User guide

EDA System Services
40 1/1551-HSC 901 35/3 Uen C 2005-12-02
6 EDA System Services
EDA is a versatile and flexible system, and can be designed to fit various
requirements regarding service access, network architecture, and network
performance. Furthermore the EDA system solution can be adapted to
various requirements regarding scalability and redundancy.
This section gives an overview of the services that can be provided by the
EDA system.
6.1 The EDA Services
An EDA Service is a set of rules and properties, which defines how traffic is
handled to and from an End-user through the aggregation network. A
Service always has a Service Identifier that defines how to identify traffic of
the specific Service.
The EDA Service should not be confused with a service offered by Service
Providers as for example Internet connection, IP Telephony, IP video
services and so on. The EDA Service defines properties such as
associated VLAN, PVC, CPE Access Method and more. Thus the Service
Provider provides the contents of the service, while the EDA Service
provides the means to access the contents, with a defined bandwidth. The
Quality of Service is the part of the rules, which defines the desired
transport quality with respect to for example packet loss and delay.
The rules are applied to each frame, thus enabling the End-user to reach
specific Service gateways or servers, and with the desired quality.
A key requirement of an access network is to impose service access
constraints, that is, ensure that access is allowed only to services for
which the End-user is authorized. In traditional broadband access network,
this task is ensured by a Broadband Remote Access Server (BRAS). The
BRAS is a single node through which all traffic must flow. The BRAS is
located at the border between the aggregation network and the application
servers or external network like the Internet.