Expand Management Programming Manual

INTRODUCTION
Architecture of the EXPAND Subsystem
You can communicate with the EXPAND subsystem through both
interactive and programmatic interfaces. The interactive inter-
faces to the EXPAND subsystem are the following:
• The Subsystem Control Facility (SCF), which you can use to
configure, control, and collect information from the EXPAND
subsystem. SCF communicates with the EXPAND manager process
through the Subsystem Control Point (SCP), a programmatic
command interface that is described below. The EXPAND
manager process, in turn, communicates with the line-handler
processes.
SCF commands are similar to those of CMI, described in the
following paragraph; but SCF includes some functions that are
not available through CMI or the other interactive interfaces
described below.
• The Communications Management Interface (CMI), which you can
use to configure, control, and collect information from the
EXPAND subsystem. CMI communicates with the NCP, $ZNUP, and
the line-handler processes.
• The Network Monitor (NETMON) utility program, which allows you
to obtain information about the current state of the network.
NETMON communicates only with the NCP and $ZNUP.
• The Communications Utility Program (CUP), which allows you to
obtain statistics and status information about EXPAND lines
and paths; alter the attributes of lines, paths, and line-
handler processes; and stop lines and paths. CUP communicates
with the NCP, $ZNUP, and the line-handler processes.
• The Peripheral Utility Program (PUP), which allows you to
bring line-handler processes up or down, switch the NCP
or line-handler processes between processors, and list the
attribute values of devices on the network. PUP communicates
with the NCP and the line-handler processes.
The programmatic interfaces available to the EXPAND subsystem are
the following:
• The control-and-inquiry interface, which allows an application
to configure, control, and collect information from the EXPAND
subsystem by sending requests to and receiving responses from
the subsystem. Requests are sent to the EXPAND manager
process through the Subsystem Control Point (SCP), and the
EXPAND manager process forwards the requests to the line-
handler processes.
• The Event Management Service (EMS), which allows an applica-
tion to obtain notification of events reported by the NCP and
the line-handler processes.
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