CCT4 Study Guide 2011

Bi-Directional Pictures (B-Pictures) use both past and subsequent pictures to calculate the compressed picture data. B-Pictures are a type of video compression technique that relies on motion compensation to reduce the amount of data needed to represent a video frame. By using information from both past and future frames, B-Pictures can accurately predict the motion of objects in the video and only encode the differences between frames. This helps to achieve higher compression ratios and reduce the overall file size of the video.

The wireless standards that have an operating range of 100-150ft are B & G.

When a customer orders Business Class Service, one of the technician's responsibilities is to perform a site survey and installation. This involves assessing the customer's location to determine the most suitable setup for the service and then physically installing the necessary equipment and infrastructure. This step ensures that the service is properly installed and configured to meet the customer's requirements and expectations.

The picture likely shows the process or location of upstream ingress. This term refers to the movement or flow of data or signals from a downstream location or device to an upstream location or device. It is often used in telecommunications or computer networking to describe the transmission of information in the opposite direction of the usual flow. The picture may depict the equipment or infrastructure involved in this process.

In a 256QAM (Quadrature Amplitude Modulation) system, the number of bits represents the number of different amplitude and phase combinations that can be used to encode data. In this case, 256QAM can represent 256 different combinations, which can be represented by 8 bits. Therefore, the correct answer is 8.

A pad is used to attenuate the signal, meaning it reduces the signal strength, in order to bring it within the acceptable input range of the amplifier. This is necessary because if the signal is too strong, it can overload the amplifier and cause distortion or other issues. The pad acts as a barrier between the source of the signal and the amplifier, ensuring that the signal is at an appropriate level for optimal performance.

When the triggering condition is met, the virus releases its payload, which refers to the malicious code or actions that the virus carries out. This payload can include various harmful activities such as deleting files, stealing data, or spreading the virus to other systems. Therefore, the correct answer is "Delivery" as it accurately describes the process of the virus transmitting its payload to the targeted system or device.

A switch is a networking device that connects multiple devices within a Local Area Network (LAN). It operates at the data link layer of the OSI model and uses MAC addresses to forward data packets to the intended destination device. Unlike a router or gateway, a switch does not perform any network address translation or routing functions. Instead, it simply creates a network segment and allows devices to communicate with each other within that segment. Therefore, a switch is the correct answer as it best fulfills the given requirement.

The correct answer is Network IP, Routable IP, Gateway IP, Broadcast IP. This order is based on the hierarchy of IP addresses. The Network IP is the lowest value as it represents the network address. Routable IP comes next as it refers to the IP address that can be routed on the internet. Gateway IP is higher as it represents the IP address of the network gateway. Broadcast IP is the highest value as it is used to send data to all devices on a network.

The correct answer is "Housing" because the housing of a CATV system serves as a protective enclosure for the components inside. It acts as a barrier to prevent stray radio frequency (RF) signals from entering the system and interfering with the signals being transmitted. The housing also helps to maintain the integrity and reliability of the CATV system by shielding it from external factors such as moisture, dust, and physical damage.

A 110-Block allows for the connection and organization of phone and data lines. It is a type of punch-down block that is commonly used in telecommunications and networking to terminate and connect wires. The 110-Block provides a reliable and efficient method for managing phone and data connections, making it a suitable choice for telecommunications infrastructure. However, it does not have any specific functionality related to A/C (air conditioning) systems.

New Global Telecom (NGT) is the correct answer because it is the only option that makes sense in the context of the question. The acronym NGT is commonly used to refer to the company New Global Telecom, which is a telecommunications company. The other options, such as New Global Telephone, New Global Telecommunications, and New Global Tiara, do not align with any known or commonly used acronyms in the telecommunications industry. Therefore, the most logical and plausible option is New Global Telecom.

Proof of Performance tests help to ensure that cable systems' forward signals meet FCC regulations. These tests measure various parameters such as signal strength, signal quality, and signal integrity to verify that the cable system is operating within the required specifications. By conducting Proof of Performance tests, cable operators can ensure that their systems are delivering the desired performance to subscribers and meeting the regulatory standards set by the FCC.

A base map is a map that serves as a foundation for other maps or overlays. It typically includes essential features such as lakes, rivers, streets, and boundaries. This type of map provides a basic understanding of the geographic area and can be used as a starting point for various purposes, such as urban planning, infrastructure development, or environmental studies. It is often used as a reference map for adding additional information or layers in more detailed maps.

