Receiver Delay Mode And 4:2:2 Decoder Option Card; Achieving Minimum System Latency With The Ericsson Avp 2000/3000 - Ericsson RX8000 Reference Manual

•
•
•
The user can override the pre-defined delay settings with user-defined delay values.
The value range for the user-defined delay is defined below. To achieve a lower
user-delay value, the Low Delay License option must be enabled.
Table 3.21 User-Defined Delay Value Ranges
Low Delay License
(RX8200/SWO/LDELAY)
Disabled
Enabled
Note: Using a user-defined delay value of less than zero breaks the MPEG buffer
3.13.5.7

Receiver Delay Mode and 4:2:2 Decoder Option Card

Where the 4:2:2 Decoder option card is fitted, it is possible to manipulate the
RX8200 to use the 4:2:2 Decoder for 4:2:0 video formats rather than the default
Base Decoder.
Setting the Rx Delay Mode to Low, Mega Low or User Defined will force the RX8200
IRD to use the 4:2:2 Decoder regardless of whether the video is 4:2:2 or 4:2:0
format. However, this only occurs if the 4:2:2 Decoder card supports the video and
coding format.
3.13.5.8

Achieving Minimum System Latency with the Ericsson AVP 2000/3000

When the Ericsson RX8200 IRD is coupled with the Ericsson AVP 2000 or AVP
3000 Voyager, a very low end-to-end delay is achieved. The RX8200 IRD must be
configured so that the Rx Delay Mode is set to Mega Low and the 4:2:2 VSync
Lock option is Enabled.
For minimum system latency the Ericsson AVP should be set up as follows:
EN/LZT 790 0005 R7A
will be used for 4:2:0 decodes unless a compatible 4:2:2 Decoder option card is
fitted. The Rx Delay Mode must be set to User-defined for this to take effect.
Refer to Table 3.21 for range of possible values.
Rx Delay 4:2:2 – This allows the user to define the additional system delay to
be applied to the receiver when the 4:2:2 Decoder Option card is being used. If
the fitted 4:2:2 Decoder Option card is compatible with the video standard it is
used in place of the Base Decoder for 4:2:0 decodes, as well as 4:2:2 decodes.
The Rx Delay Mode must be set to User-defined for this to take effect. Refer to
Table 3.21 for range of possible values.
Rx Delay Override (MPEG-2) – Enabling this option overrides the Rx Delay
Mode selection to Compatibility for MPEG-2. It does not affect H.264 settings.
422 VSync Lock – When enabled, this configures the 4:2:2 Decoder Option
card to minimize the system delay by ensuring the picture output time (as
determined by the PTS) is within 5 ms of the output's Vertical Sync signal. When
used with the Mega Low setting of the RX Delay Mode this will provide the
lowest possible end to end delay.
model for the transmission, care must be taken when attempting this.
Maximum User Delay
Setting
+500 ms
+500 ms
Using the Equipment
Minimum User Delay
Setting
+250 ms
-100 ms
3-223