Glossary
- °
- Angular Measure; Degree
- °C
- Degree Celsius/Centigrade
- °F
- Degree Fahrenheit
- 100BaseT
- A synonym for the Fast Ethernet network standard. The '100' refers to a maximum data-transfer rate of 100 megabits per second over twisted pair, copper wire.
- 10BaseT
- A synonym for the Fast Ethernet network standard. The '10' refers to a maximum data-transfer rate of 10 megabits per second over twisted pair, copper wire.
- 10K
- A grade level Box or Cover rating. See 'Incidental Light Traffic'.
- 1A
- 1 Normally Open
- 1B
- 1 Normally Closed
- 20A
- A California ruling that has the investor owned utilities performing the under-grounding of electrical cables. The funds to perform the work are derived from rates and go into a sinking fund that is used at the discretion of the municipality the electric
- 20B
- A California ruling that has the investor owned utilities performing the under-grounding of electric cables. The funds to perform this work are derived from a combination of rates and the developer of the land the line is on. This work is done at the di
- 20C
- A California ruling that has the investor owned utilities performing the under-grounding of overhead electrical cables. The funds to perform this work are derived from the developer of the land the line is on.
- 20K
- A grade level Box or Cover rating. See 'Occasional Traffic'.
- 2S1W
- Two Speed, 1 Winding (motor).
- 2S2W
- Two Speed, 2 Winding (motor).
- 3 Phase
- See 'Three Phase' and 'Polyphase'
- 555 Timer
- Introduced by Signetics in 1971, the 555 timer is still one of the most popular ICs. It is used in timer and multivibrator applications.
- 600 Volt
- Electrical systems, cables or service designed to be operated under 1000 Volts.
- 600V-UD
- 600 Volt Underground Distribution Cable.
- 802.11a
- A specification for a wireless LAN that operates in the 5GHz frequency range and provides a data transmission rate of 54Mbps using spread spectrum technology.
- 802.11b
- A specification for a wireless LAN that operates in the 2.4GHz range and provides a data transmission rate of 11Mbps using spread spectrum technology. This specification was known as Wi-Fi but the term now applies to 802a and 802g as well.
- 802.11g
- A specification for a wireless LAN that operates in the 2.4GHz frequency range and provides a data transmission rate, over short distances, of 54Mbps using orthogonal frequency division multiplexing (OFDM) technology.
- 802.1x
- A security standard for wired and wireless LANs.
- 802.3 Network
- A 10 Mb/s CSMA/CD bus-based network; commonly called Ethernet.
- 802.5 Network
- A token-passing ring network operating at 4 Mb/s or 16 Mb/s.
- 8B10B Encoding
- A signal modulation scheme in which eight bits are encoded in a 10-bit word to ensure that too many consecutive zeroes doe not occur; used in ESCON and fibre channel.
- A
- 1) Amperes
- A-H
- Ampere-Hour
- A/D Conversion
- The process of converting an analogue signal into an equivalent digital one utilizing an A/D converter.
- A/D or ADC
- Abbreviation for analog-to-digital converter.A device used to convert analog signals to digital signals.
- AA
- 1) The Aluminum Association. 2) Refers to All Aluminum as in All Aluminum Conductor.
- AAAC
- All Aluminum Alloy Conductor
- AAC
- All Aluminum Conductor.
- AAC/TW
- All Aluminum Conductor, Trapezoidal-Shaped Aluminum Strands.
- AAGR
- Average Annual Growth Rate
- AASHTO
- American Association of Safety Highway Traffic Officials
- ABS
- Acrylonitrile-Butadiene-Styrene (Plastic)
- Absorbed Glass Mat
- Absorbed Glass Mat, also known as AGM, is a newer type of battery construction that uses saturated absorbent glass mats rather than gelled or liquid electrolyte. It is somewhat more expensive than flooded (liquid) type, but offers good reliability and fa
- Absorption
- That portion of optical attenuation in optical fiber resulting from the conversion of optical power to heat.Caused by impurities in the fiber such as hydroxyl ions.
- AC
- Abbreviation for alternating current.An electric current that reverses its direction at regularly recurring intervals.
- ACAR
- All Aluminum Conductor, Aluminum Alloy Reinforced.
- ACB
- Air Circuit Breaker
- Acceptable Quality Level
- Acceptance Angle
- The half-angle of the cone within which incident light is totally internally reflected by the fiber core. It is equal to sin-1 (NA).
- Access Point
- A wireless networked device usually connected to a wireless LAN used to access the wired LAN.
- Accuracy
- The degree of uncertainty for which a measured value agrees the ideal value.
- Accuracy Class
- A number used to indicate the accuracy range of a measurement transducer, according to the defined standard.
- ACSR
- Aluminum Conductor Steel Reinforced.
- ACSR/AW
- Aluminum Conductor, Aluminum Clad Steel Reinforced.
- ACSR/TW
- ACSR conductor made using Trapezoidal Wire construction.
- ACSS
- Aluminum Conductor Steel Supported. This is a conductor that is generally used for overhead transmission construction. ACSS is often preferred over ACSR because of its superior sag characteristics.
