HP 316095-B21 - StorageWorks Edge Switch 2/24 Manual page 25

unblocked port
Devices attached to an unblocked port can log in to the director and communicate with devices
attached to any other unblocked port.
unicast
Communication between a single sender and a single receiver over a network. Compare to
multicast and anycast (communication between any sender and the nearest of a group of
receivers). See also multicast.
universal port module card
Each universal port module (UPM) card provides four Fibre Channel connections through
duplex small form factor (SFF) pluggable fiber optic transceivers. UPM cards allow 1 or 2
gigabits per second enabled.
UPM card
See universal port module
vital product data
(VPD) — System-level data stored by the backplane in the electrically erasable programmable
read-only memory. This data includes serial numbers and identifies the manufacturer.
VPD
See vital product data.
warning message
Software message that indicates a possible error was detected. See also
information message.
wrap plug
See loopback plug.
World Wide Name
(WWN) — Eight-byte address that uniquely identifies a switch, or a node (end device) on
global networks.
WWN
See World Wide Name.
zone
Set of devices that can access one another. All connected devices may be configured into one or
more zones. Devices in the same zone can see each other. Devices that occupy different zones
cannot see each other.
zone member
Specification of a device to be included in a zone. A zone member can be identified by the port
number of the director to which it is attached or by its World Wide Name. In multiswitch
fabrics, identification of end-devices/nodes by World Wide Name is preferable.
Directors and Edge Switches Glossary
card.
Glossary
error message and
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