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LTP-8X optical line terminal
75
Thus, the model implements "VLAN for Service" for VoIP, Internet, and IPTV unicast services and TR-069
service.
19.4
Model 3
Consider a model 3 implementation 3.The chart of this service model is shown in Fig. 19.5.
Dedicated S-VLANs are used between OLT and service routers (BRAS, VoIP SR) for each of the following
services: VoIP, Internet, IPTV unicast, and TR-069. These S-VLAN are global for all subscribers (ONT).
Corresponding GEM ports are created for every OLT service between ONT and OLT. A dedicated MC-
VLAN is used for multicast transmissions.
VoIP, Internet, and IPTV, and TR-069 unicast services are associated with S-VLAN in ONT. ONT transmits
S-VLAN into a corresponding U-VLAN for each service. ONT associates the U-VLAN with corresponding
ONT interfaces or program modules. For example, a TR-069 service is associated with a TR-069 client
with the help of a corresponding interface. VoIP, Internet, and IPTV unicast services can operate in the
"router" or "bridge" modes depending on ONT configuration. The chart shows all services configured in
the "router" mode.
All broadcast and unknown unicast traffic is redirected to a dedicated broadcast GEM port in this model.
Broadcast and unknown unicast packets come to S-VLAN in ONT. These packets are transmitted into the
corresponding U-VLANs on the ONT side. In this case broadcast and unknown unicast are replicated
neither in OLT nor in ONT since every service has a separate S-VLAN for broadcast and unknown unicast
traffic.
Fig. 19.5. Service Model 3 Chart
Thus, the model implements "VLAN for Service".