Exam (elaborations)
VDV Chapter 1
Exam of 2 pages for the course VBSC at VBSC (VDV Chapter 1)
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VDV Chapter 1Analog Signal - ANS-A method of signaling that uses properties of the transmission
medium to covey sound characteristics, such as using electrical properties to covey the
characteristics of voice.
Loop Start Signaling - ANS-A method of signaling that relies on connecting the tip and
ring wires connecting to a device to complete an electrical circuit; typically used in
devices connecting to the PSTN.
Ground Start Signaling - ANS-A method of signaling that relies on grounding wires
connecting to a device to signal a new call; typically used in PBX systems to avoid
glare.
Glare - ANS-An instance in which a user picks up a phone and connects unexpectedly
to an incoming call.
Time-Division Multiplexing (TDM) - ANS-A method of transmitting multiple channels of
voice or data over a single digital connection by sending data in specific time slots.
Channel Associated Signaling (CAS) - ANS-A method of digital signaling in which
signaling information is transmitted using the same bandwidth as the voice.
Common Channel Signaling (CCS) - ANS-A method of signaling in which information is
transmitted using a separate, dedicated signaling channel.
Robbed Bit Signaling (RBS) - ANS-An implementation of channel associated signalling
(CAS) that steals the eighth bit of every sixth frame of a digital T1 circuit for signaling
information.
Q.931 - ANS-A signaling protocol used by ISDN CCS implementations.
Local Loop - ANS-The PSTN link between the customer premises (such as a home or
business) and the telecommunications service provider.
Private Branch Exchange (PBX) - ANS-A system that allows a company to run an
internal, private voice network; PBX systems are usually used in larger companies and
provide unique extensions to all devices.
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