An acceptable carrier to hum ratio is 30db or 3%. This means that the ratio between the carrier signal and the hum signal should be at least 30db or the hum signal should be less than 3% of the carrier signal. This ensures that the hum noise is minimized and does not significantly affect the quality of the carrier signal.

A Power Diplex is a device that separates or combines the AC current's two parts: the AC power and the RF broadband signals. This means that it allows the AC power and RF signals to be transmitted or received separately or combined, depending on the application. It is commonly used in telecommunications and broadcasting systems to ensure efficient and reliable transmission of both power and RF signals.

Automatic Gain Control (AGC) is a technique used to automatically adjust the gain of a signal to compensate for fluctuations in the input signal. It ensures that the output signal remains at a consistent level, regardless of variations in the input. AGC is commonly used in audio systems, communication systems, and other applications where maintaining a constant signal level is important. By adjusting the gain, AGC helps to prevent distortion and ensures that the signal can be properly processed or transmitted.

A /29 subnet mask allows for 8 IP addresses. This is because a /29 subnet has a block size of 8 (2^3), meaning it can accommodate 8 unique addresses. Out of these 8 addresses, 2 are reserved for network and broadcast addresses, leaving 6 usable addresses for hosts. Therefore, the total number of IP addresses for a /29 subnet is 8.

The Tel 7 flashing slowly indicates a Line Card Error. This means that there is an issue with the line card, which is a hardware component responsible for connecting the telephone line to the system. The slow flashing rate, about 1 flash per second, suggests a problem with the line card's functionality or connection.

Carrier to beat ratios greater than 57db are far enough below desired carrier level to be of little concern to the average viewer. This means that any carrier to beat ratio that is higher than 57db will not significantly affect the quality or experience of the average viewer.

Forward Error Correction (FEC) is a method used in digital communication systems to add extra data bits to the transmitted bit stream. These additional bits are used to detect and correct errors that may occur during transmission. By including redundant information, FEC allows the receiver to identify and fix errors without the need for retransmission. This helps to improve the overall reliability and quality of the transmitted data.

A diplex filter is a device that separates and recombines the forward and reverse signals from a coaxial cable. This allows the signals to be routed to the appropriate components within the amplifier station. The diplex filter helps in managing the flow of signals and ensures that the forward and reverse signals do not interfere with each other. It is an essential component in maintaining signal integrity and optimizing the performance of the amplifier station.

DTCP (Digital Transmission Content Protection) is a cryptographic protocol that is used to protect audio and video content from illegal copying. It ensures that the content being transmitted or streamed is encrypted and cannot be easily intercepted or copied without proper authorization. DTCP provides a secure communication channel between devices, such as TVs, set-top boxes, and other multimedia devices, to prevent unauthorized access and copying of copyrighted content. By implementing DTCP, content creators and distributors can protect their intellectual property and prevent piracy.

The total number of IP addresses for a /28 subnet is 16. A /28 subnet has a subnet mask of 255.255.255.240, which means that the first 28 bits are used for network identification and the remaining 4 bits are used for host identification. With 4 bits for host identification, we can have 2^4 = 16 possible combinations, which translates to 16 usable IP addresses in the subnet.

The correct answer is "2+ Last 3 Digits". This suggests that the private numbering plan uses a format where the number starts with a 2, followed by the last 3 digits of the phone number. This format is likely specific to a certain area or organization that has implemented this private numbering plan.

When ingress allows a locally broadcast TV channel's signal to enter the TV along with the channel's signal supplied by the network, a "leading ghost" appears. This means that the original signal is being interfered with or distorted by another signal, creating a ghost-like image that appears slightly ahead of the original image.

In a 16QAM (Quadrature Amplitude Modulation) carrier, each symbol represents 4 bits of information. This is because 16QAM uses a combination of 16 different amplitude and phase levels to represent the data. Since each level can represent 4 bits (2^4 = 16), the number of bits in a 16QAM carrier is 4.

The correct answer is camouflage. The explanation for this is that the virus creates a different fake code each time it replicates itself in order to break up its signature. This means that the virus is disguising itself or hiding its true identity by constantly changing its code, making it difficult for detection and identification.

