Data Over Cable Service Interface Specification Quiz

The Institute of Electrical and Electronics Engineers (IEEE).

The Society of Cable Telecommunications Engineers (SCTE).

The International Organization for Standardization (ISO).

The International Telecommunication Union (ITU).

Layers four through seven (Transport Layer, Session Layer, Presentation Layer, and Application Layer) are applied between the DOCSIS modem and CMTS.

Layers one through four (Simple Network Management Protocol, Trivial File Transfer Protocol, Dynamic Host Configuration Protocol, and E-mail) are applied between the DOCSIS modem and CMTS.

Layers four through seven (Physical Layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS.

Layers one through four (Physical Layer, Data Link Layer, Network Layer, and Transport Layer) are applied between the DOCSIS modem and CMTS.

Increased bandwidth of the upstream and advanced access systems so that higher orders of modulation (and higher data rates) are possible.

Increased bandwidth of the upstream and advanced access systems so that lower orders of modulation (and higher data rates) are possible.

Increased bandwidth of the upstream so that enhanced security and adaptive equalization in the upstream path for improved data throughput are possible.

Increased bandwidth of the downstream with advanced access systems so that higher orders of modulation (and higher data rates) are possible.

TCP/IP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into four elements: the packet sequence; the data; the destination address; and the checksum of data.

TCP/IP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into two elements: the data and the destination address.

SNMP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into four elements: the packet sequence; the data; the destination address; and the checksum of data.

SNMP provides the basic protocol for directing data traffic over the Internet by dividing the data packet into two elements: the data and the destination address.

Thin clients are not capable of running applications independent of the server. Thick clients are capable of downloading and running installed applications independent of a server.

Thin clients are small portable devices such as laptop computers and smart phones. Thick clients are stationary devices such as desktop and mainframe computers.

Thin clients will only work with one dedicated server. Thick clients will work with multiple servers simultaneously.

Thin clients are used for home applications such as game consoles or to download movies. Thick clients are used for business applications in computers.

When an upstream transmission request is received, the MAC protocols instruct the cable modem termination system (CMTS) when to transmit, its bandwidth, and its transmission interval to prevent or decrease the number of upstream packet collisions. The reduction of collisions increases the upstream transmission efficiency since colliding packets need not be resent.

When a downstream transmission request is received, the MAC protocols instruct the cable modem termination system (CMTS) when to transmit, its bandwidth, and its transmission interval to prevent or decrease the number of downstream packet collisions. The reduction of collisions increases the upstream transmission efficiency since colliding packets need not be resent.

When a downstream transmission request is received, the MAC protocols instruct the cable modem when to transmit, its bandwidth, and its transmission interval to prevent or decrease the number of upstream packet collisions. The reduction of collisions increases the upstream transmission efficiency since colliding packets need not be resent.

When an upstream transmission request is received, the MAC protocols instruct the cable modem when to transmit, its bandwidth, and its transmission interval to prevent or decrease the number of upstream packet collisions. The reduction of collisions increases the upstream transmission efficiency since colliding packets need not be resent.

Channel bonding combines the data throughput of a single channel with a number of channels to achieve a maximum data throughput equal to the cumulative total of the bonded channels.

Channel bonding ties the downstream and upstream RF data carriers to fixed frequencies so that the cable modem always knows what frequency to tune to receive downstream data.

Channel bonding combines the data throughput of up to eight adjacent data channels to create a single wide bandwidth data channel to achieve a maximum data throughput equal to the cumulative total of the bonded channels.

Channel bonding ties the downstream cable modem carrier to the out-of-band (00B) data carrier sent to the digital set-top box (STB) to enable the cable modem to receive television signals over the Internet.

When powered on and connected to cable system, the cable modem receives an upstream channel descriptor (UCD) which contains upstream transmission parameters, including frequency and carrier level.

After it is authorized for service, the cable modem receives an upstream channel descriptor (UCD) which contains upstream transmission parameters, including frequency and carrier level.

The installer enters the modem's upstream transmission parameters, including frequency and carrier level, into the modem's configuration file during its activation.

During initialization the cable modem receives upstream transmission parameters, including frequency and carrier level, that were entered for the modem's location in the system.

The shared services environment makes optimum use of the network to efficiently transport the continuous data traffic to and from the modems.

