Zhone zNID-GPON-2402 Configuration Manual page 23

All services are configured on a per VLAN basis. The RG interfaces can
configure data, video, and voice.
for all RG VLANs, an integrated Etherswitch is included in the data
forwarding path. This enables RG VLANs to support local Bridging and
peer-to-peer communications for LAN client devices such as PCs.
Additionally, a Bridge Table is maintained for all Bridged RG VLANs to
show learned source MACs per VLAN and per Port.
Packets are classified on ingress, then the learning and forwarding switch
determines where to send. See
forwarding behaviors.
Figure 3: Remote Gateway configured flows
GEM ports in the 5xx - 6xx range are reserved for Residential Gateway traffic
flows.
By default, all RG VLANs map to the 5xx RG GEM. This mapping is not
configurable, and does not require any OMCI provisioning action to create the
5xx GEM on the 24xx unit.
The OLT must not send any OMCI provisioning commands for the 5xx GEM
to the 24xx ONT. The reason is that "OMCI always wins." Whatever
provisioning actions that are specified by OMCI commands will occur. If
OMCI attempts to provision the 5xx GEM, the 24xx ONT will create the
specified ONU traffic flows on the 5xx GEM and disruption to RG traffic
flows may occur.
OMCI vs. Residential Gateway management
VLANS on page 197 for a discussion of layer 2
zNID 24xx Series Configuration Guide
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