Glossary
Term | Main definition |
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RJ45 | A USOC code identifying an eight-pin modular plug or jack used with unshielded twisted-pair cable. Officially, an RJ-45 connector is a telephone connector designed for voice-grade circuits. Only RJ-45-type connectors with better signal handling characteristics are called eight-pin connectors in most standards documents, though most people continue to use the RJ-45 name for all eight-pin connectors. RJ-45 (Registered Jack 45) – standard for connecting UTP cabling. They are inexpensive and easy to install onto UTP cable. Used to connect devices transmitting data over local-area networks (LAN), especially Ethernets.
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RML Restricted mode launch | A launch that limits a laser
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Rope strand |
A conductor composed of groups of twisted strands.
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Router |
A device that connects two networks and allows packets
to be transmitted and received between them. A router
may also determine the best path for data packets from
source to destination. Routers primarily operate on Layer
3 (the Network layer) of the OSI model.
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Routing |
A function of the network layer that involves moving
data throughout a network. Data passes through several network segments using routers that can select the path
the data takes.
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RS232 C | In telecommunications, RS-232 is a standard for serial communication transmission of data. It formally defines the signals connecting between a DTE (data terminal equipment) such as a computer terminal, and a DCE (data circuit-terminating equipment, originally defined as data communication equipment), such as a modem, printers, mice, data storage, uninterruptible power supplies, and other peripheral devices.
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S/T interface |
The four-wire interface of an ISDN terminal adapter. The
S/T interface is a reference point in ISDN.
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Sample-and-hold circuit |
A circuit that samples an analog signal such as a voltage
level and then holds the voltage level long enough for the
analog-to-digital (A/D) converter to change the level to a
numerical value.
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SAS Single attachment station | With FDDI networks, denotes a station that attaches to only one of two rings in a dual-ring environment.
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SC connector |
An optical-fiber connector made from molded plastic
using push-pull mechanics for joining to a fiber adapter.
The SC connector has a 2.5mm ferrule push-pull latching
mechanism and can be snapped together to form
duplex and multifiber connectors. SC connectors are the
preferred fiber-optic cable for premises cabling and are
recognized by the ANSI/TIA/EIA-568-B standard for
structured cabling.
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Scanner |
A cable-testing device that uses TDR methods to detect
cable transmission anomalies and error conditions.
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Scattering |
(1) A property of glass that causes light to deflect from
the fiber and contributes to losses. (2) The redirection of
light caused by atomic structures and particles along the
light
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Schuko | Schuko plug - European mains plug (DIN49441/CEE7). Two pins with two earth points. Nickel plated. N.B. this is the plug used in Europe instead of a UK 3 pin mains plug.
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Screened Cable | See Shielded cable
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Scribe |
A tool used to mark an object prior to some type of drilling
or cutting.
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