The shared services environment follows the same model for television content distribution. Instead of the customer choosing which channel to watch, the cable modem chooses which data packet to receive and then decode.

The shared services environment is a less expensive alternative than dedicated connections, which is most efficient for transporting the intermittent data traffic to and from the modems.

The shared services environment makes optimum use of the network to efficiently transport the intermittent data traffic to and from the modems.

Ranging and automatic adjustment.

Characterizing.

Registration

Synchronization of data.

Intermittent operation which is a symptom of noise or interference in the downstream.

Intermittent operation which is a symptom of noise or interference in the upstream.

Buzzing audio and horizontal lines, which become quite obvious on digital channels.

The video and audio carrier levels to make sure that they are on frequency and that their respective levels are 15 dB, plus or minus 2 dB.

The lower the bandwidth, the higher the data throughput, the higher the susceptibility to noise.

The higher the bandwidth, the higher the data throughput, the lower the susceptibility to noise.

The higher the bandwidth, the lower the data throughput, the higher the susceptibility to noise.

The higher the bandwidth, the higher the data throughput, the higher the susceptibility to noise.

Noise funneling the accumulation of noise from different sources, travels downstream from the customer premises to the headend.

Ingress that appears in the upstream frequencies, which is of no consequence in the downstream, must be identified and eliminated.

Ingress that appears in the downstream frequencies, which is of no consequence in the upstream, must be identified and eliminated.

Noise funneling the accumulation of noise from different sources, travels downstream from the headend to the customer premises.

Two-way house amplifiers, window filters, or step attenuators.

High-pass filters, two-way house amplifiers, or step attenuators.

High-pass filters, window filters, or step attenuators.

High-pass filters, window filters, or two-way house amplifiers.

5 dB.

No change.

10 dB.

15 dB.

ANSI/TIA/EIA-5708.

T568B.

T568A.

Universal Service Order Codes (USOC).

Using an unshielded twisted-pair (UTP) cable.

Using a flat silver-satin telephone cable.

Using a shielded twisted-pair (STP) cable.

Using the universal serial bus (USB) cable.

The cable modem power supply should be plugged into a dedicated electrical outlet that will not be switched off and has no other appliances or devices plugged into it.

The cable modem power supply should be plugged into an electrical outlet that will not be switched off, near the customer's computer, and in a well-ventilated area so that it remains cool.

The cable modem power supply should be plugged into an electrical outlet that will not be switched off and because of its size is not likely to be unplugged.

The cable modem power supply should be plugged into an electrical outlet that will be switched off and because of its size is not likely to be unplugged.

Scanning for downstream carrier.

Ranging.

Obtaining an IP address.

Downloading configuration data.

Rebooting the computer ensures that the modem provisioning software installed on the computer remains in place.

Rebooting the computer confirms that any changed settings are stored in the computer's memory and that the computer and modem continue to operate together after rebooting.

Rebooting the computer prevents the unintentional downloading of modem-specific features into the customer's computer.

Rebooting the computer ensures that the modem installation client is installed in the customer's computer.

Ingress and noise from each drop is filtered at each common point, affecting only the signals from that drop's customer premises equipment (CPE).

Ingress and noise from each drop is carried independently over fiber to the headend where the noise is filtered out.

Ingress and noise from multiple drops along a service area funnels into a common point, affecting all signals from that service area.

Ingress and noise from multiple drops funnels into multiple points along the return path, affecting just the signals from the first service area.

The use of a step attenuator or a high-pass filter on the combiner at the headend will block any noise generated on the drop in the return frequencies from entering the leg.

The use of a step attenuator between the drop and the cable modem will block any noise generated on the drop in the return frequencies from entering the leg.

The use of a diplex filter at the ground block will block any noise generated on the drop in the return frequencies from entering the leg.

The use of a high-pass filter at the tap will block any noise generated on the drop in the return frequencies from entering the leg.

At the directional coupler of the drop farthest away from the node.

At the return amplifier farthest away from the node.

At the node.

At the tap farthest away from the node.

Installing separate drops for high-speed data (HSD), cable telephony, and cable television service.

Splitting the distribution legs into separate optical return paths.

Funneling in more distribution legs into a single optical node.

