HP-UX SNAplus2 R7 General Information

Introducing SNAplus2

SNAplus2 Resources

Figure 2–2 TN Server

TCP/IP Network

Host

SNA Node

Running TN Server

Clients Running TN3270

and TN3270E Programs

SNA Nodes Running

3270 Emulators

SNA Node

TN Server Configuration TN3270 Program View

of the Configuration

TCP/IP Network

Host

Clients Running TN3270

and TN3270E Programs

Host

Host View of the Configuration

TN server provides an association between a TN3270 user and a 3270 LU on the SNAplus2 server. All data from

the TN3270 user is routed to the LU. This means that the conﬁguration for both the host and the TN3270 user is

as though they were connected directly; neither needs to be aware that data is being routed through TN server.

SNAplus2 TN server supports all TN3270 client emulation programs that correctly implement the protocols deﬁned

in RFCs 1123, 1576, 1646, and 1647. The separate TN3270 product supports 3270 and 3179G emulation over a

TCP/IP network.

2.2.4 Client/Server Support

Computers running SNAplus2 can be conﬁgured to communicate using client/server protocols. When client/server

protocols are used in a network, all the computers using client/server protocols to communicate in that network

are referred to as a “domain.” Each computer in the network speciﬁes the same domain name when SNAplus2 is

installed.

The computers running SNAplus2 in a client/server conﬁguration can take the following roles:

• A server contains an SNA node and its associated connectivity components. The server provides SNA

connectivity to applications on the local system or on other machines in the same domain. Servers must

be HP-UX systems.

• A client does not contain SNA node components, but accesses them through a server. A client can access one or

more servers at the same time, and can run concurrent applications as needed. Clients can be running HP-UX or

Windows.

Servers and clients communicate across the SNAplus2 domain using TCP/IP. The protocols used are different from

those used by TN3270 and support a wide range of applications, including 3270, 5250, RJE (HP-UX clients only),

and applications using the SNAplus2 APIs.