Voice and Data Transmission Technologies Flashcards

What is the purpose of a modem in data transmission?

Answer: Converts digital data for analog transmission

A modem (modulator-demodulator) is a device that converts digital signals from a computer into analog signals suitable for transmission over analog communication lines, such as telephone lines or cable. Conversely, it also converts incoming analog signals back into digital data for the computer. This modulation and demodulation process enables digital devices to communicate over analog infrastructure.

Which technology is used for high-speed internet over phone lines?

Answer: DSL

DSL (Digital Subscriber Line) is a technology used to provide high-speed internet access over conventional telephone lines. It utilizes the unused frequencies on standard copper telephone wires to transmit data without interfering with voice calls. DSL offers a dedicated connection, providing faster speeds than traditional dial-up internet.

What does VoIP stand for?

Answer: Voice over Internet Protocol

VoIP stands for Voice over Internet Protocol, which is a technology that allows you to make voice calls using a broadband internet connection instead of a traditional phone line. It converts analog audio signals into digital packets and sends them over the internet. This enables cost-effective communication, often integrating voice, video, and messaging services.

Which medium offers the highest transmission speed?

Answer: Fiber optic cable

Fiber optic cables transmit data as pulses of light, offering significantly higher bandwidth and transmission speeds compared to copper-based cables like coaxial or twisted pair. This makes them the fastest medium for data transfer over long distances. Their immunity to electromagnetic interference also contributes to their superior performance and reliability.

What does a router primarily do in a network?

Answer: Routes data between networks

A router's primary function is to direct data packets between different computer networks. It examines the destination IP address of incoming data packets and uses routing tables to determine the most efficient path to forward them to their next hop or final destination. This enables communication between devices on separate networks, including connecting local networks to the internet.

Which protocol is primarily used for sending emails?

Answer: SMTP

SMTP (Simple Mail Transfer Protocol) is the standard protocol used for sending and receiving email messages between email servers. When you send an email, your email client typically uses SMTP to send the message to your outgoing mail server, which then uses SMTP to relay it to the recipient's mail server. It is fundamental for email communication across the internet.

What technology enables mobile phones to connect to the internet wirelessly?

Answer: Cellular network technologies

Mobile phones connect to the internet wirelessly primarily through cellular network technologies such as 3G, 4G LTE, and 5G. These technologies use radio waves to transmit data between the mobile device and cell towers, which are connected to the broader internet infrastructure. This allows users to access the internet from almost anywhere within the network's coverage area.

What type of transmission uses packets?

Answer: Packet-switched transmission

Packet-switched transmission is a method of grouping data into small units called packets, which are then transmitted independently over a network. Each packet contains a portion of the data along with addressing information, allowing them to travel along different routes and be reassembled at the destination. This method is highly efficient and resilient, forming the basis of the internet.

Which wireless technology is commonly used for local area networking?

Answer: Wi-Fi

Wi-Fi (Wireless Fidelity) is a popular wireless technology that allows devices like computers, smartphones, and tablets to connect to a local area network (LAN) and the internet without physical cables. It uses radio waves to create a wireless network, providing convenient and flexible connectivity within a limited range. Wi-Fi is based on the IEEE 802.11 standards.