HP 316095-B21 FW 08.01.00 McDATA EFCM Basic User Manual (620-000240-000, Novem - Page 300

Glossary UL unblocked connection unblocked port Underwriters Laboratories uniform resource locator uninterruptable power supply universal port module UNIX UPM UPS URL user datagram protocol See Underwriters Laboratories. In a director or switch, the absence of the blocked attribute for a specific port. Contrast with blocked connection. See connectivity attribute. See also dynamic connection; dynamic connectivity. Devices communicating with an unblocked port can log into the director or switch and communicate with devices attached to any other unblocked port (assuming that this is supported by the current zoning configuration). UL. A laboratory organization accredited by the Occupational Safety and Health Administration and authorized to certify products for use in the home and workplace (D). URL. A URL is the address of a document or other resource on the Internet. UPS. A buffer between public utility power or another power source, and a system that requires precise, uninterrupted power (D). UPM. A flexible 1 gigabit-per-second or 2 gigabit-per-second module that contains four generic ports (G_Ports). A popular multi-user, multitasking operating system originally designed to be a small, flexible system used exclusively by programmers. UNIX was one of the first operating systems to be written in a high-level programming language, namely C. This meant that it could be installed on virtually any computer for which a C compiler existed. Due to its portability, flexibility, and power, UNIX has become the leading operating system for workstations. Historically, it has been less popular in the personal computer market, but the emergence of a new version called Linux is revitalizing UNIX across all platforms. See universal port module. See uninterruptable power supply. See uniform resource locator. 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 g-42 EFCM Basic User Manual