286 T10000: Interface Reference Manual August 2016
Channel
An I/O interface between a central processor and peripheral device in which large
amounts of data are transferred at the highest rate of speed possible for the
transmission medium.
Class of Service
The Fibre Channel method of defining a data transmission strategy between devices.
There are three FC Classes of Service currently specified in the FC-PH-1, and
StorageTek’s implementation includes only one, Class 3.
Class 3
The Fibre Channel Class of Service in which the initiator sends a message to a
receiving device without expecting or requiring an acknowledgement. It is analogous
to the human communication method of sending an advertisement in hopes that the
message is received.
CLS
Close.
Company ID
A unique address in IEEE proposed format.
Control Byte
The last byte of every Command Descriptor Block. The Control Byte contains two
vendor-specific bits, four reserved bits, one flag bit, and one link bit.
CRC
See Cyclic Redundancy Check.
Cyclic Redundancy Check
A mechanism used for error detection that calculates a numeric value by using a
special algorithm applied to a series of bytes that are generally appended to the data.
If no error has occurred when the receiver executes the algorithm on the received
data, the newly generated CRC value should be the same as the CRC value originally
transmitted.
D
Delimiter
In FC, a special transmission word that marks either the beginning, or ending, of a
frame in an FC transmission.
Deserialization
The process of receiving data, one bit at a time, and re-compiling it into a larger data
unit, such as a transmission character or a byte.
Destination Address
In the frame header of each frame transmitted, the destination address is a value that
identifies the port in a node that is to receive the frame.
Device Addressing
One of two levels of addressing in an I/O interface, the other being link-level. Device
addressing identifies the channel or control unit when the control unit has been
determined through link-level addressing.
Device management
Defines communications for transferring data between initiators and recipients using
FCP_CMND, FCP_XFER_RDY, FCP_DATA, and FCP_RSP information units (IUs).
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