Network Address Translation (NAT) is a technique that allows multiple hosts or computers to share a single IP address for accessing the internet. NAT works by translating the private IP addresses of the devices on a local network into a single public IP address that can be recognized and routed on the internet. This allows for more efficient use of IP addresses and helps to secure the internal network by hiding the individual IP addresses of the devices behind the NAT device.

The correct answer is *77 / *87. This answer is correct because *77 and *87 are the codes used for enabling and disabling the Anonymous Call Rejection feature on a phone. By dialing *77, the user can activate the feature to reject calls from blocked or anonymous numbers, ensuring their privacy. Dialing *87 will deactivate the feature, allowing all calls to come through regardless of their caller ID status.

A "following ghost" is usually caused by a reflection on the cable system caused by poor return loss at the reflecting device and poor directivity at the tap or device feeding the set. This reflection creates a duplicate image of the original signal, appearing slightly behind the original image on the screen.

Return path interference can be affected by Voice of America, CB, and Amateur Radio.

The correct answer is 1310 & 1550. In broadband telecommunications, the wavelengths of light used are centered at 1310 nm and 1550 nm. These wavelengths are commonly used in fiber optic communication systems due to their low attenuation and compatibility with optical fibers. The 1310 nm wavelength is used for short to medium-distance transmissions, while the 1550 nm wavelength is used for long-distance transmissions.

ACP, which stands for Analog Copying and Piracy, prevents or distorts copies over an analog connection between a source player and a DVD recorder, DVR, PC, or VCR. This means that if ACP is enabled, it will make it difficult or impossible to make unauthorized copies of analog content, thus preventing piracy and unauthorized distribution of copyrighted material.

The correct answer is *52 because in telecommunication systems, the code *52 is commonly used to activate the call hold feature. Call hold allows the user to put the current call on hold while they attend to another call or perform other tasks. Therefore, *52 is the correct answer as it corresponds to the call hold function.

Zero beat refers to a method of reception where an RF current is used with the correct magnitude and phase relation, resulting in a received voltage that is identical to the original wave. This means that there is no difference or deviation between the received signal and the original signal, resulting in a perfect match.

The signal leakage limits refer to the maximum allowed signal strength that can leak from a cable or transmission line. In this case, the correct answer states that the signal leakage limit is 20mV/m at a distance of 3 meters, within the frequency range of 54-216MHz. This means that any signal leakage beyond this limit would be considered excessive and could potentially cause interference or other issues.

CRAN stands for Cloud Radio Access Network. It provides a single common infrastructure in which all services are delivered via IP over a consistent transport and routing architecture. This network architecture allows for efficient and flexible delivery of services, as well as seamless integration of different network technologies. CRAN is commonly used in the telecommunications industry to enhance the performance and scalability of wireless networks.

A design map is a map that shows the locations of electronic equipment, including the headend and any hubs, amplifiers, power supplies, and taps. This map is created during the design phase of a project and is used to plan and visualize the layout of the equipment. It helps in determining the most efficient and effective placement of the equipment. The design map is a valuable tool for technicians and engineers involved in the installation and maintenance of electronic systems.

Commercial demarcation refers to the point where the responsibility for a telecommunications service transfers from the service provider to the customer. It is also known as the Minimum Point of Entry (MPOE), which is the point at which the service enters the customer's premises. This is where the service provider's network terminates and the customer's internal wiring begins. The MPOE is an important demarcation point as it determines the boundary of responsibility for troubleshooting and maintenance between the service provider and the customer.

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The correct answer is CFR Title 47, Part 76. This is because FCC regulations regarding signal leakage are outlined in CFR Title 47, Part 76.

The Modulation Error Ratio (MER) is a measure of the quality of a QAM signal. It represents the ratio of the power of errors in the signal to the average power of the signal. A higher MER indicates a lower error rate and better signal quality. This makes MER the most suitable option among the given choices to describe the ratio of error power to average power in an ideal QAM signal.

The correct answer is *74 because it is the only option that is related to a speed dial feature. The other options, *77, *67, and *84, do not have any known association with speed dial.

QAM stands for Quadrature Amplitude Modulation, which is a modulation technique used in telecommunications to transmit digital signals. It allows 2 channels of information to be transmitted on the same frequency by varying both the amplitude and phase of the carrier signal. This enables more efficient use of the available bandwidth and increases the data transmission capacity. By combining two carriers with different phases and amplitudes, QAM can transmit multiple bits of information simultaneously, effectively doubling the data rate on a single frequency.

