Non Block Aligned linearization is dealt with in Annex A of the ProMPEG Code of
Practice. In Non Block Aligned the matrix is ‘skewed’ for the column calculation. The
L column FEC packets are played out at the end of every column plus a constant.
For ‘square’ matrices (diamonds) where L = D then these column packets will
emerge at regular intervals. For ‘rectangular’ diamonds they will not. In the case of a
4 column by 20 row matrix the 4 FEC packets will emerge within 16 slots, followed
by a gap of 64 slots before the next 4. It therefore produces a less linear spread of
packets.
Receivers which do not have FEC capability can simply ignore the FEC packets and
just make use of the media packets.
5.5.4.5 VLAN Tagging
VLAN tagging can be used to segregate IP packets from data interfaces.
5.5.4.5.1 VLAN Creation
A VLAN is created by specifying the VLAN ID, IP address and the Netmask. All
Transport Streams which are tagged to this VLAN use the VLAN IP address as its
source IP address. Hence the VLAN and VLAN ID must be created before it can be
used to tag a Transport Stream.
To create VLANs, on the Advanced Setup tab of Device Configuration page
navigate to the Encoder > Vlan Tags folder, select the output you want to assign
the VLAN tag to, and click Add in the Properties pane. Alternatively, on the front
panel navigate to Advanced/System/Vlan Tags and set up the VLANs as required.
The available options are listed in the following table.
Table 5.65 VLAN Creation Options
Parameter Values Description
Vlan ID (Create) 2-4094 New VLAN ID to create.
Vlan IP xxx.xxx.xxx.xxx
VLAN IP Address (VLAN tagged Transport Stream will have this as
its source IP address).
Vlan Netmask yyy.yyy.yyy.yyy VLAN Netmask.
Vlan Gateway zzz.zzz.zzz.zzz VLAN gateway address for the current VLAN.
Note: The VLAN Id and its IP address must be unique across all Ethernet
interfaces.
VLAN Tag Sharing
Once the VLANs are created, they can be assigned to IP Transport Streams. To do
that, navigate to Service Configuration page, and create a Transport Stream for
the appropriate IP output. Then, click on the newly created Transport Stream, and in
the Properties widget select the required VLAN tag. VLANs can also be assigned to
Transport Streams in the Outputs/IP Output <m>/Data Interface Group
<n>/Transport Stream ID: <id>/Destination List/Destination <k>/Vlan Tag front
panel menu. The following options can be set:
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