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DC Power > A > Flashcards

A Flashcards

1
Q

AC

A

Alternating current. Typically refers to the 120-volt electricity delivered by local power utility to an outlet in a wall. The current alternates between plus and minus, 60 times per second.

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2
Q

Access Level

A

The level of programs and data to which a given terminal and/or operator are granted access.

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3
Q

AC/DC Ringing

A

A common way of signaling a telephone. An alternating current (AC) rings the phone bell and a direct current (DC) is used to work a relay to shut the ringing off when the called person answers.

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4
Q

AC Distribution Cabinet

A

A cabinet housing fuses and/or circuit breakers that distribute commercial or reserve AC power to equipment in a telephone building. May be floor or wall mounted.

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5
Q

ACO (Alarm Cut-Off)

A

A switch used to silence an audible alarm while maintaining the visual signal.

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6
Q

AC Standby Power (Reserve Power)

A

Power delivered by an engine alternator set (generator) or UPS during interruption of commercial power.

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7
Q

Affected Employee

A

An employee whose job requires him/her to operate or use a machine or equipment on which servicing or maintenance is being performed under lockout or tagout, or whose job requires him/her to work in an area in which such servicing or maintenance is being performed.

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8
Q

Alarm

A

Flashing light, ringing bell or other visual or audible signal indicating equipment malfunction.

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9
Q

Alarm or Indicator Fuse

A

Type of fuse used on distribution and equipment frames used in parallel with larger load fuses to indicate the operation of the load fuse.

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10
Q

Alarm Center

A

A location generally within a technical control facility that receives local ad remote alarms.

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11
Q

Alarm Condtion

A

Term used to describe equipment in a failed state.

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12
Q

Alarm Display

A

Attendant console indicators that show the status of a telephone system. There are usually two types of displays, minor and major. Minor displays are not usually service affecting, while major is, and requires immediate attention.

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13
Q

Alarm Pair

A

A cable pair used to carry alarm circuits. For example, circuits from remote pressure contactors to centrally located alarm equipment is a cable pressurization system.

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14
Q

Alarm Relay

A

A relay that operates a circuit signaling an alarm.

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15
Q

Alarm Terminal Strip

A

An area on a Power Board provided for connection of external alarm leads to the power board,

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16
Q

Algorithm

A

A prescribed finite set of well-defined rules or processes for the solution of a problem in a finite number of steps. Basically, an algorithm is the mathematical formula for an operation, such as computing the check digits on packets of data that travel via packet switched networks. In T-1, an “algorithm” is a “recipe” for making a computer do something. A sequence of steps followed by a computer to complete a task.

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17
Q

Alphanumeric

A

A message or other type of readout containing both letters (“alphas”) and numbers (“numerics”).

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18
Q

Alternating Current Generator

A

An alternator; a rotating machine that produces an alternating current output.

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19
Q

Alternator

A

A generator that produces electric power in the form of alternating current and voltage.

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20
Q

Ambient

A

Surrounding; often used as shorthand for surrounding air.

21
Q

Ambient Noise Level

A

The level of acoustic noise existing in a room or other location, as measured with a sound level meter. It is usually measured in decibels above a reference level of 0.00002 netwon per square meter in SI units or 0.00002 dyne per square centimeter in cgs units.

22
Q

Ambient Temperature

A

Temperature of a surrounding fluid, air or gas.

23
Q

Ammeter

A

Instrument that measures the amount of current in amperes flowing in a circuit.

24
Q

Amp

A

Abbreviated form of ampere.

25
Q

Ampacity

A

Current carrying capacity, expressed in amperes, of a wire or cable under stated thermal conditions.

26
Q

Amperage

A

The strength of an electric current in amperes.

27
Q

Amperage Rating

A

The amperage that may be safely applied to a circuit, service or equipment.

28
Q

Ampere

A

A measure of electrical current in amperes.

29
Q

Ampere-Hour

A

When the current is one ampere, the quantity of electricity that flows in an hour. Multiplying current in amperes by time of flow in hours equals ampere-hours. In this case, batteries are often rated over an eight-hour period.

30
Q

Analog

A

The traditional method of modulating radio signals so that they carry information. AM (amplitude modulation) and FM (frequency modulation) are the two most common methods of analog modulation.

31
Q

Analog Channel

A

A channel that transmits in analog waveforms.

32
Q

Analog Device

A

A simple computer-type device able to operate on analog inputs and produce analog outputs.

33
Q

Analog/Digital Converter

A

A device that converts an analog signal to a digital signal.

34
Q

Analog Signal

A

An electrical signal that varies continuously over an infinite range of voltage or current values, as opposed to a digital signal, which varies discretely between two values, usually one and zero. It is easiest to think of analog signals as sine waves of various sizes.

35
Q

Analog Value

A

A continuously variable parameter.

36
Q

Annunciator Panel

A

Name given to the visual and audible portion of the alarm interface/isolation facility that utilizes visual/audible panels throughout the telephone office.

37
Q

ANSI (American National Standards Institute)

A

A standards-setting, non-government organization that develops and publishes standards for “voluntary”use in the United States.

38
Q

Antimony Battery

A

Storage cell that utilizes lead-antimony allow plates.

39
Q

Apparatus Blank

A

A blank panel used to cover open equipment space in a rack or shelf.

40
Q

Arcing

A

Sustained luminous passage of current between contacts or electrodes.

41
Q

Arrestor

A

A device used to protect equipment from lightening, electrical storms, etc.

42
Q

ASCII (American Standard Code for Information Exchange)

A

The standard 7-bit code for transferring information on local and long distance telecommunications lines. The ASCII code enables representation of 128 separate numbers, letters and control characters. By using an eight bit, as in IBM’s EBCDIC, you can represent 256 different characters. ASCII often uses an eighth bit, but is used as a parity check or a way of encoding word processing symbols, not as a way of broadening the number of characters and symbols which it can represent.

43
Q

Audible/Visual Panel

A

An alarm panel usually equipped with audible, visual and alarm cut-off features.

44
Q

Authorized Employee

A

A person who locks out or tags out machines or equipment in order to perform servicing or maintenance on that machine or equipment.

45
Q

Automatic Equalization

A

The process of compensating for distortion of data communications signals over an analog circuit. With regard to battery systems, an automatic equalization means to raise the battery voltage slightly to equalize the voltage on all the battery cells.

46
Q

Automatic Power Transfer

A

Automatic transfer of a load from one power source to another, or to a standby source.

47
Q

Autotransformer

A

Transformer in which both the primary and secondary currents flow through one common part of the coil.

48
Q

Auxiliary power

A

An alternate source of electric power, serving as back-up for the primary power at the station main bus or prescribed sub-bus.

49
Q

AWG (American Wire Gauge)

A

Measurement scale for non-ferrous (copper, bronze, etc.) wire.

DC Power (2 decks)

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