TCPaccess is a software product which implements the

TCP/IP The Internet protocol suite, commonly known as TCP/IP, is a framework for organizing the communication protocols used in the Internet and similar computer networks according to functional criteria. The foundational protocols in the suite are ...

protocol suite on

IBM International Business Machines Corporation (using the trademark IBM), nicknamed Big Blue, is an American Multinational corporation, multinational technology company headquartered in Armonk, New York, and present in over 175 countries. It is ...

mainframe A mainframe computer, informally called a mainframe or big iron, is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterpris ...

computers using the

MVS Multiple Virtual Storage, more commonly called MVS, is the most commonly used operating system on the System/370, System/390 and IBM Z IBM mainframe computers. IBM developed MVS, along with OS/VS1 and SVS, as a successor to OS/360. It is unr ...

operating system. It was developed in 1986 by Advanced Computer Communications under the name ''ACCES/MVS'', and was the first commercial TCP/IP implementation for MVS mainframes. It is usually associated with

Interlink Computer Sciences Interlink Computer Sciences, Inc., of Fremont, California, was a developer of hardware and software that allowed IBM mainframe computers running the MVS operating system to be connected to non-IBM networks. Interlink was founded in 1983 by Lamber ...

, which developed and marketed the product from 1990 until 1999, and is frequently referred to as "the Interlink stack". The product was marketed by

Cisco Systems Cisco Systems, Inc. (using the trademark Cisco) is an American multinational corporation, multinational digital communications technology conglomerate (company), conglomerate corporation headquartered in San Jose, California. Cisco develops, m ...

as ''

Cisco IOS The Internetworking Operating System (IOS) is a family of proprietary network operating systems used on several router and network switch models manufactured by Cisco Systems Cisco Systems, Inc. (using the trademark Cisco) is an American ...

for

S/390 The IBM System/390 is a discontinued mainframe product family implementing ESA/390, the fifth generation of the System/360 instruction set architecture. The first computers to use the ESA/390 were the Enterprise System/9000 (ES/9000) fa ...

''. It is currently offered by

Computer Associates CA Technologies, Inc., formerly Computer Associates International, Inc., and CA, Inc., was an American multinational enterprise software developer and publisher that existed from 1976 to 2018. CA grew to rank as one of the largest independent ...

as ''Unicenter TCPaccess Communications Server''.

External links

''Cisco IOS for S/390''
– From Cisco Systems. {{network-software-stub Internet Protocol based network software IBM mainframe software