Introduction to SNA Capabilities of Tandem NonStop Systems

Introduction to SNA Capabilities of Tandem NonStop Systems–134597
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Connections
This section describes the ways in which a Tandem NonStop system can be connected to
SNA equipment—the types of SNA node to which it can be attached, the types of line
connection and electrical interfaces supported, and the Tandem controllers required.
Node Attachments
Table 3-1 shows the types of node to which a Tandem system, running each access
method, can be directly attached.
Sharing Lines for Type 2.0 and 2.1 Nodes
SNAX/APN and SNAX/XF share a common line-handler process, so multidrop lines
can be shared by type 2.1 nodes (supported by SNAX/APN function) and type 2.0 nodes
(supported by SNAX/XF function). This is illustrated in Figure 3-1.
Table 3-1. Node Attachments Supported by Each SNAX Access Method
Node Type SNAX/XF SNAX/APN SNAX/CDF
SNA host (type 5 node) Yes (note 1) No No
SNA communication controller (type 4 node) Yes Yes Yes
Cluster controller and other type 2.0 nodes Yes No No
Type 2.1 nodes No Yes (note 2) No
Notes.
1. Attachment to an SNA host requires that the host have a Token-Ring adapter or channel gateway.
2. For communication across an APPN network, the Tandem system must be attached to an APPN node.