Expand Configuration and Management Manual (H06.21+, J06.10+)

Subsystem Description
Expand Configuration and Management Manual — 529522-013
17 - 49
Expand-to-NAM Interface
Expand-to-NAM Interface
This subsection describes how Expand-over-NAM and Expand-over-ServerNet line-
handler processes access a network access method (NAM) interface. The
information presented in this subsection will help you effectively configure, manage,
and troubleshoot an Expand network that includes X.25, SNA, or ServerNet
connections.
Topics described in this subsection include:
•
Network Access Method (NAM) Processes on page 17-49
•
Connection Establishment on page 17-50
•
Sending and Receiving Data on page 17-52
You should be familiar with the information in Expand Line-Handler Processes on
page 17-2, Expand Subsystem and the OSI Reference Model on page 17-9, and
Message Handling and Buffer Allocation on page 17-38 before reading this subsection.
Network Access Method (NAM) Processes
Expand-over-NAM line-handler processes (which include Expand-over-X.25 and
Expand-over-SNA), and Expand-over-ServerNet line-handler processes do not use the
Data Link Layer (OSI Layer 2) services provided by the Expand End-to-End protocol;
instead, these line-handler processes use the Layer 2 services of a NAM process.
The type of NAM process used depends on these type of Expand line-handler process:
•
Expand-over-X.25 line-handler processes use the Layer 2 services provided by an
X25AM line-handler process.
•
Expand-over-SNA line-handler processes use the Layer 2 services provided by an
SNAX/APN line-handler process.
•
Expand-over-ServerNet line-handler processes use the Layer 2 services provided
by the ServerNet monitor process, $ZZSCL.
Expand-over-NAM and Expand-over-ServerNet line-handler processes use the
NETNAM protocol to communicate with the NAM interface of the NAM process that
provides Layer 2 services.
Note. This subsection refers to modifiers that allow you to control various aspects of the
Expand-to-NAM interface. For more information on these modifiers, see Section
16, Expand
Modifiers.