User manual

User Manual
Chapter 10. Stat-Mux
Page 10-2 P/N 2349-72712-01
10.2.2. NMS and STAT-MUX Controlled System
Figure 10-2 illustrates the same example as above using the SM-3000. The NMS-4000 sends
the SM-3000 information such as the maximum available bit rate of the Mux. The NMS-4000
informs the SM-3000 that the maximum available bit rate is 35Mbps. The SM-3000
continuously monitors the varying output quality of the encoders, applies an algorithm to
determine the optimum division between the encoder bit rates.
Figure 10-2: STAT-MUX Variable Bit Rate Control Example
~10% of max
available bit rate
a single
freezed
frame
News
Broadcast
action
movie
~30% of max
available bit rate
~60% of max
available bit rate
35 Mbps
Control
Max Bit Rate = 35 Mbps
NMS
Control
Control
Control
Variable Bit Rate (VBR)
Variable Bit Rate (VBR)
Variable Bit Rate (VBR)
STAT-MUX
10.3. Mode of Operation
The NMS-4000 interfaces and interacts with the SM-3000 in the following ways:
• The NMS-4000 has access and has control over all the devices in the system and can
accurately and automatically calculates the maximum available bit rate of the multiplexer,
taking into account all the parameters and changes in the system. The maximum
available bit rate is no longer needed to be calculated manually in the STAT-MUX
screen.
• The NMS-4000 has a graphical user interface for adjusting the encoder parameters to
work in VBR mode. When the encoder parameters change, the NMS-4000 automatically
notifies the SM-3000 of the change.
• The NMS-4000 has an overflow protection. It uses the SM-3000 to check for an overflow
when a parameter is changed in the system and warn the user before changing the
parameter should an overflow might occur.