IBM 2109 Model M12 User Manual page 87

trap (SNMP). The message sent by a simple network
management protocol (SNMP) agent to inform the
SNMP management station of a critical error. See also
simple network management protocol.
tunneling. A technique for enabling two networks to
treat a transport network as though it were a single
communication link or local area network (LAN).
Tx. Transmitted.
U. Unit of measure for rack-mounted equipment.
UART. Universal Asynchronous Receiver Transmitter.
UDP. See user datagram protocol.
ULP. See upper-level protocol.
ULP_TOV. See upper-level timeout value.
unicast. The transmission of data from a single source
to a single destination. See also broadcast and
multicast.
universal port (U_port). A switch port that can
operate as a generic port (G_port), expansion port
(E_port), fabric port (F_port), or fabric loop port
(FL_port). A port is defined as a U_port when it is not
connected or has not yet assumed a specific function in
the fabric.
U_port. See universal port.
upper-level protocol (ULP). The protocol that runs on
top of Fibre Channel. Typical upper-level protocols are
small computer system interface (SCSI), Internet
protocol (IP), HIPPI, and IPI.
upper-level timeout value (ULP_TOV). The minimum
time that a small computer system interface (SCSI)
upper-level protocol (ULP) process waits for SCSI
status before initiating ULP recovery.
user datagram protocol (UDP). A protocol that runs
on top of Internet protocol (IP) and provides port
multiplexing for upper-level protocols.
user flash. See compact flash.
VC. See virtual circuit.
VCCI. Voluntary Control Council for Interference
virtual circuit (VC). A one-way path between node
ports (N_ports) that allows fractional bandwidth.
WAN. See wide area network.
WDM. Wave division multiplexing.
well-known address. As pertaining to fibre channel, a
logical address defined by the Fibre Channel standards
as assigned to a specific function, and stored on the
switch.
wide area network (WAN). A network that provides
communication services to a geographic area larger
than that served by a local area network or a
metropolitan network, and that can use or provide public
communications facilities. (T)
workstation. A computer used to access and manage
the fabric. Can also be referred to as a management
station or host.
worldwide name (WWN). Uniquely identifies a switch
on local and global networks.
World Wide Web (WWW). A network of servers that
contain programs and files. Many of the files contain
hypertext links to other documents available through the
network.
WWN. See worldwide name.
WWW. See World Wide Web.
XLWL. See extra long wavelength.
zone. A set of devices and hosts attached to the same
fabric and configured as being in the same zone.
Devices and hosts within the same zone have access
permission to others in the zone, but are not visible to
any outside the zone. See also zoning.
zone alias. An alias for a set of port numbers or
worldwide names (WWNs). Zone aliases can be used to
simplify the entry of port numbers and WWNs. For
example, "host" could be used as an alias for a WWN of
110:00:00:60:69:00:00:8a.
zone configuration. A set of zones designated as
belonging to the same zone configuration. When a zone
configuration is in effect, all valid zones in that
configuration are also in effect.
zone member. A port, node, worldwide name (WWN),
or alias, which is part of a zone.
zone scheme. The level of zoning granularity
selected. For example, zoning can be done by switch or
port, worldwide name (WWN), arbitrated loop physical
address (AL_PA), or a mixture. See also zone
configuration.
zone set. See zone configuration.
Zoning. A feature that runs on Fabric operating
system (OS) and allows partitioning of the fabric into
logical groupings of devices. Devices in a zone can only
access and be accessed by devices in the same zone.
See also zone.
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Glossary