Broadband Digital Installer
Which DOCSIS version was the first to provide an option for raising the top frequency of the upstream spectrum to 85 megahertz (MHz) in order to create enough bandwidth for upstream carriers from modems running on previous DOCSIS modems?
DOCSIS 3.0
What functionality is integrated in all modern signal level meters (SLM) to measure specific parameters of a digital modulation carrier containing digital television (DTV) and Data Over Cable Service Interface Specification (DOCSIS) signals?
Digital signal analyzer functionality.
Generating a dial tone in either a traditional telephone call or PacketCable VoIP call is similar, except?
Equipment in the central office (CO) for plain old telephone service (POTS) senses the change in voltage and generates a dial tone where the embedded multimedia terminal adapter (EMTA) senses the change and generates a dial tone in PacketCable.
What Internet protocol (IP) connectivity modes are supported in DOCSIS 3.0 and 3.1?
IPv4 only, IPv6 only, alternate provisioning mode (APM), and dual-stack provisioning mode (DPM).
What consideration should be made when choosing the location to place or mount an EMTA?
If it is near an unswitched electrical outlet to prevent inadvertent service interruptions.
What is one operation to check after adding a new modular telephone jack?
Inbound call capability
Which of the following home automation platfomrs does not support Wi-Fi devices?
Nexia
When inserting conductors into modular plugs on a crossover telephone cord, how should the conductor colors be crimped on each end of the cord?
One end: red and green for Pair 1, and black and yellow for Pair 2. Other end: green and red for Pair 1, and yellow and black for pair 2.
What features were introduced with the 3.1 Version of (DOCSIS 3.1) to increase the downstream and upstream data throughput?
Orthogonal frequency division multiplexing (OFDM) and low-density parity-check (LDPC).
Why is packet-switching technology considered to be more efficient than circuit switching technology?
Packet-switching operates over a shared network and occupies the network only for the duration of time it takes to transport the data packet.
Power Line carrier technology is committed over which of the following mediums?
Power Lines
What are some of the standards that came out of building the digital pub switched telephone network (PSTN)?
Pulse code modulation (PCM), digital signal (DS) hierarchy, and the T-carrier trunk hierarchy
What requirements were needed for PacketCable to deliver a quality and reliable telephone service over a DOCSIS access network?
Quality of Service (QOS) controls, enhanced security and adaptive equalization in the upstream path.
Which wiring configuration is only used for voice systems and should never be used when wiring modular data plugs or jacks?
T568B
In the DOCSIS HFC (hybrid fiber/coax) access network, an embedded multimedia terminal adapter (EMTA) includes?
Telephone jacks and circuitry to send and receive telephone calls over the DOCSIS network.
The First version of DOCSIS was approved as an international standard by what organization?
The International Telecommunication Union (ITU)
What happens if a DOCSIS modem is unable to acquire the current time and date from one or more time-of-day (ToD) servers during registration with the CMTS?
The Modem proceeds to an operational state and issues at least one ToD request per 5-minute period for each server specified until local time is established.
What differentiates PacketCable voice over internet protocol (VoIP) from VoIP service offered by other providers?
The architecture and handling of IP voice packets from the PacketCable managed IP network.
A cable gateway can replace which broadband cable operator supplied devices?
The cable gateway could replace a cable modem and STB
What information does a DOCSIS 3.1 modem provide in its Bonded Initial Ranging Request (B-INT-RNG-REQ) message to the CMTS?
The modem's downstream service group (DS-SG), if determined.
Which Open Systems Interconnection (OSI) reference model layers does the Media Access Control (MAC) Layer in the Data Over Cable Service Interface Specification (DOCSIS) overlap so that the media access control (MAC) can be used by the cable modem termination system (CMTS) to differentiate between cable modems?
The physical and data link layers.
How does the insulation displacement connector modular telephone jack differ from the screw down post modular telephone jack?
The wires are connected using IDC termination slots, which hold the twisted-pair wires.
What communications access technology does the first version of DOCSIS (DOCSIS 1.0) use to send data upstream over the networks radio frequency (RF) return path?
Time Division Multiple Access (TDMA)
If a residence contains many modular jacks, a distribution device may be used in addition to the network interface device (NID). What components are contained in a distribution device?
Tip and ring screw or punch down terminals, which are used to connect the inside wiring.
Why would a cable operator consider activating device class identification (DCI) as part of a DOCSIS modem's initialization?
To enable the cable operator to define special modem classes or service levels that can be prioritized for ranging after a massive outage
Why must an internal battery be installed in an EMTA?
To qualify as a carrier class telephone service and enable uninterrupted operation during short power outages.
After mounting and wiring a new modular telephone jack in a start installation, where should the un-shielded twisted-pair (UTP) cable from the new modular jack be connected?
To the tip and ring screw terminals or insulation displacement connection (IDC) on the telphone distribution device.
Which powerline protocol is stated to be 100 to 1000 times more reliable that X10?
UPB
What is the maximum amount of wire to be untwisted to maintain CAT-5E electrical characteristics?
1/2 inch
When installing a modular telephone jack by mounting and wiring the jack using a screw-down post at the customer premises, how much insulation should be stripped from each individual copper conductor with a wire stripper?
1/2 inch to 3/4 of an inch.
What is the maximum data rate of 802.11b network?
11 mbps
When routing and attaching interior un-shielded twisted-pair (UTP) cable, what is the minimum separation distance you should maintain between any telecommunications or data cable and electrical power conductors?
