EMS Manual

Generating Standard Events
EMS Manual—426909-005
10-32
Objects to Be Managed
Subsystem ZSAM provides network independent end-to-end reliable transport service
for applications through the X.25 public and private data networks. Access to the X.25
network service is provided by another subsystem.
A local application attaches to a remote application using a dedicated end-to-end
transport connection. It accesses the transport service through one of the subdevices
configured for this subsystem. A maximum of 250 subdevices—which means a
maximum of 250 active transport connections or 250 active application attaches—are
supported at one time.
When a local application first attaches to the subsystem, its user profile—kept on a
user profile tape—is verified before access is granted. When a local application
detaches from the remote application, its usage information—maintained by this
subsystem—is written to a special EMS log (alternate collector).
The subsystem is implemented as a set of persistent processes. The manager process
is a NonStop process pair whose name is configured at system startup. The manager
process is the focal point for operators to control or inquire about objects in the
subsystem.
Objects to Be Managed
Evaluation of ZSAM (Task 2.1) indicates that ZSAM should monitor the availability and
quality of:

Subdevice slots

Local applications

Transport connections

Underlying X.25 network service

User profile tape
Network independent end-to-end
reliable transport service
File System
interface
(another subsystem)
X.25 Network Service
Provider
File System
interface
Application 1
Subdevice-1
Application N
Subdevice-N
Manager
Tape
(user profile)
VST003.vsd