Reducing the number of cable modem termination system (CMTS) ports in the headend.

Thermal noise is always present in a transmission path and is created by the temperature fluctuations of the laser in an optical node.

Thermal noise is microwave ingress in a transmission path and is caused by local public safety radio transmissions.

Thermal noise is intermittent in a transmission path and is caused by the occasional electrical switching device like a motor or transformer.

Thermal noise is caused by fluctuations in electron density within amplifier circuitry. As the signal passes through an amplifier, thermal noise is generated and added to the amplified signal.

STBs are always in communications with the headend. A non-responsive STB generates an e-mail alert.

STBs send a status message to the cable modem to let it know when it loses contact with the headend.

STBs are polled to see if they respond and a report is created. Non-responsive STBs can result in a significant loss of revenue.

STBs are polled by the EMTA periodically to see if they respond. Non-responsive SIGs are replaced.

A ground fault detector can easily isolate the cause of cable telephony or HSD cable modem problems in the drop system.

A modem emulator function in a signal level meter (SLM) can aid in troubleshooting the cause of cable telephony or HSD cable modem problems in the drop system.

A digital multimeter (DMM) can easily isolate the cause of cable telephony or HSD cable modem problems in the drop system.

A return path tester can be used to easily isolate the cause of cable telephony or HSD cable modem problems in the drop system.

A forward sweep from 54-860 MHz will deliver the most accurate alignment results.

A return sweep from 5-42 MHz will deliver the most accurate alignment results.

Injecting RF frequencies from 5-108 MHz at 6 MHz intervals will deliver the most accurate alignment results.

Injecting RF frequencies from 5-42 MHz at 6 MHz intervals will deliver the most accurate alignment results.

Service interruptions from laser clipping.

Fluctuations in thermal noise.

Six MHz intermodulation beats due to common path distortion.

Fast transient signals such as impulse noise.

Most cable modems, test generators, and set-top boxes (STB) have diagnostic pages.

Most leakage detectors, cable emulators, and return path testers have diagnostic pages.

Most cable modems, embedded multimedia terminal adapters (EMTA), and set-top boxes (STB) have diagnostic pages.

Most leakage detectors, cable emulators, and test generators have diagnostic pages.

Attenuation in the return path is primarily due to fiber-optic cable.

Attenuation in the return path is primarily due to the coaxial cable.

Attenuation in the return path is primarily due to the passive devices.

Attenuation in the return path is primarily due to the active devices.

Long-loop AGC adjusts the transmit levels of the customer premises equipment.

Long-loop AGC adjusts the receive levels of the customer premises equipment.

Long-loop AGC adjusts the transmit levels from the headend to the customer premises equipment.

Long-loop AGC adjusts the receive levels from the headend to the customer premises equipment.

Each return amplifier must be adjusted so that the levels received at the next amplifier are 25 dBmV.

The output of each return amplifier must be adjusted so that the input levels received at the next amplifier are the same.

Each return amplifier must be adjusted by the decibel (dB) value of the directional coupler (DC).

Each return amplifier must be adjusted so that the levels received at the next amplifier are within 15 dB of each other.

Most cable modems are configured to operate above 38 and below 42 MHz.

Most cable modems are configured to operate above 5 and below 20 MHz.

Most cable modems are configured to operate above 38 and below 54 MHz.

Most cable modems are configured to operate above 28 and below 38 MHz.

The drop cable loss is 3.2 dB plus 7.0 dB (the loss of a three-way splitter) plus 9 dB (DC loss), for a total of 19.2 dB in drop return path loss.

The drop cable loss is 3.2 dB minus 3.5 dB (the hot-leg loss of a three-way splitter) plus 9 dB (DC loss) for a total of 8.7 dB in drop return path loss.

The drop cable loss is 3.2 dB plus 3.5 dB (the hot-leg loss of a three-way splitter) plus 9 dB (DC loss), for a total of 15.7 dB in drop return path loss.

The drop cable loss is 3.2 dB plus 3.5 dB (the hot-leg loss of a three-way splitter) minus 9 dB (DC loss), for a total of -2.3dB in drop return path loss.

Overloaded input levels to a house amplifier that are reflected back to their source.

The use of splitters instead of directional couplers in the drop system.

Unpowered house amplifiers that reflect signals back to their source.

