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Public Switched Telephone Network (PSTN) This is the U.S. public telephone network. It is also called the plain old telephone service (POTS). See also central office.

punchdown tool A hand tool used to terminate twisted-pair wires on a wall jack or patch panel.

PVC See permanent virtual circuit.

QoS See Quality of Service.

quad decimal Four sets of octets separated by a decimal point; an IP address.

Quality of Service (QoS) Data prioritization at the Network layer of the OSI model. Results in guaranteed throughput rates. See also Open Systems Interconnect.

radio frequency interference (RFI) Interference on copper cabling systems caused by radio frequencies.

RAID See Redundant Array of Independent (or Inexpensive) Disks.

RAID levels The different types of RAID, such as RAID 0, RAID 1, etc.

README file A file that the manufacturer includes with software to give the installer information that came too late to make it into the software manuals. It’s usually a last-minute addition that includes tips on installing the software, possible incompatibilities, and any known installation problems that might have been found right before the product was shipped.

reduced instruction set computing (RISC) Computer architecture in which the computer executes small, general-purpose instructions very rapidly.

Redundant Array of Independent (or Inexpensive) Disks (RAID) A

configuration of multiple hard disks used to provide fault tolerance should a disk fail. Different levels of RAID exist, depending on the amount and type of fault tolerance provided.

regeneration process Process in which signals are read, amplified, and repeated on the network to reduce signal degradation, which results in longer overall possible length of the network.

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