Guest

IBM Presentation Services

Introduction

Layer 6 of the SNA architectural model. This layer provides network resource management, session presentation services, and some application management.
TN3270 Server Protocol
The TN3270 Server is an application available on a Cisco Mainframe Channel Connection (CMCC) card, the Channel Interface Processor (CIP) and Channel Port Adapter (CPA). The TN3270 Server allows TN3270 clients access to IBM and IBM-compatible mainframes without the limitations of existing alternatives. It offloads 100 percent of the TCP/IP and TN3270 cycles from the mainframe, and it offers a robust, scalable, and dynamic implementation that meets the stringent requirements of the data center.

TN5250 Protocol
TN5250, Distributed Relational Database Architecture (DRDA) and Inter-System Communications (ISC) protocol are widely implemented and widely accepted standards for achieving TCP/IP-based access to mainframes and AS/400s.

3270 Data Stream Protocol
3270 devices include a series of display devices, communications controllers, and printers that connect to an IBM mainframe. They support a special type of data stream, which is called the 3270 data stream. This data stream allows applications to include control characters that instruct the receiving device how to format or display the information. The control characters allow the application to use the entire screen, as opposed to a single command line, to display information and to receive input from various areas of the screen (called partitions).

5250 Data Stream Protocol
The majority of legacy applications are written to communicate with traditional terminal devices for interactive transactions. This is accomplished through the use of data streams--strings of commands and data that instruct the terminal how to paint the screen and accept input from the user. The standard for the AS/400 is the 5250 data stream.