Expand Configuration and Management Manual (G06.24+)

Subsystem Description
Expand Configuration and Management Manual—523347-008
18-49
Expand-to-NAM Interface
Expand-to-NAM Interface
This subsection describes how Expand-over-NAM, Expand-over-ServerNet, and
Expand-over-FOX 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,
ServerNet, or FOX connections.
Topics described in this subsection include:
•
Network Access Method (NAM) Processes on page 18-49
•
Connection Establishment on page 18-50
•
Sending and Receiving Data on page 18-52
You should be familiar with the information in Expand Line-Handler Processes on
page 18-2, Expand Subsystem and the OSI Reference Model on page 18-9, and
Message Handling and Buffer Allocation on page 18-38 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), Expand-over-ServerNet, and Expand-over-FOX 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 the type of
Expand line-handler process as follows:
•
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-FOX processes use the Layer 2 services provided by the FOX
monitor process, $ZZFOX.
Expand-over-NAM, Expand-over-ServerNet, and Expand-over-FOX 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 detailed information about these modifiers, refer to Section 17,
Expand Modifiers.