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Network Service Provider
ISP Router
Internet
Router
Corporate
Intranet
8000-A2-GB21-20
The following illustration shows a detailed view of the network model:
Network Access Provider
Access to
Point-of-
Presence
WAN
Access to
Point-of-
Presence
WAN-C
(Router or
VLAN Switch)
The Service Subscriber is the user (or set of users) that has contracted to
receive networking services (e.g., Internet access, remote LAN access) for
the end-user system from one or more Network Service Providers (NSPs).
Service Subscribers may be:
— Residential users connected to public network services (e.g., the Internet)
— Work-at-home users connected to their corporate Intranet LAN
— Commercial users at corporate locations (e.g., branch offices) connected
by a LAN to other corporate locations or connected to public network
services
RTUs must be installed at the customer premises to provide the Service
Subscriber access by way of DSL to any of the above services.
The Network Access Provider (NAP) is typically the network provider (e.g.,
a Regional Bell Operating Company, an Alternate Local Exchange Carrier)
that has access to the copper twisted pairs over which the DSL-based
service operate. The NAP provides a transit network service permitting
connection of service subscribers to NSPs.
November 1997
Introduction to the HotWire DSLAM
Wire
Center
Wire
Center
Wire Center
DSLAM
Service Subscriber
RTU
RTU
RTU
DSL
RTU
RTU
97-15499-02
1-13
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