embedded web server user guide

Glossary–38 embedded web server user guide
Glossary
trap recipient
In simple network management protocol (SNMP), a network management station that receives
messages through SNMP for specific events that occur on the arbitrated loop device.
UDP
See user datagram protocol.
UL
See Underwriters Laboratories.
unblocked connection
In a Director or Switch, the absence of the blocked attribute for a specific port. Contrast with
blocked connection. See also connectivity attribute; dynamic connection; dynamic
connectivity.
unblocked port
Devices communicating with an unblocked port can login to the Director or Switch and
communicate with devices attached to any other unblocked port (assuming that this is
supported by the current zoning configuration).
Underwriters Laboratories
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).
uniform resource locator
URL. A URL is the address of a document or other resource on the Internet.
uninterruptable power supply
UPS. A buffer between public utility power or another power source, and a system that
requires precise, uninterrupted power (D).
universal port module
UPM. A flexible 1 gigabit-per-second or 2 gigabit-per-second module that contains four
generic ports (G_Ports).
UNIX
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.
UPM
See universal port module.