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Glossary > U (4 entries)

  • UL Underwriters Laboratories
    A privately owned company that test to make sure that products meet safety standards. UL also administers a program for the certification of Category-Rated Cable.
  • Universal Slot
    Slots in a telephone cabinet that are used for a variety of optional PCBs.
  • UPS Uninterruptible Power Supply
    A power supply that includes a battery to maintain power in the event of a power outage, especially important in data center applications.
  • UTP Unshielded Twisted Pair
    Cable containing one or more pairs of twisted copper without metallic shielding.