ATM Configuration and Management Manual

Overview of the ATM Subsystem
ATM Configuration and Management Manual—522307-003
2-5
System-Level Processes and Libraries
Figure 2-2 shows the relationship between the elements of the ATM subsystem. These
elements are described in the following subsections.
System-Level Processes and Libraries
The ATM subsystem uses the shared-memory segment provided by the QIO
subsystem to move the ownership of data between processes. (For more information
about QIO, see the QIO Configuration and Management Manual .) The subsystem also
uses QIO-based driver/interrupt handlers (DIHs) to communicate to the appropriate
adapter type over the ServerNet SAN. The driver controls the ServerNet adapters
through a set of system-library routines accessible by each process that needs to use
the ATM subsystem.
ATM Service Providers
ATM (Asynchronous Transfer Mode) service providers are processes that use the ATM
subsystem to send and receive data on ATM networks attached to the system. TCP/IP
is the only ATM service provider currently supported.
Figure 2-2. ATM Subsystem Architecture
TCP/IP
AMP ASM
SVC
PVC
SVC
PVC
ServerNet SAN
Adapter Adapter
ATM Drivers and DIH
QIO Subsystem
VST202.vsd