Channel-to-channel adapter

In IBM mainframe technology, a channel-to-channel adapter (CTCA) is a device which connects two channels on (usually) two separate computer systems.[1]

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.[2]

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.[3]


  1. IBM Corporation (1968). IBM System/360 Model 65 Functional Characteristics (PDF). p. 10.
  2. IBM Corporation. "System/370 Model 158". IBM Archives. Retrieved January 7, 2014.
  3. Jensen, R.M. (1979). "A formal approach for communication between logically isolated virtual machines". IBM Systems Journal. 18 (1): 71–92. Retrieved Aug 21, 2019.

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