
uses. Otherwise, the session may fail.
See Dual SFP Gigabit QAM Modulator Installation and Operation Guide (part number
4014102) for detailed configuration procedures.