Loose or bad connections at the tap or unterminated splitter ports in the drop system.

Impulse noise can be reduced by transmitting power on the distribution amplifiers.

Impulse noise can be reduced by tightening all connections and installing 75 Q terminators on unused tap ports.

Impulse noise can be reduced by locating taps and splitters close to switching power supplies.

Impulse noise can be reduced by tightening all connections and installing 10 dB attenuator pads on all used tap ports.

At the coax interface on the node.

At the distribution amplifier.

The customer premises and the drop cable.

At the headend.

Window filters act on specific frequencies from 5-42 MHz.

Window filters act on specific frequencies above 5-42 MHz.

Step attenuators provide 100 dB of attenuation on frequencies from 5-42 MHz.

High-pass filters block all frequencies above 108 MHz.

Replacing tap plates of 17 dB or less with higher value tap plates.

Installing high-pass filters on all unused tap ports.

Installing high-pass filters on tap ports that are 17 dB or less.

Installing terminators on all unused tap ports.

Compared to the downstream path, the narrower bandwidths and lower orders of modulation used to transport data over the return path cause the downstream and upstream data throughput to be unequal or asymmetrical.

Compared to the downstream path, the narrower bandwidths and lower transmit power of the modems used to transmit data over the return path cause the downstream and upstream data throughput to be unequal or asymmetrical.

Compared to the downstream path, the narrower bandwidths and higher orders of modulation used to transport data over the return path cause the downstream and upstream data throughput to be unequal or asymmetrical.

Compared to the downstream path, the higher bandwidths and lower orders of modulation used to transport data over the return path cause the downstream and upstream data throughput to be unequal or asymmetrical.

Channel bonding, IP version 6 (IPv6) support, and enhanced use of IP broadcast.

Channel bonding, IP version 6 (IPv6) support, and enhanced use of IP multicast.

Channel bonding, IP version 6 (IPv6) support, and best effort delivery of IP multicast.

Channel bonding, IP version 6 (IPv6) support, and exclusive quality of service (QoS).

38 Mbps.

152 Mbps.

108 Mbps.

76 Mbps.

IP version 4 (IPv4), IP version 6 (IPv6), dynamic host configuration protocol (DHCP), and dual-stack mode (DPM).

IP version 4 (IPv4), IP version 6 (IPv6), alternate provisioning mode (APM), and dual-stack mode (DPM).

IP version 4 (IPv4), IP version 6 (IPv6), alternate provisioning mode (APM), and dynamic host configuration protocol (DHCP).

IP version 4 (IPv4), IP version 6 (IPv6), IP multicast, and dual-stack mode (DPM).

IP multicast traffic is only sent to specific modem addresses on the network; IP broadcast traffic is sent to all modems on the network.

IP multicast traffic is only sent to one modem at a time on the network; IP broadcast traffic is sent to all modems on the network all the time.

IP multicast traffic is sent to all modems on the network; IP broadcast traffic is only sent to specific modem addresses on the network.

IP multicast traffic is only sent to a maximum of 100 modem addresses on the network; IP broadcast traffic is sent to all modems on the network.

The ground block.

The network interface card (NIC) in the customer's computer.

The cable modem.

The customer's wireless router.

Because data throughput is an obscure measurement that the customer is unable to relate to their service.

Because the data throughput measurement is derived from data packets traveling downstream only, separating downstream issues from upstream issues.

Because data throughput is an easy measurement that can be accurately obtained by the customer going to a generic speed test site on the Internet.

Because data throughput can be compromised by traffic congestion and errors introduced during transport through the network.

26 dB or less.

32 dB or greater.

32 dB or less.

26 dB or greater.

From the customer's computer to the throughput server that is connected to the cable modem termination system (CMTS) in the headend or hub.

From the customer's computer to a Web site server on the Internet.

From the customer's computer to a speed test Web site on the Internet.

From the customer's computer to a special cable modem located in the headend or hub.

Dynamic host configuration provisioning (DHCP) and dual-stack provisioning mode (DPM).

Alternate provisioning mode (APM) and multistack provisioning mode (MPM).

Alternate provisioning mode (APM) and dual-stack provisioning mode (DPM).

Alternate provisioning mode (APM) and dynamic host configuration protocol (DHCP) mode.