Definition 1 of 21
connect in-house telephones together within a private network and manage the telephones'
access to the Public Switched Telephone Network (PSTN).
Public switched telephone network (pstn)
Voice-data-video (vdv) Systems include:
Private Branch Exchanges (PBXs)
Pan-tilt-zoom (ptz) cameras
Definition 2 of 21
use special jacks that open the connection between the premises wiring and the telephone
line, inserting a dialer into the circuit.
Telephone Line Seizure Modules
Telephone Handset
Telephone Line Seizure Devices
Camera Lenses
Definition 3 of 21
record digital video information on storage media that is accessible via the local network.
Public Switched Telephone Network (pstn)
Multi-image Monitor
Telephone Handset
Network DVRs
,Definition 4 of 21
changing the position of a telephone hook switch changes the operation of a telephone.
Telephone Hook Switch
Field-of-view
Telephone Line Seizure Devices
Telephone Handset
Definition 5 of 21
the focal length of a camera lens determines how much area is covered by the camera.
Focal Zone
Focal Length
Near Field
Camera Lenses
Definition 6 of 21
A network of telephone exchanges that can be connected together to make a continuous
circuit for each telephone call.
Internet service provider (isp)
Public Switched Telephone Network (PSTN)
Integrated Services Digital Network (isdn)
Both of the above usually have equal availability.
, Definition 7 of 21
if the transmitted electrical signals from a telephone are greater than one bit in length, then the
bit rate is greater than a corresponding baud rate.
Bit Rates and Baud Rates
Camera Lenses
Field-of-view
Dtmf Tones
Definition 8 of 21
focus light reflected from an object within its field-of-view on an image sensor, which converts
the light information into electrical signals.
Image Sensors
Camera Lenses
Camera Angles Or Shot Angles
Electrostatic Focusing Lenses
Definition 9 of 21
each telephone keypad digit responds to a pair of DTMF tones.
Camera lenses
Telephone handset
Bit rates and baud rates
DTMF tones
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