The Solution From Bahn Networks

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DAOS Overview

Bahn Networks' Digital Access Optimization System - DAOS is an Ethernet-based DSL system, which provides traditional phone service and high-speed Internet data services through telephone pairs (local loops). It takes advantages of both Ethernet and DSL technologies, enlarges the coverage of Ethernet, and makes Public Ethernet (PEN) possible for today's operators and customers.

Architecturally, DAOS is an extended Ethernet, which uses POTS twisted pairs, instead of CAT-5 cables as physical transmission media, and its coverage can be as far as local loops can reach. Not like traditional local area networks (LANs), the Public Ethernet formed by DAOS, is a network that gives each user the privacy and security as demanded by today's e-business. No user can see other users in the PEN as default. It is also possible, however, to group a few users, who are located in different areas in a city, into a VLAN inside of the PEN. Eliminating ATM mechanism as well as related expensive conversions and reverse conversions between ATM and other protocols in the whole system, DAOS gives service providers multiple benefits: more efficient, high flexibility and capability, and easy management.

Data transmissions in DAOS system are, like in a normal Ethernet, symmetric, i.e., both of downstream and upstream have the same bandwidth. More than not, new broadband Internet services demand as much bandwidth in upstream direction as in downstream direction.

DASO is deployed in the telephone central office. The old phone lines will be re-routed to connect to the DAOS system, then to the CLASS-5 switch. Depending on the requirement, some Ethernet up-links will be needed to connect the public Ethernet to the IP backbone. In the user end, a DAOS-CPE (MODEM) is needed in order to connect to the DAOS system.

A typical DAOS application is shown in Figure -1.

 

Figure 1: A typical DAOS application

 

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