IBM 2109 Model M12 User Manual page 84

phantom device. A device that is not physically in an
arbitrated loop, but is logically included through the use
of a phantom address.
PLDA. See private loop direct attach.
PLOGI. See port login.
PMC. PCI mezzanine card.
P/N. Part number.
point-to-point. A Fibre Channel topology that employs
direct links between each pair of communicating
entities.
port cage. The metal casing extending out of the
optical port on the switch, and in which the gigabit
interface converter (GBIC) or small form-factor
pluggable (SFP) can be inserted.
port card. A Fibre Channel card that contains optical
or copper port interfaces, and acts like a switch module.
See also 16-port card.
port login (PLOGI). The port-to-port login process by
which initiators establish sessions with targets. See also
fabric login.
port module. A collection of ports in a switch.
port_name. The unique identifier assigned to a Fibre
Channel port. Communicated during login and port
discovery.
POST. See power-on self-test.
power-on self-test (POST). A series of diagnostics
that are automatically run by a device when the power
is turned on.
primary FCS switch. Primary fabric configuration
server switch. The switch that actively manages the
configuration and security parameters for all switches in
the fabric. See also backup FCS switch and FCS
switch.
primitive sequence. A part of an ordered set that
indicates or initiates port states. See also ordered set.
primitive signal. A part of an ordered set that
indicates events. See also ordered set.
principal switch. The switch that assumes the
responsibility to assign domain IDs. The role of principal
switch is negotiated after a "build fabric" event.
private device. A device that supports arbitrated loop
protocol and can interpret 8-bit addresses, but cannot
log into the fabric.
private loop. An arbitrated loop that does not include
a participating fabric loop port (FL_port).
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IBM TotalStorage SAN Switch: 2109 Model M12 User's Guide
private loop direct attach (PLDA). A subset of fibre
channel standards for the operation of peripheral
devices.
private NL_port. A node loop port (NL_port) that
communicates only with other private NL_ports in the
same loop and does not log into the fabric.
protocol. A defined method and a set of standards for
communication.
public device. A device that supports arbitrated loop
protocol, can interpret 8-bit addresses, and can log into
the fabric.
public loop. An arbitrated loop that includes a
participating fabric loop port (FL_port), and can contain
both public and private node loop ports (NL_ports).
public NL_port. A node loop port (NL_port) that logs
into the fabric, can function within either a public or
private loop, and can communicate with either private or
public NL_ports.
quad. A group of four adjacent ports that share a
common pool of frame buffers.
QuickLoop. (1) A feature that makes it possible to
allow private devices within loops to communicate with
public and private devices across the fabric through the
creation of a larger loop. (2) The arbitrated loop created
using this software. A QuickLoop can contain a number
of devices or looplets; all devices in the same
QuickLoop share a single arbitrated loop physical
address (AL_PA) space.
QuickLoop mode. A hardware translative mode that
allows private devices to communicate with other private
devices across the fabric. See also hardware translative
mode and standard translative mode.
RAID. See redundant array of independent disks.
RAM. See random access memory.
RAN. Remote Asynchronous Notification.
random access memory (RAM). A temporary storage
location in which the central processing unit (CPU)
stores and executes its processes.
R_A_TOV. See resource allocation timeout value.
read only memory (ROM). Memory in which stored
data cannot be changed by the user except under
special conditions.
receiver ready (R_RDY). A primitive signal indicating
that the port is ready to receive a frame.
reduced instruction set computer (RISC). A
computer that uses a small, simplified set of frequently
used instructions for rapid processing.