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What is DSL?
What architecture does NEXTEP use?
What is a DSLAM?
Firewalls
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What architecture does NEXTEP use?
The NEXTEP network is open-architectured and protocol/application
independent to allow both service provider and user flexibility.
It is aimed to allow network users to define their operational
requirements without the network being a limiting factor.
In designing the network, primary consideration was given
to reducing installation expenses and ongoing operations and
maintenance costs. To achieve this, NEXTEP has reduced network
complexity while achieving superior service delivery.
Network Connections
The network architecture consists of central nodes and distributed
hubs that are connected using an asynchronous transfer mode
(ATM) network, which allows single point-to-point connections
between nominated locations.
A central node is located in each state and provides interfaces
to Internet service providers (ISPs) that wish to utilise
the NEXTEP Broadband to provide value-added services to customers.
A data switch is located in the central node, providing Layer2/3/4
switching for multipoint connections and quality of service
(QOS) based on circuit or application requirements.
Traffic shaping is performed at the central node locations
for all service connections.
The central node locations are connected to individual DSLAMs
which are, in turn, connected to unconditioned local loops
(ULLs), allowing data transfer to customer premises using
ADSL technology.
At the customer premises, connection to the network is through
a 10BaseT (Ethernet) connection on the user ATU modem.
ISP Applications
An ISP can operate services and applications independently
on the network or nominate configuration requirements for
the network. The network will transparently support all traditional
broadband network services and protocols.
Customer Premises Connections
The standard connection at the customer premises is based
on RFC 1483B local area network (LAN) bridging. The support
for this protocol reduces installation requirements at customer
premises and provides maximum flexibility for customer systems.
It is not dependent on customer PC hardware or software and
requires no special configuration. The network will support
other network protocols such as PPeE, PPoA, RFC 1483R etc,
where required by ISPs.
Business Data Interconnect
All NEXTEP business data interconnect services allow customers
to connect multiple locations using transparent IEEE 802.3
LAN bridging.
The customer's computer equipment is connected via Ethernet
to an ATU modem. The Ethernet traffic is
encapsulated into ATM cells for transmission over ADSL
to the DSLAM located in the local
telephone exchange.
The DSLAM performs an ATM cross-connect function where the
customer traffic is switched onto a VPI/VPC circuit for connection
over the ATM network to a centralised node location.
At the central node, an ATM switch is used to switch traffic
on the ATM layer to a VPI/VPC circuit for connection to a
transmission link to either another DSLAM or to a centralised
node location in another state.
This is shown in the diagram.
Business Internet Access
All NEXTEP Internet access services are configured much the
same as a business data interconnect, the only difference
being that the ATM switch at the central node directs traffic
on the ATM layer to VPI/VPC circuits for connection to a transmission
link to the ISP.
This is illustrated in the diagram.
ADSL Transceiver Unit (ATU)
The ATU is a high-speed modem supplied and installed by NEXTEP,
and is connected to your PC or network server using an Ethernet
or USB cable.
Using the high-speed ADSL service, the ATU provides NEXTEP
Broadband Internet access, remote office networking, and business
system access for telecommuters.
The ATU is plug-and-play, typically requires no configuration,
and is maintained by NEXTEP.
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