2 inches
Out of the 40 channels that Bluetooth Low Energy works within the 2.4 GHz spectrum, how many of those channels are advertising channels?
3
Generally speaking, a wide area network (WAN) can be described as?
A network comprised of several local area networks (LAN) and metropolitan are networks (MAN) interconnected into a single network covering a large geographic are.
In accordance with requirements set by the National Electrical Code (NEC), several different cable types can be used for residential inside wiring. What is a CMR Cable?
A riser rate shielded twisted pair cable.
Topology refers to the arrangement used in routing and connecting inside wiring to the network interface device (NID) or distribution device, How is the star topology arranged?
A separate twisted-pair cable is routed to each modular jack from the NID.
Which protocol is best for exchanging data over short distances?
Bluetooth
How does a DOCSIS modem receive its Internet Protocol (IP) address?
From a dynamic host configuration protocol (DHCP) server that provides the CMTS with the modem's IP address, which is forwarded to the modem during initialization.
A modular plug contains four-, six-, or eight-pin positions. Each position is numbered and is used to terminate a specific tip or ring wire from a quad or twisted-pai cable. How are the pins on a modular jack numbered?
From left to right, with the locking tab down.
In a home that has an addition, what type of wiring topology is it most likely going to require?
Hybrid topology
In a single-family residence, the telephone company interface is typically located where?
In the Network Interface Device (NID) on the outside of the customers premises.
For an EMTA to receive an authorization key for telephone service, what is required of the MAC address?
It must be assigned to a customer account in the billing system database which updates the CMTS.
What type of security does the baseline privacy interface (BPI) protocol provide?
It prevents a cloned modem from full, illegal, access to the network.
What is the purpose of the Network Interface Device (NID) that is installed by the telephone company?
It serves as the demarcation point between the telephone company's outside network and the customer premise's inside wiring.
How should a technician check of crosstalk in a multiline telephone installation?
Listening for tones on one line while dialing out on another line.
Which type of twisted-pair inside wiring installation tool helps bend and wrap the tip and ring conductors of the twisted-pair, inside telephone wiring around the tip and ring binding posts on a network interface device (NID)?
Long-nose pilers
What is the last step in a cable modem's registration?
When the cable modem termination system (CMTS) receives a registration acknowledge (REG-ACK) message confirming the modem's registration.
Which protocol started out as a power line-based system utilizing the existing power lines within a home and eventually gave way to wireless/wired combination systems?
X10
Which of the following ZigBee devices do not have the ability to route commands and can only send and receive commands?
ZigBee End Device
Which of the following is an open source protocol that utilizes mesh networking to relay commands to connected devices within the customer premises?
Zigbee
Which of the following statements best describes iControl?
iControl is the User Interface (UI) and the User Experience (UX) of home automation for the majority of all US cable service providers.
What instructions might a cable modem termination system (CMTS) send in a ranging response (RNG-RSP) message to modify the cable modem's transmission parameters?
An adjustment to the modem's timing interval, transmit frequency, or power level.
What does a DOCSIS 3.1 seek first when synchronizing with the CMTS in order to receive operation?
An orthogonal frequency division multiplexing (OFDM) channel that contains a set of contiguous subcarriers called the PHY link channel (PLC).
What messages must a cable modem receive from the downstream signal in order to begin a transmitting relationship with the CMTS?
An upstream channel descriptor (UCD) message, a symbol timing message (SYNC), and a bandwidth allocation message (MAP).
Why are the data throughput rates for both downstream and upstream in DOCSIS networks asymmetrical?
Because the narrower bandwidths and lower orders of modulation for the return path carriers cause the DOCSIS downstream and upstream data raters to be unequal or asymmetrical.
One obstacle to wide-spread adoption of early voice over internet protocol (VoIP) applications was?
Both calling and receiving parties had to have computers that were turned on and running VoIP software.
Which of the following typologies starts at the network interface device (NID) and routes through the customer premises from one modular jack to the next?
Bus Topology
All telephone cables are labeled with either a level or category (CAT) number that designates the cable's performance criteria. How do CAT-1, CAT-2, and CAR-3 cable compare to CAT-5e and higher cables?
CAT-1 T through CAT-3 are used only for voice applications; CAT-5e and higher are used for voice and data.
What category of cable is best suited for data-centers and large enterprise networks?
CAT-7
Using a digital signal analyzer, what measurements are typically taken to troubleshoot and diagnose a digital television (DTV) signal?
Carrier average power level, modulation error ratio (MER), and bit error ratio (BER).
After verifying the dial tone from an EMTA what is the next step in verifying the EMTA's operational status?
Checking that the EMTA dials and connects properly by making local and long-distance calls.
What Criteria does the DOCSIS certification process ensure?
Compliance with the DOCSIS standard and interoperability between suppliers.
A constant bit Rate (CBR) telephone system is considered to be circuit-switching technology because the analog audio signal is?
Converted into a digital DS0 circuit and switched to other cable telephony customers or to the telephone company's network.
Where do DOCSIS modems receive their configuration files, billing system messages and access control messages from?
From the CMTS (headend) which interfaces with the operations support system (OSS) and acts as a proxy or messenger that transfers messages and files between the modems and the respective servers.
Which Layers of the Open Systems Interconnection (OSI) reference model are specific to cable networks and are present only between DOCSIS modems and the CMTS?
Layers 1-4 (Physical Layer, Data Link layer, Network layer, and transport layer) are applied between the DOCSIS Modem and CMTS.
What is the first step in pre-qualifying (i.e., inspecting and evaluating) a new customer's existing telephony service?
Locate all active telephones and jacks