Channel-to-channel adapter

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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 are often used to communicate between two virtual machines in the z/VM operating system.


  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.