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ATM Subnetwork One or more ATM clusters interconnected using NNI interfaces.
An ATM subnetwork is identified by:
The first 9 bytes of the network prefix, which are the same for
all subnetworks in a Campus Network, plus
A 2-byte routing domain number (RDN), which is unique within
the ATM Campus Network.
ATM Cluster One or more ATM subsystems interconnected using SSI interfaces.
An ATM Cluster is identified by:
The first 11 bytes of the network prefix, which are the same for
all clusters in an ATM subnetwork, plus
A 1-byte ATM Cluster Number (ACN), unique within the ATM
subnetwork, which ranges from 0 to 255.
ATM Subsystem The components of the ATM subsystem in the hub include:
Integrated ATM Switch/Control module functions
Devices connected to the ATM ports
ATM media modules installed
ATM interfaces: user-to-network (UNI), switch-to-switch (SSI),
network-to-network (NNI).
An ATM Subsystem is identified by:
The first 12 bytes of the network prefix, which are the same for
all subsystems in a cluster, plus
A 1-byte Hub Number (HN), unique within the ATM Cluster,
which ranges from 0 to 255.
ATM User Device An end system that encapsulates data into ATM cells and forwards
them to the ATM subsystem across a UNI interface. Examples of
ATM user devices are:
Servers and workstations equipped with ATM adapters
ATM concentrators or workstations equipped with ATM adapters
Routers with ATM adapters
LAN ATM bridges.
3-4 ONcore ATM Switch/Control Module: Installation and User's Guide