Analog vs. Digital Signals and Internet Connection Types
Analog vs. Digital Signals
What is the difference between analog and digital? In analog signals (e.g., in the transmission of conventional radio or television), the electrical signal that is transmitted through magnetic waves bears a striking resemblance to the sound or image that resulted, hence the name “analog,” which comes from “analogue.” Digital signals, however, bear no resemblance to the stimulus that created them and consist of a combination of ones and zeros (digits). The main advantage of digital signals over analog is that they are much less sensitive to noise and interference, allowing greater transmission quality.
Frequency is the time to complete a cycle.
Occupational Risk Prevention and Data Protection
- Occupational Risk Prevention Law: This law establishes obligations for employers and rights for workers. Its goals are to combat claims, promote the fulfillment of obligations, include prevention in the management of the company, and improve enforcement.
- Data Protection: To ensure compliance with data protection, it is necessary to monitor its implementation, particularly with regard to the security of information, access, rectification, opposition, and cancellation of data.
Internet Connection Technologies
Modem
A modem is a device used to modulate and demodulate a signal called the carrier by another input signal called the modulating signal (in amplitude, frequency, phase, or another system). Many switched-network modems have automatic dialing and answering capabilities, enabling them to connect when receiving a call from the PSTN. Thanks to these functions, they can automatically perform all operations to establish communication.
RTC (Switched Telephone Network)
RTC connections involve many problems for speed. Modems already reach more than 56 kbit/s. Being a very slow type of connection, it makes file downloads and access to large pages with multimedia content (images, sound, Flash, etc.) extremely difficult.
ISDN (Integrated Services Digital Network)
ISDN is a network that evolved from the Integrated Digital Network (IDN). It provides end-to-end digital connections for a wide range of services, both voice and other types, and users access it through a set of standardized interfaces. We can say that ISDN is a network that evolved from the existing telephone network. By offering digital connections from end to end, it allows the integration of multiple services into a single access point, regardless of the nature of the information to be transmitted and the terminal equipment generating it.
GPRS (General Packet Radio Service)
GPRS technology is a digital mobile telephone network using existing GSM that achieves higher data transfer speeds, especially suitable for connecting to the internet.
ADSL (Asymmetric Digital Subscriber Line)
ADSL stands for Asymmetric Digital Subscriber Line. ADSL is a type of DSL line. It consists of a digital data transmission (the transmission is analog) using the symmetric pair of the copper telephone line that carries the conventional subscriber line, as long as the distance does not exceed 5.5 km from the telephone exchange, and there are no other services on the same wire that may interfere.
3G (Third Generation Mobile Telecommunications)
3G services associated with the third generation provide the ability to transfer both voice data (a telephone call) and non-voice data (such as downloading programs, exchanging emails, and instant messaging).