A strand map is a type of map that shows streets with poles and pedestal locations and includes the span length or footage between active and passive elements. It is used in the telecommunications industry to plan and design the placement of cables and other infrastructure. The map provides important information about the layout and distance between different components, helping technicians and engineers to efficiently install and maintain the network.

A /30 subnet mask is used to allocate a very small range of IP addresses. In this case, a /30 subnet mask provides 4 IP addresses. Out of these 4 addresses, one is reserved as the network address, one is reserved as the broadcast address, leaving only 2 usable IP addresses for devices on the network. Therefore, the correct answer is 4.

The correct answer is *72 / *73.

These are the codes used for call forwarding on a telephone. *72 is used to activate call forwarding, while *73 is used to deactivate it. This means that when you dial *72 followed by a phone number, all incoming calls will be forwarded to that number. Dialing *73 will then disable call forwarding.

A routable IP refers to an IP address that can be reached and accessed from external networks, such as the internet. It is assigned to a device or network that is connected to the internet and allows communication between different networks. In contrast, a non-routable IP is not directly accessible from the internet and is typically used for internal network purposes. Therefore, a routable IP is the correct answer as it accurately describes an IP address that is visible to the public.

In a drop system, signal levels higher than -30db between 5-42MHz should not be present. This means that any signal with a higher level than -30db in this frequency range can cause interference or disruption in the system. Therefore, it is important to ensure that the signal levels are kept below -30db to maintain the proper functioning of the drop system.

The correct answer is *75 because it is the last number listed in the given speed dial sequence.

The given question is asking for a group of numbers that make the expression *232 / *233 true. In order to find the correct answer, we need to divide the number *232 by a number *233. Therefore, the correct answer is *232 / *233.

Frequency Division Multiplexing is the correct answer because it refers to the ability to carry and individually select different channels on a single cable by their unique frequency. This technique allows multiple signals to be transmitted simultaneously without interference, as each signal is assigned a different frequency band.

The correct answer is *97 because "Directed Call Pickup" is a feature in telephony systems that allows a user to answer a specific ringing phone by dialing a code followed by the extension number of the ringing phone. In this case, *97 is the code that initiates the directed call pickup feature.

A response equalizer is used to correct for any undesired peaks within the passband of an amplifier. It helps to balance the frequency response by attenuating or boosting specific frequencies, ensuring a more accurate and flat response across the entire frequency range. This can be especially useful in audio systems where certain frequencies may be emphasized or attenuated, causing an imbalance in the sound. By using a response equalizer, these peaks can be corrected, resulting in a more balanced and accurate audio output.

The given sequence of numbers represents the steps to perform Directed Call Pick Up without barge in. The code *71 is used in many telephone systems to pick up a call ringing on a specific extension.

Alarm Pin #4 indicates a "Battery Low" problem. This means that the alarm system is detecting that the battery level is below the acceptable threshold. It is important to address this issue promptly to ensure that the battery is replaced or recharged to maintain the proper functioning of the alarm system.

The correct answer is *88. This is because *88 is the code used to retrieve a parked call.

The correct answer is "Battery Missing" because if the alarm pin #3 indicates that the battery is missing, it means that the device or system being monitored does not have a battery installed. This could be a problem because the battery is necessary for the proper functioning of the device or system.

The NPR Ratio measures the Noise Power Ratio in a multi-channel system. It specifically focuses on the unused portion of the system where random activity occurs in the active channels. This ratio helps to evaluate the level of noise present in the system and assess its impact on the overall performance.

The optical receiver is the correct answer because it converts incoming light signals into RF (radio frequency) signals that can be transmitted through coaxial cables. This device is typically used in optical communication systems to receive and decode optical signals sent through optical fibers, allowing for the transmission of data over long distances.

The correct answer is *22 Flash, *55. This sequence of dialing codes is used to direct a call straight to voicemail without the recipient's phone ringing. By dialing *22, the caller activates the call forwarding feature, and by dialing *55 immediately after, they specify the voicemail number. This allows the caller to bypass any potential conversation with the recipient and leave a message directly in their voicemail.

A tree map is a type of map that provides a condensed layout of a system. It is a visual representation that organizes information in a hierarchical structure, similar to a tree. Each branch of the tree represents a different aspect or component of the system, allowing for a clear and organized overview. This type of map is commonly used in various fields, such as computer science, data visualization, and project management, to help understand the relationship and structure of complex systems.

