NCTI Exam Fiber IV
The 10G-EPON access architecture supports two data rates in the upstream: 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 the difference between the FTTN Fiber-to-the-node and FTTCFiber-to-the-curb topologies?
An FTTC is allowed a smaller number of RF Radio frequency amplifiers between the optical fiber and the customer premises.
What can be used as a pulling line in a conduit that is missing a pull line?
An unused cable that is already installed in the conduit.
How are optical splitters used in the forward path?
As passive branching devices that divide an optical signal across multiple output fibers.
What is the proper way to handle fiber once it is spliced?
At the heat-shrink protective sleeve that has a steel bar inside it.
What is the wavelength allocation for video distribution (RF overlay) in broadband PON (BPON) access systems?
Between 1,550 and 1,560 nm
In a hybrid fiber/coax (HFC) fiber optic node, what are common voltages produced by DC power supplies?
Common voltages produced by DC power supplies include +5, +12, and +24 VDC.
Which of these are concerns for radio frequency over glass (RFoG) 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.
Which type of passive optical network (PON) architecture was formed to develop a cost-effective, high-bandwidth, easy-to-provision solution for connecting businesses, schools, libraries, and customer local area networks to the public Internet?
Ethernet PON (EPON).
What is one of the requirements that have been identified for next-generation access network architectures?
Expanded troubleshooting capability.
In a PON FTTx network, which OSP device contains fiber test points that will minimize service disruption to customers?
FDH
What are the characteristics of ITU-T International Telecommunication Union G.657 BIF Bend-insensitive fiber?
Flexible for installation in small spaces and has a small bend radius of 7.5 mm Millimeters or 10 mm.
Why do many optical nodes accept two independent power supplies?
For redundant powering of the node.
Which type of passive optical network (PON) access architecture replaced asynchronous PON (APON)?
Gigabit-capable PON (GPON).
The number of rectifiers used in a DC power plant design
Is dependent upon the load placed on the system.
Which of the following is true of a centralized power node?
It can accommodate multiple uninterruptible power supply (UPS) modules, batteries, and an on-site natural gas generator to facilitate power requirements for normal system operation only.
What is true about using a premade fiber-optic pigtail for splicing to patch panels or terminal equipment?
It is faster and more reliable than installing connectors in the field.
What is the purpose of the MST Multiport Service Terminal?
It provides access to connect fiber-optic cable drops from the customer premises to the network.
What is the purpose of the SDU?
It provides surge/circuit protection, test jack, wiring management, and fiber termination.
What is the main benefit of deploying WDM Wavelength division multiplexing technology?
It will increase the capacity of the existing fiber networks tenfold without adding any more fiber.
Which PON Passive optical network element uses patch panels?
ODN
What are the advantages of loose buffer tube fiber?
Offers best protection under high pulling tension and moisture with its fiber-coated gel.
What is a benefit of using a point-to-point (P2P) topology instead of a point-to-multipoint (P2MP) topology?
P2P topologies are more stable than P2MP topologies.
What is it about radio frequency over glass (RFoG) that made broadband cable operators envision using it to make a seamless transition from the legacy hybrid fiber/coax (HFC) architecture over to a gigabit-capable passive optical network (GPON) or Ethernet passive optical network (EPON)?
RFoG can operate in parallel with GPON and EPON, operating independent of the PON communications protocols and data rates.
What is the best approach to repairing an aerial fiber-optic drop cable for FTTx applications?
Replace the entire section of fiber drop cable.
What are the two accepted methods for pulling fiber-optic cable off the cable reel as part of an aerial installation?
The back-pull method and the drive-off method.
In underground installations, what are two recommended techniques that prevent the pulling tension through the conduit from exceeding the pulling tension specification of the fiber-optic cable?
The midpoint pull and the intermediate pull.
What is true of the following types of uninterruptible power supplies (UPS)?
The offline type routes incoming power directly to connected devices and switches to battery backup during a power interruption.
How is the high air speed blowing (HASB) method of installing fiber-optic cable in conduit different from other methods?
There is no need for a pulling rope in the conduit before the cable is installed.
What is true of online uninterruptible power supply (UPS) systems?
They are recommended for commercial applications such as data centers and telecommunications operations.
Why is -48 VDC (volts of direct current) with a positive ground used by the telecommunications industry?
This reverse polarity is a means of mitigating electrolytic corrosion on the outside plant.
What is an option available on most optical nodes for connecting to the power supply?
Through a power cable that is connected from the power supply directly to the power port of the node.
What is the core objective of the Data Over Cable Service Interface Specification (DOCSIS) Provisioning of Ethernet passive optical network (EPON), or DPoE, access architecture?
To make the EPON elements appear and operate as DOCSIS elements to the existing DOCSIS-based back office provisioning operations.
What is the purpose of the ground block?
To protect fragile electronics like TVs and STB Set-top boxes from damaging lightning strikes and power surges.
What are the three categories of the fiber-optic cable used to identify the location of the fiber in the network?
Trunk, branch, and drop.
What is unique about WDM-PON?
WDM-PON deployed in a greenfield system allows each subscriber to get their own designated wavelength.
When is it necessary to use the intermediate pull technique to install fiber-optic cable in conduit?
When the cable route has multiple 90° bends throughout.
What is the minimum clearance in the middle of a cable span between the power's secondary conductor and the fiber-optic cable belonging to a broadband cable operator?
30 inches.
Which element of a passive optical network (PON) consists of a downstream (forward path) optical transmitter, an upstream (return path) receiver, and a multiplexer/demultiplexer?
Optical line terminal (OLT).
When installing fiber-optic cable over coaxial cable, what should be done at the coaxial cable expansion loops?
Secure the fiber-optic cable to the strand across the coax cable loops using cable ties or support straps.
What parameter is critical in an OTDR when testing a PON with significant splitters losses?
High dynamic range.
When installing aerial fiber-optic cable employing the back-pull method, how should the cable trailer be positioned in order to keep the cable from rubbing on the pole or cable reel when pulled?
in line with the strand and at least twice the distance from the pole as the height from the ground to the set-up chute.
What is the one main function of the FDH Fiber distribution hub?
provides effective fiber management by grouping splitters into local serving areas.
What is the purpose of a fiber demarcation box?
It provides a safe place to splice, split, store, distribute, and cross-connect fiber optics.
What are some advantages of using flexible conduit?
Low coefficient of friction (COF) and the capability to bend around corners and obstructions with minimal splices.
Eliminating pulling lines using high air speed blowing (HASB) can achieve how much of a cost savings over conventional pulling techniques?
More than 40%.
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 an ONU/ONT?
A device that converts light to RF for coaxial distribution into the home.
