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Chapter 25.
Service Models
This chapter considers main terms and classification of service models.
Introduction
In general, a service model is based on a method, which describes how the services are
provided: "VLAN for Subscriber" or "VLAN for Service". The "VLAN for Service" architecture means
that a service VLAN (S-VLAN) is used to provide all users with a certain service. The "VLAN for
Subscriber" architecture, in its turn, implies that a client VLAN (C-VLAN) is used to provide a user
with multiple services. These methods are often combined in practice and form a hybrid model,
which uses S-VLAN and C-VLAN simultaneously.
"VLAN for Subscriber" Architecture
A separate VLAN is used for each subscriber in the C-VLAN model. A dedicated C-VLAN is used
to provide services to each user between the OLT and service routers. Service GEM ports are
created for every OLT service between every ONT and the OLT. When a service request is
generated upstream, records are added to the MAC table in the OLT according to C-VLAN. In case
of downstream traffic, a corresponding GEM port is determined for a definite service according to
the MAC table in the OLT.
If the destination address of the downstream transmission is unknown (broadcast or unknown
unicast), i. e. the GEM port cannot be determined, two options are available:
—
transmission through a dedicated broadcast GEM port;
—
transmission to all GEM ports, which correspond to the services provided to the subscriber.
The destination address, in case it is unknown (broadcast or unknown unicast), will be
determined based on the method implemented in a definite service model.
The architecture of this service model is shown in Fig. 25.1.
Summary of Contents for LTP-4X
Page 11: ...11 Part I General ...
Page 29: ...29 Part II Getting Started with the Terminal ...
Page 37: ...37 Part III Configuring the Terminal ...
Page 98: ...98 Part IV ONT Configuration ...
Page 174: ...174 Part V Terminal Monitoring ...
Page 189: ...189 Part VI Terminal Maintenance ...
Page 191: ...191 Step 2 Remove the module from the slot Fig 43 4 Removing SFP Transceivers ...