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The given answer "*230 / *231" is correct because it follows the pattern of the previous expressions. Each expression starts with an asterisk followed by a number, and the second part of the expression is obtained by subtracting 1 from the number in the first part. Therefore, in this case, subtracting 1 from 231 gives us 230, and the expression becomes "*230 / *231".

The correct answer is *22 Flash, *33. This is because the Flash Call Hold feature allows the user to put a call on hold and initiate another call. By using *22, the user can put the current call on hold. Then, by using *33, the user can initiate a new call while the previous call is on hold. Therefore, *22 Flash, *33 is the correct sequence of actions to use the Flash Call Hold feature with the ability to barge in on another call.

The correct answer is "Replace Battery" because Alarm Pin #2 indicates that there is a problem with the battery and it needs to be replaced.

The minimum signal of merit required to pass the CLI test is 64.

A temporary IP address is also called a private IP because it is used within a private network and is not accessible or routable from the internet. Private IP addresses are commonly used in home and office networks to assign unique addresses to devices within the network, allowing them to communicate with each other. These addresses are not globally unique and cannot be used to directly access resources on the internet.

The correct answer is *60 / *80. This is because *60 and *80 are the codes used for call screening. By dialing *60, users can block specific phone numbers from calling them, while *80 allows users to turn call screening on or off. Therefore, *60 / *80 is the correct answer as it represents the call screening feature.

The given statement implies that the desired carrier signal level should be at least 60db higher than the level of the ghost signal in order to be able to see the ghost.

The correct answer is *63 / *83. This is because *63 is the code for activating Call Forward Selective, which allows users to forward specific calls to another number. On the other hand, *83 is the code for deactivating Call Forward Selective, which cancels the call forwarding feature. Therefore, *63 and *83 are the appropriate codes for enabling and disabling Call Forward Selective.

The given options are different phone codes. *69 is used to redial the last number that called you, *67 is used to block your caller ID when making a call, and *88 is not a recognized phone code. Therefore, the correct answer is *68, which is likely another phone code that may have a specific function or purpose.

Common Path Distortion refers to the interference caused by multiple signals traveling along the same path. In this case, the 6MHz spikes on the return path indicate that there is distortion present due to multiple signals sharing the same path. This can result in signal degradation and affect the overall quality of the transmission.

The correct answer is *81. Distinctive Ring is a feature that allows users to assign different ring patterns or tones to specific phone numbers. By dialing *81, the user can activate this feature and set a unique ringtone for a particular number. This can be helpful in identifying important calls or filtering out unwanted calls based on the ring pattern.

The correct answer is *70. This code is used to cancel call waiting on a telephone line. When call waiting is activated, it allows the user to receive incoming calls while already on a call. However, by dialing *70, the user can disable call waiting and prevent any incoming calls from interrupting the current call.

The correct answer is *78 / *79. This is because *78 activates the "Do Not Disturb" mode on most mobile phones, which prevents incoming calls and notifications from disturbing the user. On the other hand, *79 deactivates the "Do Not Disturb" mode, allowing calls and notifications to come through as usual. Therefore, *78 and *79 are the correct options for controlling the "Do Not Disturb" feature on a mobile phone.

The correct answer is *98. Call pickup is a feature that allows a user to answer a call that is ringing on another extension within the same phone system. By dialing *98, the user can pick up a call that is ringing on any other extension in the system. The other options (*99, *97, *21) do not represent the call pickup feature and therefore are not the correct answers.

The correct answer is *67 / *82. This answer is correct because *67 is the code used to block caller ID for a specific call, while *82 is the code used to unblock caller ID for a specific call. By using *67, the caller's number will be hidden from the recipient of the call, providing privacy. On the other hand, *82 can be used to reveal the caller's number if it was previously blocked.

The total loss from the tap to the TV and modem can be calculated by adding up the individual losses at each segment of the signal path.

For the TV at 55mhz, the loss is 7.325db from the tap to the TV.
For the TV at 550mhz, the loss is 15.2db from the tap to the TV.
For the modem at 55mhz, the loss is 7.155db from the tap to the modem.
For the modem at 550mhz, the loss is 14.68db from the tap to the modem.

Therefore, the total loss from the tap to the TV and modem is 7.325db + 15.2db + 7.155db + 14.68db = 44.36db.