Communication Systems Revision Set 3

During a telephone call over the PSTN, a single connection is maintained for the duration of the call. This means that once the call is established, the connection remains open and dedicated solely to that call until it is terminated. Unlike data packets in IP networks, the voice data in a telephone call is not split into packets that travel independently of each other. Additionally, the question does not provide any information regarding the sharing of circuits with IP and other voice data, so it cannot be determined whether the same circuit may be shared or not.

Teleconferencing systems offer the advantage of significant savings in terms of money and time compared to face-to-face meetings. This is because participants do not need to travel to a specific location, which eliminates the need for transportation costs and reduces the time spent on commuting. Additionally, teleconferencing allows for more efficient scheduling, as participants can join the meeting from their own locations, eliminating the need to coordinate travel arrangements. Overall, this advantage makes teleconferencing a cost-effective and time-saving option for widely dispersed participants.

In PSTN based audio conferences, all participants share a single circuit. This means that the audio from each participant is transmitted over the same circuit, allowing them to communicate with each other. Unlike digital audio conferences where the audio is transferred as packets, in PSTN conferences, the audio is transmitted over a single circuit, which may result in limitations such as lower audio quality or limited capacity for simultaneous participants.

The statement "The quality can never exceed that of the collected video" means that the video quality in a video conference is limited by the quality of the original video that was collected. This implies that even if the participants have high-quality devices or connections, the video quality cannot be better than what was initially captured. This is because the video conference system relies on the collected video as its source, and any limitations or imperfections in that original video will be carried over to the video conference.

When IP multicast is used, each participant in the multicast group receives the same stream of data. This means that a single stream is sent from the source and is replicated by the network to reach all the intended recipients. This allows for efficient distribution of data to multiple recipients without the need for separate streams for each participant. It eliminates the need for a dedicated streaming server and enables video transmission from multiple locations.

The correct answer is "Phone, video camera, document camera, keyboard, mouse." During teleconferences, data can be collected using various devices. A phone is used for audio communication, a video camera is used to capture video footage, a document camera is used to display documents or objects, and a keyboard and mouse are used to input and control data on a computer or other devices.

Teleconferencing refers to a communication method that allows individuals or groups to interact in real-time, regardless of their physical locations. It involves the exchange of information in both directions simultaneously, making it synchronous. Additionally, teleconferencing enables participants to communicate using both audio and video, allowing for a two-way flow of information, which makes it full duplex. Therefore, the correct answer is "synchronous and full duplex."

A private WAN connecting a company's various offices is best described as a PSTN (Public Switched Telephone Network). The PSTN is a global network of interconnected telephone lines and equipment that allows for the transmission of voice and data signals. In this context, the company's offices would be connected through dedicated telephone lines, ensuring a secure and private connection between them.

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A streaming video server adjusts the quality of the video stream sent to each participant based on their transmission speed. This means that participants with slower internet connections will receive a lower quality video stream to prevent buffering or interruptions, while participants with faster connections will receive a higher quality stream for a better viewing experience. This ensures that all participants can watch the video smoothly, regardless of their internet capabilities.