Exam (elaborations)
VDV CHAPTER 1 QUESTIONS AND ANSWERS
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VDV CHAPTER 1 QUESTIONS AND ANSWERS
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Name: Score:25 Multiple choice questions
Definition 1 of 25
A method of signaling that relies on grounding wires connecting to a device to signal a new
call; typically used in PBX system to avoid glare.
both choices
ground start signaling
key system
neither choice
Definition 2 of 25
Uncompressed audio, uses 64kbps MOS=4.1
There are two forms of the G.711 codec: μ-law (used primary in the United States and Japan)
and a-law (used everywhere else). The quantization method described in the preceding
paragraph represents G.711 a-law. G.711 μ-law codes in exactly the opposite way.
G.711 is the "common ground" between all VoIP devices.
G.711
Q.931
H.323
G.811
Definition 3 of 25
Subjective. The test used to rate the quality of voice is simple: A listener listens to a caller say
the sentence, "Nowadays, a chicken leg is a rare dish," and rates the clarity of this sentence on
a scale of 1-5.
mean opinion score (MOS)
channel associated signaling (cas)
quality of service (qos)
quality of experience (qoe)
,Definition 4 of 25
Compressed, Uses 32 kbps MOS=3.92
G.363
G.73
G.726
G.1452
Definition 5 of 25
Another name for CAS
common channel signaling (ccs)
ground start signaling
robbed bit signaling (RBS)
loop start signaling
Definition 6 of 25
Glare occurs when you pick up the phone to make an outgoing call at the same time as a call
comes in on the phone line before the phone has a chance to ring.
glare
gawp
magnified
gaze
, Definition 7 of 25
Once two devices attempt to establish an audio session, RTP engages and chooses a random,
even UDP port number from 16,384 to 32,767 for each RTP stream. Keep in mind that RTP
streams are one way. If you are having a two-way conversation, the devices establish dual RTP
streams, one in each direction.
This port does not change for the duration of the audio session.
Time-division multiplexing (tdm)
Nyquist theorem
Real-time Transport Protocol (RTP)
Ntp (network Time protocol)
Definition 8 of 25
Key systems are geared around small business environments (typically less than 50 users).key
systems typically support fewer features and have a "shared line" feel. For example, you might
see a key system installed in a small insurance office where users all have four lines assigned to
their phone. If Joe were to use line 1, the line would appear busy for all users at the insurance
office.
colored coded system
automated attendant
ground start analog
key system
Definition 9 of 25
Signaling information is transmitted using the same bandwidth as the voice.
CAS actually "steal" binary bits that would typically have been used to communicate voice
information and use them for signaling.
time-division multiplexing (tdm)
channel associated signaling (CAS)
robbed bit signaling (rbs)
voice over ip (voip) dial peer
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