Nera WILINK I System Manual page 154

networking device marks the applicable fields. WILINK I also enables marking
data transmitted to the backbone network with either DSCP or 802.1p values,
where the marking is done per Service Profile. This marking overrides marking
performed by external devices behind the SU. Typically, Priority Marking by the
NPU will be used in the following cases:
The external networking equipment behind the SU does not use priority
marking.
The service provider does not trust the priority marking defined by the user's
equipment.
The service provider uses a priority marking type (DSCP or 802.1p) that
differs from the one used by the user's networking equipment.
The system supports three marking modes:
1 Transparent Marking Mode (No Priority Marking): In this case, the system
should forward the frames to the uplink network without any changes.
If 802.1p classification is used at the SU, the frames will be transmitted to the
operator's network according to the following rules:
If VLAN Transparency Mode is Off, the frames will be forwarded with their
original 802.1p value and the configured VPL ID. If no VPL ID is
configured (VPL ID = Null), the 802.1p tags will not be forwarded.
If VLAN Transparency Mode is On, the frames will be forwarded without
any change (with the original 802.1p value and VLAN ID, if exists).
For DSCP classification at the SU:
If the VPL ID is configured (VLAN Transparency Mode Off), the NPU adds
an 802.1Q header with the configured VPL ID and 802.1p=0.
If VLAN Transparency Mode is On, The NPU adds a 802.1Q header with
the original VLAN ID (if exists).
Note that there may be a disparity between the DSCP values and the default
802.1p = 0 value.
2 802.1p Marking Mode:
If VLAN Transparency Mode is Off, all frames are marked with the
configured VPL ID and the 802.1p Marking Value. If no VPL ID is
configured (VPL ID = None), the 802.1Q header will include a VLAN ID = 0.
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