HP StorageWorks 2/64 HP StorageWorks Fabric OS 5.x Master Glossary (AA-RW7NA-T - Page 31

transmission word A group of four transmission characters. See also transmission character. 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 for HP StorageWorks SAN Switch 2/8-EL, 2/8V, 2/16, 2/16V, 2/32, Core Switch 2/64, and SAN Director 2/128; a set of up to eight trunked ISLs for HP StorageWorks SAN Switch 4/32 and 4/256 SAN Director. trunking ports The ports in a set of trunked ISLs. TS Time Server. An intelligent entity in a network that enables all nodes in the network to maintain a common time base. It provides the time values required to manage expiration timers. 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. An abbreviation for the communications term transmit. See also RX. UDP User Datagram Protocol. A protocol that runs on top of IP and provides port multiplexing for upper-level protocols. UL Underwriters Laboratories. An independent, not-for-profit, product-safety testing and certification organization. ULP Upper-level protocol. A protocol that runs on top of Fibre Channel. Typical upper-level protocols are SCSI, IP, HIPPI, and IPI. ULP_TOV Upper-level protocol timeout value. The minimum time that a 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 and multicast. 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. UTC Universal Time Conversion. Also called 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. A communications network that covers a wide geographic area, such as a state or a country. See also LAN and MAN. WAN_TOV Wide area network timeout value. watchdog A software daemon that monitors Fabric OS modules on the kernel. Fabric OS 5.x master glossary 31