Sun Oracle Storage Tek T10000, Reference Manual

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Glossary
262 T10000: Interface Reference Manual • January 2011 • E20425-01
HSSDC High speed serial data connectors.
StorageTek tape drives use this type of
connector at the interface card.
Hub A piece of hardware, separate from the
actual FC interface accessible on the backplane
of a device, which houses the port bypass
circuitry for configurations of 8 to 16 ports per
hub. Hubs may be stacked to support larger
configurations, and can usually support a mix of
both electrical and optical media ports in the
same hub.
I
Idle A special type of fill word sent from a
transmitting port to a receiving port that contains
no data or control information, but communicates
that the transmitting port has more frames to
send. The idle word is necessary because FC
needs a continuous flow of transmissions and
receptions to remain operational.
ILI Illegal length indicator.
Inbound Fiber The fiber in a link that carries
information into a receiving port.
Information Unit A unit of information defined
by FC-4 mapping transferred as sequences.
Intelligent Peripheral Interface The NCITS
standard used in host computers to control
peripheral devices at a speed of up to 100 MB/s.
In its FC implementation, IPI remains half-duplex
within I/O operations.
Internet Protocol A stacked set of protocols,
developed by the U.S. Department of Defense,
to facilitate communication between dissimilar
computers over networks.
Invokable A function of Fibre Channel that
allows a feature to be used between an initiator
and a recipient (such as cartridge subsystem).
Thus, if a feature or parameter is invoked, the
recipient must implement and respond to the
feature or parameter.
IP See Internet Protocol.
IPI See Intelligent Peripheral Interface.
ips Inches per second, a tape movement
measurement.
IU See information unit.
J
Jitter The deviation of timing in an exchange.
L
L_Port It is either an FL_Port or an NL_Port.
Laser A term meaning Light Amplification by
Stimulated Emission of Radiation. Laser devices
generate coherent radiation in the visible,
ultraviolet, and infrared portions of the
electromagnetic spectrum. Regarding FC, lasers
can be transmitting either short waves or long
waves, depending on the composition of the
arbitrated loop or fabric.
LC connector A standard connector for 2 Gbps
Fibre Channel data transfer. This type of
connector is used on fiber-optic cables.
LIFO Last in first out.
Link A two-fiber connection made between two
FC ports in which one fiber is transmitting, the
other receiving, information.
Link Bit The link bit allows the initiator to “link”
or continue the input/output process. This bit
allows devices that support command linking to
indicate to the initiator that the command was
accepted by returning a status of “Intermediate”
to the initiator.
Link Service The set of commands used by FC
to manage functions such as port management,
login/logout, and abort operations. There are
both basic and extended link services, which
StorageTek cartridge tape subsystems support.
Link Services Command Reject The code
returned by a recipient device (such as a
cartridge subsystem) receiving a request for
Extended Link Services which are unsupported.
The recipient returns a reason code of
“Command not supported.”
Linking (1) The activity of connecting one
inbound fiber and one outbound fiber to a port.
(2) The activity of linking commands, as
identified in the INquiry data, where the flag bit of
the Command Descriptor Block is set to zero.