Information About the PMV Support for Table-Based Videos
This feature is used in deployments, where PID allocations are required and allows the operator to configure fixed PID groups for a specific UDP flow. To avail this feature, the operator can choose a specific group of PIDs using a PID map value. The operators can enable this feature at the LEDs that are configured for table-based video sessions.
Overview of PMV
Start PID = PID offset + (PID Map Value x 32)|
Attribute |
Description |
|---|---|
|
Start PID |
Value of the first PID in this specific PID group. |
|
PID offset |
PID value to factor is standard PIDs. The hardcoded value is 48. |
|
PID Map value |
Configurable value for selecting a specific PID group. This attribute can take values from 0 to 251. |
To enable this feature for a table-based QAM, the operator should specify the following details:
-
Whether the operator wants to use this static allocation scheme that is mentioned in this section
-
The actual PID group to pick for a session (PMV)
The PMV is assigned per UDP flow. When a configuration entry with a UDP range is created, the PMV value automatically increments by 1 from the PMV entry corresponding to the first UDP port.
When PMV = 0, PMT PID = 48 + (0 x 32) = 48, the elementary stream PIDs take the values from 49 to 79.
When PMV = 1, PMT PID = 48 + (1 x 32) = 80, the elementary stream PIDs take the values from 81 to 111.
The following table provides an overview of how PMVs are related to the selected PIDs.
|
PMV |
0 |
1 |
... |
251 |
|---|---|---|---|---|
|
PMT |
48 |
80 |
... |
8080 |
|
ES PID 1 |
49 |
81 |
... |
8081 |
|
ES PID 2 |
50 |
82 |
... |
8082 |
|
... |
... |
... |
... |
... |
|
ES PID 31 |
79 |
111 |
... |
8111 |
Prerequisites for Configuring PMV
PMV is applicable only for table-based video sessions. The following prerequisites are applicable for configuring PMV for the sessions.
-
Service Distribution Group (SDG)
-
Virtual Carrier Group (VCG)
-
Bind VCG to SDG
-
Logical Edge Device (LED)
-
Protocol of LED specified as table-based
-
Associate VCG to LED
Restrictions for Configuring PMV
The following restrictions are applicable for configuring PMV for the sessions:
-
This feature is applicable only to the table-based sessions.
-
The PMV feature applies only to SPTS remap sessions, because the MPTS sessions always use pass-through mode.
-
After you configure PMV, it affects only the PID group allocation scheme and does not affect the PID allocation scheme inside a PID group.
-
This allocation scheme is specified at the LED level and is optional. If not specified, the system uses the default LRU-based scheme.
-
If the operator reserves a PID range after the PMV allocates a PID group, it will be handled similarly to that of the existing Least Recently Used (LRU) allocation scheme.
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