Channel-to-channel adapter explained

In IBM mainframe technology, a channel-to-channel adapter (CTCA)[1] [2] [3] is a device that connects two input/output channels on (usually) two separate computer systems.[4]

The adapter allows one computer system to be treated as an input/output device by another. It is used "to link the processing units in a loosely coupled multiprocessing system.[5]

Virtual channel-to-channel adapters (VCTCA) are often used to communicate between two virtual machines in the z/VM operating system. The Virtual Machine Communication Facility (VMCF), and later Inter User Communication Vehicle (IUCV) are now often used in place of VCTCAs because they provide a simpler interface and improved performance.[6]

Notes and References

  1. IBM System/370 Special Feature Description: Channel-to-Channel Adapter . GA22.6983·Q . March 1972 . First . IBM .
  2. Book: Enterprise Systems Architecture/390 Channel-to-Channel Adapter for the System/360 and System/370 I/O Interface . SA22-7091-01 . 2nd . October 1991 . International Business Machines Corporation .
  3. Book: Enterprise Systems Architecture/390 ESCON Channel-to-Channel Adapter . SA22-7203-00 . 1st . October 1990 . International Business Machines Corporation .
  4. Book: IBM Corporation. IBM System/360 Model 65 Functional Characteristics. 1968. 10. A22-6884-3.
  5. Web site: IBM Corporation. System/370 Model 158. IBM Archives. 23 January 2003 . January 7, 2014.
  6. Jensen . R.M. . A formal approach for communication between logically isolated virtual machines . IBM Systems Journal . 1979 . 18 . 1 . 71–92 . 10.1.1.91.1907 . 10.1147/sj.181.0071 .

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