HP StorageWorks Fabric OS 5.X Master Glossary (AA-RW7NA-TE, September 2005)

OLS Primitive sequence offline. A primitive sequence that is used during link
initializa tion between two N_Ports in a point-to-point topology or an N _Port and
an F_Port in a Fabric topology. It is sent to indicate that the transmitting port is
attempting to initialize the link, has recognized the NOS primitive sequence, or
is going offline.
OLTP Online transaction processing. Online updating of the appropriate database
recordsassoonasatransactionisentered.
ON Offline notification. A term that refers to an ELS field that appears in
portLogDump command output.
OPN Open primitive signal. Applies only to arbitrated loops; sent by an L_Port that
has won the arbitration process to op en communication with one or more ports
on the loop.
ordered set A transmission word that uses 8b/10b mapping and begins with the K28.5
chara cter. Ordered sets are used to differentiate Fibre Channel control
information from d ata frames and to manage frame transport. They occur
outside of frames and include the following items:
• Frame delimiters, which mark frame boundaries and describe frame contents
• Primitive signals, which indicate events
• Primitive sequences, which indicate or initiate port states
originator The Nx_Port that originated an exchange.
out-of-band Transmission of management protocol outside of the Fibre Channel network,
usually over Ethernet.
oversubscription A situation in which more nodes could po tentially contend for a resource than
the resource (typically an ISL) could simultaneously support. Oversubscription
could be a desirable attribute in fabric topology, as long as it does not produce
unacceptable levels of c ongestion.
OX_ID Originator ID or exchange ID. A term that refers to the exchange ID assigned
by the originator port.
packet A block of data that is transmitted over the network in a packet-switched system.
The terms packet, frame,anddatagram are often used synonymously.
See also frame.
PAL Programmable Array Logic. A relatively small FPD.
paralle
l
Atermth
at refers to the simultaneous transmission of data bits over multiple lines.
Par ticipating
Mode
A mode in which an L_Port in a lo
op has a valid AL_PA and can arbitrate, send
frames, and retransmit received transmissions.
See also L_Port and Nonparticipating Mode.
passive copper A low-cost copper Fibre Channel connection, allowing distances up to 13
meters between devices.
path selection The selection of a transmission path through the fabric. HP switches use
the
FSPF protocol.
See also FSPF.
payload The p ortion of a Fibre Cha nnel frame that contains the information being
transported by the frame. There are many different payload formats, which
are based on protocol.
PBC Por t bypass circuit. A circuit in hubs or a disk enclosure that opens or closes a
loop to add or rem ove nodes.
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Glossary