Service manual

Glossary
g-25
Glossary
uninterruptable power
supply
A buffer between public utility power or other power source, and a
system that requires precise, uninterrupted power.
universal port module
card
A printed circuit board (Intrepid-series directors only) that provides
four port connections that support 1.0625 or 2.125 Gbps Fibre
Channel communication. Port connectivity is provided through SFP
optical transceivers. Contrast with fibre port module card and 10 Gbps
port module card.
UPM See universal port module card.
upper level protocol A protocol that maps toand runs on top ofthe Fibre Channel through
the FC-4 layer. Examples of upper level protocols include Internet
protocol (IP) and small computer system interface (SCSI).
UPS See uninterruptable power supply.
URL See uniform resource locator.
user datagram
protocol
A connectionless protocol that runson topof IP networks. UDP offers
very few error recovery services, instead providing a direct way to
send and receive datagrams over an IP network. UDP is primarily
used for broadcasting messages over an entire network.
V
vital product data System-level data stored by FRUs in electrically erasable
programmable read-only memory. VPD identifies the manufacturer
and includes the FRU part number and serial number.
VPD See vital product data.
W
WAN See wide area network.
well-known address A set ofaddress identifiers defined in the Fibre Channel Physical and
Signaling Interface specification that access global server functions
such as a login server, management server, or name server.