HP StorageWorks 2/64 - Core Switch Command Reference Manual page 819

TPC Third-party copy. A protocol for performing tape backups without using server resources.
track changes An HP Fabric OS feature that can be enabled to report specific activities (for example, logins,
logouts, and configuration task changes). The output from the track-changes feature is dumped
to the error log for the switch.
transceiver A device that converts one form of signaling to another for transmission and reception; in fiber
optics, optical to electrical.
translate domain See xlate domain.
Translative Mode A mode in which private devices can communicate with public devices across the fabric.
transmission A 10-bit character encoded according to the rules of the 8b/10b algorithm.
character
transmission word A group of four transmission characters.
trap (SNMP) The message sent by an SNMP agent to inform the SNMP management station of a critical
error. See also SNMP.
trunking In Fibre Channel technology, a feature that enables distribution of traffic over the combined
bandwidth of up to four ISLs between adjacent switches, while preserving in-order delivery.
trunking group A set of up to four trunked ISLs.
trunking ports The ports in a set of trunked ISLs.
TS Time Server.
TTL Time-to-live. The number of seconds an entry exists in cache before it expires.
tunneling A technique for enabling two networks to communicate when the source and destination hosts
are both on the same type of network but are connected by a different type of network.
TX Transmit.
U_Port Universal port. A switch port that can operate as a G_Port, E_Port, F_Port, or 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.
UDP User Datagram Protocol. A protocol that runs on top of IP and provides port multiplexing for
upper-level protocols.
ULP Upper-level protocol. The protocol that runs on top of Fibre Channel. Typical upper-level
protocols are SCSI, IP, HIPPI, and IPI.
ULP_TOV Upper-level timeout value. The minimum time that an SCSI ULP process waits for SCSI status
before initiating ULP recovery.
unicast The transmission of data from a single source to a single destination. See also broadcast,
multicast.
UTC Universal Time Conversion. Also known as Coordinated Universal Time, which is an
international standard of time. UTC is 8 hours behind Pacific Standard Time and 5 hours
behind Eastern Standard Time. See also GMT.
WAN Wide area network.
WAN_TOV Wide area network timeout value.
watchdog A software daemon that monitors Fabric OS modules on the kernel.
Fabric OS 5.x command reference guide 819