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VDV Chapter 1 Questions & answers with Complete solutions | Latest edition
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VDV Chapter 1 Questions & answers with Complete solutions | Latest edition
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VDV Chapter 1analog signal - ANS-An analog signal uses a property of the device that captures the
audio signal to convey audio information.
In today's world, where everything is connected through some form of cabling, electric
currents are used to send analog signals.
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.
Loop start signaling is the typical signaling type used in home environments. Loop start
signaling is susceptible to a problem known as glare.
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 system to avoid glare.
glare - ANS-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.
time-division multiplexing (TDM) - ANS-TDM allows voice networks to carry multiple
conversations at the same time over a single, four-wire path. Because the multiple
conversations have been digitized, the numeric values are transmitted in specific time
slots (thus, the "time division") that differentiate the separate conversations.
channel associated signaling (CAS) - ANS-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.
common channel signaling (CCS) - ANS-CCS dedicates one of the DS0 channels from
a T1 or E1 link for signaling information. This is often called out-of-band signaling
because the signaling traffic is sent completely separate from the voice traffic.
When using CCS configurations with T1 lines, the 24th time slot is always the signaling
channel. When using CCS configurations with E1 lines, the 17th time slot is always the
signaling channel.
Signaling System 7 (SS7) is an example protocol used by COs
robbed bit signaling (RBS) - ANS-Another name for CAS
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