Channel-to-channel adapter
| Industry | Computer hardware |
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In the realm of IBM mainframe systems, a channel-to-channel adapter (CTCA) serves as a hardware component that links two input/output channels, typically located on distinct computer systems.
This device allows one system to function as an input/output peripheral for another, effectively interconnecting processing units within a loosely coupled multiprocessing framework.
Within the z/VM operating environment, virtual channel-to-channel adapters (VCTCA) enable communication between virtual machines. Despite this, the Virtual Machine Communication Facility (VMCF) and its successor, the Inter User Communication Vehicle (IUCV), are frequently preferred over VCTCAs because they offer more straightforward interfaces and enhanced efficiency.
For IBM Z processors, CTCA capabilities are realized by linking pairs of ESCON or FICON channels either directly point-to-point or through a director device.