Subtending Multiple Systems
48 Avidia System Configuration and Management User Manual
Star Management
In a star configuration, you can attach up to three systems (subtended systems) directly to the
one system that connects on the edge of the network (subtending system). The subtending
system aggregates the traffic from the subtended systems, switches all the traffic (its own and
that of the subtended systems), and provides the network uplink. Features of this management
approach include:
•shorter segment costs rather than the longer length cost of a daisy chain
•more cost effective than running fiber optic cable to new areas or to areas with a small
number ofsubscribers
Each system, whether subtending or subtended, can connect to and manage subscriber traffic
(modems).
“Star Physical Implementation” on page48 shows how to set up a star configuration using
Avidia systems. “Star Configuration” on page50 shows how to configure the system to
implement the appropriate connections.

Star Physical Implementation

The relationship of subtending in a star configuration is shown in the following figure.
Theexample shows an OC3 interface as the network uplink for the entire subtended system. An
AV8000 or AV3000 is the subtending system. Three chassis are subtended and are at three
separate physical locations (sites). The subtending connection is through a DS1 link.
ATM
Switch
Integrated
Access
Server
Internet
OC3
DS1
Site B
Site C
DS1
DS1
Site A
= Subscribers
Avidia 8000/3000/2200
Avidia 8000/3000/2200
Avidia 8000/3000
Avidia 8000/3000/2200
Subtended Subtended
Subtending
Subtended