HP 316095-B21 - StorageWorks Edge Switch 2/24 Manuel - Page 39

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HP 316095-B21 - StorageWorks Edge Switch 2/24 Manuel
Glossary
trap
Unsolicited notification of an event originating from an SNMP managed device and directed to
an SNMP network management station.
trap host
SNMP management workstation that is configured to receive traps.
trap recipient
In simple network management protocol (SNMP), a network management station that receives
messages through SNMP for specific events that occur on the arbitrated loop device.
trunk cable
Cable consisting of multiple fiber pairs that do not directly attach to an active device. This cable
usually exists between distribution panels. See also
optical cable
and
jumper
cable.
unblocked connection
In a director or switch, the absence of the blocked attribute for a specific port. See also
blocked
connection,
connectivity
attribute,
dynamic
connection, and
dynamic
connectivity.
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
card.
upper level protocol
ULP. Protocols that map to and run on top of the Fibre Channel FC-4 layer. ULPs include
Internet protocol (IP) and small computer system interface (SCSI).
user datagram protocol
UDP. A connectionless protocol that runs on top of Internet protocol (IP) networks. User
datagram protocol/Internet protocol (UDP/IP) offers very few error recovery services, instead
providing a direct way to send and receive datagrams over an IP network. UDP/IP is primarily
used for broadcasting messages over an entire network.
Directors and Edge Switches Glossary
39