Ericsson EDA - Manual (Page 7)

The Shared DSL Solution
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The concept of the Shared DSL is using one DSL line inside the Primary
Access Provider network, terminating the line with a Customer Premises
Equipment (CPE) modem that converts the DSL to Ethernet. The Ethernet
is then converted again to DSL by the IP DSLAM to make the DSL
connection to the End-users (this part belongs to the secondary Access
Provider). The concept does not call for any specific equipment in the
Primary Access Provider network, except that it is able to separate and
isolate the data channels coming from the Shared DSL remote site: End-
user data and Management data.
The Concept allows for one type of Quality of Service for both End-users
and management traffic. The limiting factor is the capability of the CPE
modem in the remote site to prioritize traffic. Both types of traffic are
therefore best effort.
The End-user traffic is directed towards public data network (Internet) from
the Router or BRAS of the Primary Access Provider. The Management
traffic is directed toward the EDA network (Access Domain).
The Shared DSL solution requires that the used CPE Modem has the
capabilities of mapping between Ethernet VLANs and ATM Permanent
Virtual Circuits (PVCs).
The Shared DSL Solution supports DHCP option82 (please refer to System
Description for details about the DHCP relay agent in the EDA).
The Shared DSL solution does not support EDA Dynamic Management
VLAN concept (DMV).
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The DMV is a solution for using a different management VLAN (not 246) in the EDA network, with
automatic adaptation of the IP DSLAMs to the management VLAN.