Telephone Definitions Flashcards
Mixed signals are an _________ with digital transmissions
advantage
a structure which is mounted in the entrance facility and/or equipment room to guard against damage to the CO equipment from outside sources such as power surges or lightning is known as _________
protectors
a printed circuit board with a special connector edge that allows the board to be plugged into a slot on a back plate is called ________
card
the connection between the public switched network and customer premises equipment and or a generic term for firms that sell install and service subscriber equipment is known as
interconnected
the part of the telephone microphone which converts sound-waves of the speakers into electrical energy is known as the
transmitter
a unit of information in binary which represents one of two states of information, either a 1 or 0, as apposed to a decimal figure is referred to as a__________
bit
a switch located within a telephone set alerts the switching equipment that a caller has initiated a call or that the caller has finished and the parties have disconnected. it operates when the user removes the handset from the telephone (off-hook) or returns the handset to the telephone (on-hook) is known as________
hookswitch
a location identifier enabling messages to be sent and received to a particular person or station is know as
address
a unit used for temporary storage of data; a storage element which may be written into or read out from any memory address, or at any point in time is known as ________
RAM random access memory
the term for a time period enclosing a character a character group or bit group involved in a digital carrier system is a ____________
frame
the point of access into a communications system, computer, network or other electronic device is known as ________
port
in data communications a bit added to a group of bits so that the number of 1s in the group is always odd or even. used on a byte by byte basis to verify the integrity of data transmission. the receiving end of the transmission must be prepared for the same type of _______ (odd/even) that is being sent
parity
a type of transmission facility that uses radio frequencies between 1,000 and 20,000 megahertz extensively used for TV transmission and by some long distance carriers is known as_______
microwave
a trunk connecting a subscribers telephone equipment to a central office other than the local central office is________
Foreign exchange trunk
name three types of protectors
fuse, airgaps, rare gas
what is the factor by which LEC’s determine responsibility for repair and maintenance
demarcation point
what does COS stand for
class of service
refers to the capability of fully charged battery cells to carry the power load of a system when commercial power fails and the primary power source is inoperative is known as_________
battery backup
a series of digits or characters that must be entered into a system such as a telephone or other communication terminal to gain access is know as __________
access code
an application of ISDN which, by combining two or more B channels allows improved motion for video is known as _______
video conferencing
subscribers to ________ that are behind the same system can all call each other as if they were extensions allowing for the transferring of calls
centrex services
the number of cycles completed per unit of time measured in Hertz is ________
frequency
an independent federal agency responsible for regulating interstate and foreign telecommunications is known as _________
FCC
what does DTMF stand for
Dual tone multi frequency
a data communications transmission rate based on the number of signal level changes per second, regardless of the information content of those signals is known as________
baud rate
a special program built into a system to control the hardware and software resources and to supervise the running of other programs is known as________
operating system
a ________ is usually 8-bits and represents a single character.
byte
a storage device within a computer system that compensates for a difference in the rate of data flow when transmitting data from one device to another is know as _____________
buffer
a method of organizing speech samples into a single communication path by interleaving them into time slots is known as
time division multiplexing.
A key system that replaces electromechanical relay controls with electronic devices; four or six conductors per telephone replace bulky multiple cables is known as__________
EKTS electronic key telephone set
cabinet which contains the control modules associated with the key telephone systems; usually electromechanical relay units or electrical printed circuit cards
Key service unit (KSU)
to momentarily depress and release a telephone hook-switch in order to signal a request for a feature such as a conference or transfer is known as _______
hook flash
what is a type of signaling in telephone switching systems that uses direct current in a ground return path to indicate a subscriber’s request for service
ground start
this provides centralized telecommunications services to tenants in a building or complex. Also exists in large shopping centers and high rises
Shared tenant services
a junction box on the side of a house where tip and ring connect to the outside network is known as_______
NID
the difference in hertz between the highest and lowest frequency of a group or band of frequencies is known as _________
bandwidth
an individual person or company who has a telephone number in their name is known as a
subscriber
a device that combines two or more signals for transmission over the same path is known as _______
Multiplexer unit MUX
carriers who provide telephone service within their franchise area are known as LECs what does this stand for__________
local exchange carriers
the part of the telephone which converts electrical energy back to voice is known as the
receiver
a method of signaling where the amplitude or frequency of the electrical signal is analogous to the source, is known as ___________
analog transmission
a wiring board used in microcomputers and mini computers to provide connections between logic, memory, and input/output modules is known as________
backplate
a guideline platform for upgrading global telephone communications to a completely digital switched network , simultaneous transmission of voice and data over multiplexed communications circuits is _________
integrated services digital network (ISDN)
one of the local telephone exchange areas which serve to distinguish local phone service from long distance service is____________
Local access and transport area
