Glossary

unblocked port

Devices attached to an unblocked port can login to the director and communicate with devices attached to any other unblocked port assuming that this is supported by the current zoning configuration.

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).

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 Gb/s and 2 Gb/s operation.

vital product data

System-level data stored by the backplane in the electrically erasable programmable read-only memory. This data includes serial numbers and identifies the manufacturer.

UPM card

See universal port module card.

VPD

See vital product data.

warning message

Indication that a possible error has been detected. See also error message and information message.

wrap plug

See loopback plug.

World Wide Name

Eight byte address that uniquely identifies a switch, or a node (end device), even 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. Those devices that occupy different zones cannot.