In a hybrid fiber/coax HFC fiber optic node, what are common voltages produced by DC power supplies? - Common Voltage includes +5, +12 and +24 VDC
Why do many optical nodes accept two independent power supplies? - For redundant Powering of the node.
What is an option available on most opt...
Maintance Tech 2-3 Conventional NCTI
correct Answers
In a hybrid fiber/coax HFC fiber optic node, what are common voltages produced by DC
power supplies? - ✔ Common Voltage includes +5, +12 and +24 VDC
Why do many optical nodes accept two independent power supplies? - ✔ For
redundant Powering of the node.
What is an option available on most optical nodes for connectin to the power supply? -
✔ Through a power cable that is connected from the power supply directly to the power
port of the node.
Which of the following is true of a Centralized power node? - ✔ It can provide sufficient
power for a fiber-optic node, including outside plant amplifiers and customer premis
network interface devices (NID) for telephony service.
Why is -48VDC with positive ground used by the telecommunications industry? - ✔
This reverse polarity is means of mitigating electrolytic corrosion on the outside plant.
Why are backup AC generators included in many commercial AC uninterruptible power
supply (UPS) and DC power systems? - ✔ To provide AC power in the event of a
prolonged utility power interruption.
What is true of the following types of uninterruptible power supplies(UPS)? - ✔ The
offline type routes.
which of these are concerns for radio frequency over glass (RF0G) and, fiber-to-the-
x(FTTx) systems? - ✔ Consideration of how and who will provide AC power to the
optical network terminal (ONT) at the customer premises.
What is true of online uninterruptible power supply (UPS) systems? - ✔ They are
recommended for commercial applications such as data centers and
telecommunications operations.
The number of rectifiers used in a DC power plant design. - ✔ Is dependent upon the
load placed on the system.
What is a benefit of using point-to-point(P2P) topology instead of a point -to-
multipoint(P2MP) topology? - ✔ P2P topologies are more stable than P2MP topologies.
The 10G-EPON acces architecture supports two data rates in the upstrean what are
they? - ✔ 1 Gbps and 10 Gbps
, What is the maximum data rate the XG-PON1 (10G-PON) access architecture supports
in the upstream? - ✔ 2.5 Gbps.
What is one of the requirements that have been identified for next-generation access
network architectures? - ✔ Increased power consumption.
what is the core objective of docsis provisioning of EPON or DPoE, access
architecture? - ✔ To make the EPon Elements appear and operate as DOCSIS
elements to existing DOCSIS-based back office provisioning operations.
Which element of passive optical network consists of downstream (forward path) optical
transmitter, an upstream (returnpath) receiver, and a multiplexer/demultiplexer? - ✔
Optical line terminal (OLT)
Which types of passive optical network (PON) acces architecture replaced
asynchronous PON (APON). - ✔ Gigabit-capable PON (GPON).
Which type of passive optical network (PON) architecture was formed to develop a cost-
effective, high-bandwidth, easy-toprovision solution for connecting businesses, schools,
libaries, and customer local area networks to the public internet? - ✔ Ethernet PON
(EPON)
what is it abount radio frequency over glass (RFoG) that made broadband cable
operators envision using it to make a seamless transition from the lagacy hybrid fiber
architecture over to gigabit-capable passive optical network or ethernet passive optical
network? - ✔ RFoG can operate in parallel with GPON and EPON, operating
independent of the PON communications protocols and data rates.
Which type of optical coupler provides the least amount of insertion loss? - ✔ Fused.
typically, what is the first step to take when adjusting an optical receiver? - ✔ Turn on
the optical receiver.
What are the main elements of an optical receiver? - ✔ Demodilator, electrical
interface, optical detector, optical interface.
in networks transporting data rates that are higher than _____, Fabry-Perot (F-P), lasers
are considered inadequate. - ✔
What is one process that has to happen before digital modulation can occur in an
optical transmitter? - ✔ The data must be encoded.
What are the main elements of an optical transmitter? - ✔ Data encoder/modulator,
electrical interface, laser,optical interface.
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