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Cells in Frames (CIF) is an asynchronous transfer mode (ATM) protocol used to facilitate Ethernet data packet transfers. CIF allows ATM to be implemented using existing Ethernet equipment such as network interface cards, and provides advantages such as quality of service without additional hardware expenses.
CIF is an ATM protocol with online packets and trunks of variable lengths. The CIF Alliance specifies protocols that permit the embedding of ATM headers in frame-based legacy protocols for up to 31 virtual packet circuit cells. A key CIF feature is explicit rate flow control.
CIF uses ATM between workstations without changing legacy NIC cards, as "Shim" software is used for processing. Variable length packets create lower overhead and eliminate the need for new NICs and segmentation/reassembly hardware.
CIF's fixed cell size facilitates the following: