User guide

EDA System Design
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Figure 61 EDA Access Network Incorporating a BRAS
10.3.3 Service Selection Using VLAN
The VLAN technology may be used to separate the Access Domain
between Network Service Providers, giving each Service Provider a
logically separated access network with a unique VLAN ID. The Service
Provider has the option of using a BRAS, or an IP router. Subscribers are
associated to a specific Service Provider by configuring the association in
the IP DSLAM between the PVCs and the Service Provider’s VLAN.
It is also possible to define different VLANs for specific services. For
example, a Service Broker may have 10 unique VLANs used for different
services offered to subscribers. One VLAN may provide best effort Internet
access, while another may provide high quality access. Some VLANs may
be used for providing certain contents, such as Telephony over IP, online
games, TV broadcasting etc. This usage of VLAN still supports multiple
Service Brokers within the Access Domain, the difference being that each
can administer more than one VLAN. Figure 62 on page 100 illustrates a
scenario with two Service Providers with their domains separated by VLAN.
Both Service Providers offer data access via an IP router, whilst one of the
Service Providers offers Telephony over IP via a Voice Gateway.