Chaparral G5312, Руководство пользователя

Страница: 145 / 160

G-1
Glossary
Address— An address is a data structure or logical convention used to identify a
unique entity, such as a particular process or network device.
Arbitrated loop physical address (AL_PA)— An AL_PA is a 1-byte value used
in an arbitrated loop topology. This value is used to identify L_Ports. The value then
becomes the last byte of the address identifier for each public L_Port on the loop.
Bus— See Channel.
Channel— A channel is a common physical path composed of wires or other media,
across which signals are sent from one part of a computer to another. A channel is a
means of transferring data between modules and adapters, or between an adapter and
SCSI devices. A channel topology network consists of a single cable trunk that
connects one workstation to the next in a daisy-chain configuration. All nodes share
the same medium, and only one node can broadcast messages at a time.
Fabric— Fabric refers to a switched topology, which is one of the three FC
topologies. Fabric elements, which are responsible for frame routing, interconnect
various N_Ports or NL_Ports. Depending on vendor support, fabric switches may be
interconnected to support up to 16 million N_Ports on a single network.
Fibre— Fibre is a generic FC term that refers to all transmission media types
specified in the FC Physical Layer standard (FC-PH), such as optical fiber, copper
twisted pair, and copper coaxial cable.
Fibre channel (FC)—
FC is a bidirectional, point-to-point serial data channel,
structured for high-performance capability. In the physical sense, an FC is an
interconnection of multiple communication points, called N_Ports, by a switching
network (fabric). FC transports incoming data from devices by reading the buffer
information, packaging it, and sending the information across the fabric. Although FC
is a generalized transport mechanism that has no protocol of its own or native I/O
command set, it can transport any existing upper level protocol such as SCSI and IP.
FC offers high-speed data transfer rates up to 1 Gbps. FC is most commonly used to
connect clustered servers to storage systems. ANSI has developed standards for FC.
FC adapter— An FC adapter is a printed circuit assembly that translates data
between the FC host processor’s internal bus and FC link.