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3270 Host Connection Program 2.1 and 1.3.3 for AIX: Guide and Reference

HCON Connections and Adapters

HCON host communication is established through several types of adapters and interfaces. Managing this connectivity involves:

HCON software communicates with a host through a 3174/3274 control unit or its equivalent, such as an integrated communications adapter in 4361 and 9370 systems. All control unit attachment protocols are supported, including:

HCON supports standalone attachments, such as a Node T2.1 connection to a mainframe host. TCP/IP connection is available when communicating to a host using an 8232 or 3172 Interconnect Controller. The Telnet 3270 protocol is supported.

This table shows HCON attachments, interfaces, and capabilities.

HCON Attachment and Interface Relationships
Attachment Type Interface DLC Host Printer
3174/3274 SNA DFT mode Coax No
3174/3274 Non-SNA DFT mode Coax Yes
Standalone SNA Node T2.1 SDLC, Token-Ring Ethernet X.25 Yes (LU1, LU3)
5088/6098 Non-SNA
Coax No
3172/8232 TCP/IP Telnet 3270 Token-Ring, Ethernet, IEEE 802.3 X.25 FDDI No
Channel TCP/IP Telnet 3270 ESCON Block Multiplexer No

With SNA connectivity and the capability to support multiple communications adapters, the limiting factor for HCON sessions is the number of expansion slots on a particular machine (usually 4 to 8). Capability is also limited by the number of cards of each type that the operating system supports.

The operating system has direct access to any customer SNA network. The choice of connectivity is dependent on the system environment and geographical location. These variables affect response time for an application:

The HCON Connectivity figure shows the connectivity capability of the HCON 3270 emulation program.


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