Technical data

Glossary-18 Fabric OS Administrator’s Guide
Publication Number: 53-0000518-09
Switched fabric. Multiple N_Ports linked to a switch by F_Ports.
Arbitrated loop. Multiple NL_Ports connected in a loop.
track changes A Brocade 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
system message 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.
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
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. [How is
this different from a G_Port?]
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”.