HP StorageWorks Fabric OS 5.0.0 Command Reference Guide (AA-RW1MA-TE, May 2005)

Fabric OS 5.0.0 command reference guide 781
TPC Third-party copy. A protocol for performing tape backups without using server resources.
track changes A 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
character
A 10-bit character encoded according to the rules of the 8b/10b algorithm.
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.