What is a Network?
A network originally referred to a state of interconnected links, forming a web-like structure. It means that the entire world can become a network. A "computer network" connects computers, dramatically changing our work and lives. The network takes connectivity between computers a step further, making it a "network of networks." Let's start with the network used in offices or schools: "LAN."
What is LAN?
Computer networks can be divided into LAN and WAN. LAN stands for Local Area Network, which refers to networks that facilitate data or image transmission between computers within a limited area, such as an office, factory, or university campus. WAN, on the other hand, stands for Wide Area Network, using telephone or dedicated lines to connect computers in different geographic locations, such as between a head office and branch offices.
Advantages of Using a Network
- Centralized Data Management
- Computers connected to a network can read, write, and share data on other computers' hard drives, allowing centralized management by a specific computer, which is easy and convenient.
- Effortless Data Exchange
- Data can be exchanged between computers on the network through the LAN, making data integration seamless, especially for transmitting large amounts of multimedia data.
- Simultaneous Use by Multiple Computers
- All computers connected to the network can read and write over the network using a single telephone line. Therefore, there is no need for extra telephone lines or modems.
LAN Connection Methods
LAN connections include Ethernet, FAST Ethernet, and GIGABIT Ethernet. Ethernet can be further classified into 10BASE-T, 10BASE-5, 10BASE-2, etc. The "10" in 10BASE represents the data transmission speed on Ethernet, which is 10 Mbps (meaning 10 Mbit of data can be exchanged in one second). FAST Ethernet represents a transmission rate of 100 Mbps, while GIGABIT Ethernet achieves a rate of 1 Gbps. In a LAN environment, the transmission speed refers to how much data can be transmitted within a fixed time, indicating the "size of the pipe."
Advantages of Constructing a Security System Using a Network
Easy Installation or Relocation
Previously, dedicated cable systems required elaborate drilling into walls for installation. However, with existing network equipment, you can easily complete the wiring using the existing network system without any hassle. For places like department stores or exhibition halls where renovations and camera position changes are frequent, network-based systems make it easy to rewire and adjust.
Remote Control and Monitoring Made Simple
Data exchange between two separated locations is one of the greatest advantages of networks. Through networks or telephone lines, remote monitoring and control can be done on a computer or monitor.
Broadband Speed Comparison
- T1: 1.54 Mbps
- E1: 2 Mbps
- T3: 45 Mbps
- ATM: 25 ~ 622 Mbps
- Cable Modem: 27 ~ 36 Mbps
Note:
Fast Ethernet: 1000 Mbps
FDDI: 100 Mbps
Giga Net: 1000 Mbps
| Broadband Types | Wired Systems | General Telecommunications and Network | ADSL |
| xDSL | |||
| Dedicated Line | |||
| Cable TV Network | Cable Modem | ||
| Wireless Systems | General Wireless Systems | GPRS (General Packet Radio Service) | |
| CDMA | |||
| WCDMA | |||
| Digital Microwave | Digital Microwave Radio | ||
| Satellite Communication | Satellite Broadcast Network | ||
| VSAT |
Wi-Fi Network Planning Advice
15 Tips for Hard Drive Longevity
10 Things About Image Analysis
知識學院
蘊藏許多助人的知識與智慧。