Introduction to SNAplus2
SNAplus2 Components
at the downstream computers are configured as part of the resources of the SNAplus2 computer. The host computer is not aware that PU concentration is being used.
Dependent LU Requester. This section does not apply to LEN nodes.
In addition to providing direct access to a host computer, SNAplus2 can provide dependent LU requester (DLUR) facilities. This feature enables sessions for dependent LUs to span multiple nodes in an APPN network, instead of requiring a direct connection to the host.
DLUR on the SNAplus2 node works in conjunction with dependent LU server (DLUS) at the host. Together, they route sessions across the network from dependent LUs in the APPN network to the DLUS host. The route to the host can span multiple nodes and can take advantage of APPN's network management, dynamic resource location, and route calculation facilities.
TN Server. 3270 emulation programs that communicate over TCP/IP (rather than over an SNA network) are referred to as TN3270 programs (Telnet 3270 emulation programs).
TN3270 programs can also include support for TN3270E (Telnet 3270 standard extensions). TN3270E supports 3270 device emulation (including both terminals and printers) using Telnet. It enables a Telnet client to select a particular device (by specifying the LU name), and provides enhanced support for various functions, including the ATTN and SYSREQ keys and SNA response handling.
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