As a video conferencing system that depends on the network operation, the network environment plays a decisive role in the effect of the conference. With the continuous expansion of the scope of video conferencing applications, the demand for network environments is increasingly diversified, and different industries have different needs. At present, the mainstream network lines in the market include IP MAN access, ADSL access, and Cable Modem access. What is the difference between these three access methods and how can users choose according to their own needs? The following small series gives you a brief introduction for users to choose reference.
1. IP metropolitan area network access "IP metropolitan area network" is what we commonly call broadband network. It is based on the city's Internet-based IP protocol (Internet Protocol), based on a variety of transmission media, using TCP / IP protocol for communication protocols, through the router network, to achieve the routing and switching of IP data packets transmission.
IP metropolitan area network access methods are generally divided into LAN access (network cable) and FTTX access (optical fiber). LAN access refers to pulling the network cable directly from the node of the metropolitan area network through the switch and hub to the user's home. Its advantage is that the LAN technology is mature, the prices of network cables and intermediate equipment are relatively cheap, and it can achieve a smooth transition of 1M, 10M, and 100M. The LAN access mode is one of the main ways for home broadband network access.
FTTX access means that the fiber is directly pulled into the user's home (FTTH fiber-to-the-home) or computer (FTTD fiber to the desktop). Since the price of the current fiber network product is not yet high enough to reach the universal stage, its unlimited bandwidth capacity is the future. Broadband network development direction. At present, optical fibers are mainly used for the connection between backbone networks and various nodes, and some enterprises with high bandwidth requirements also adopt this access method.
2, ADSL access:
ADSL (Asymmetrical Digital Subscriber Loop) This emerging Internet access method has been hailed by developed countries as Europe and the United States as "an express train on the modern information superhighway." It utilizes the existing pair of copper twisted pairs (ie, ordinary telephone lines) to provide users with asymmetrical transmission rates (bandwidth) for uplink and downlink, for uplink (from user to network) for low-speed transmission, and downlink (from network to users). ) For high speed transmission. Due to its high downlink rate, wide frequency band, and excellent performance, it is deeply loved by many users and becomes a new and faster and more efficient access method following MODEM and ISDN.
The main advantages of ADSL access include: First-line multi-purpose, Internet access can be called at the same time, without affecting each other; Low cost, belonging to the "line" Internet access, the Internet does not need to pay telephone charges, save expenses; Easy to install, can be directly used The user's telephone line does not need to apply for additional lines. It is only necessary to install an ADSL modem and a telephone splitter on the user's side. It can be used on the computer with an Internet card. The application is widely used, home office, remote office, high-speed Internet access, and distance education. Telemedicine, telemedicine, VOD video on demand, video conferencing, and inter-network connectivity are all easy to use.
3. CableModem Access Mode CableModem is a widely used access mode for broadcast and television systems. The access method utilizes an existing cable television (CATV) network and uses a Cable Modem (cable modem) technology to access the network using a cable (coaxial cable) or HFC (Hybrid Fiber/Coax fiber coaxial) network as a transmission channel. The biggest advantage of CableModem access is its high speed and low resource consumption. Its downlink transmission rate can reach 27 to 56 Mbit/s depending on the bandwidth and modulation method, and the uplink transmission rate can reach 10 Mbit/s.
In practical applications, the CableModem only occupies a small portion of the available spectrum of the cable television system, and thus does not affect watching television and using the telephone when surfing the Internet. As long as you do not send or receive data, even if your computer stays on the Internet 24 hours a day, it does not consume any network and system resources. Specifically, an ordinary Modem transmission medium is independent between the user and the switch, that is, the user relocates the communication medium. CableModem is not a simple modem. It is a combination of Modem, tuner, encryption/decryption device, bridge, network interface card, SNMP agent and Ethernet hub. There is no need for dial-up Internet access, no telephone lines, and only a certain frequency band for transmission and demodulation, which is exactly the biggest difference from ordinary dial-up Internet access.
Since the bandwidth of a cable television network is shared by all users, the bandwidth occupied by each user is not determined and it depends on the number of users who share the bandwidth at a certain moment. With the increase in the number of users, the actual bandwidth allocated to each user will be significantly reduced, and may even be lower than the user's exclusive ADSL bandwidth. Moreover, since it is now a shared network, data transmission is based on a broadcast mechanism, and the security of communication is not high enough. At present, the cable television network is mainly laid in the residential area, so its application range is not very extensive.
4. Wireless access technology Wireless access refers to the access of wireless devices to some or all of the switching nodes and user terminals. Currently, wireless access technologies can be classified into two categories: mobile access and fixed access.
Mobile radio access networks include cellular mobile phone networks, wireless paging networks, cordless telephone networks, trunked telephone networks, satellite global mobile communications networks, personal communications networks, etc., and are one of the most active areas in the communications industry today. Among them, mobile access can be divided into high speed and low speed. High-speed mobile access can generally be used in cellular systems, satellite mobile communication systems, trunked systems, etc., while low-speed access systems can use PGN micro-calls, zones and nanocells, such as CDMA's WILLJACS, PHS, etc., as well as mobile GPRS. Wait.
Fixed access is the use of wireless access from the switching node to the fixed user terminal. It is actually a PSTN/ISDN wireless extension. Its goal is to provide users with transparent PSTN/ISDN services. The terminal of a fixed wireless access system contains no or only limited mobility. Access methods include microwave point multiple access, fixed applications for cellular mobile access, wireless subscriber loops, and satellite VSAT networks.
The fixed wireless access system mainly provides narrowband services, which are basically telephone services. At present, there are three main types of fixed wireless access technologies, namely, the MMDS and DBS as well as the local multipoint distribution service (LMDS) that have already been put into use. The first two are well known, and LMDS is just emerging, and it has only recently become a hot emerging broadband wireless access technology. LMDS usually uses high-frequency wireless signals in the frequency band of 20 to 40 GHz. It can send and receive digital signals between the user's front-end equipment and the base station. The upstream/downstream transmission rate can reach several megabits per second. The main advantage of LMDS is that it requires almost no external cable lines and it is installed quickly. flexible. However, in practical applications, this method is not only expensive in terms of equipment, but also has problems such as channel interference, rain attenuation, and line-of-sight transmission.
Conclusion:
When selecting a network access method, users should comprehensively consider the demand for network bandwidth and network quality for their own selected video conferencing products and application environment in order to maximize the use of their own investment.
1. IP metropolitan area network access "IP metropolitan area network" is what we commonly call broadband network. It is based on the city's Internet-based IP protocol (Internet Protocol), based on a variety of transmission media, using TCP / IP protocol for communication protocols, through the router network, to achieve the routing and switching of IP data packets transmission.
IP metropolitan area network access methods are generally divided into LAN access (network cable) and FTTX access (optical fiber). LAN access refers to pulling the network cable directly from the node of the metropolitan area network through the switch and hub to the user's home. Its advantage is that the LAN technology is mature, the prices of network cables and intermediate equipment are relatively cheap, and it can achieve a smooth transition of 1M, 10M, and 100M. The LAN access mode is one of the main ways for home broadband network access.
FTTX access means that the fiber is directly pulled into the user's home (FTTH fiber-to-the-home) or computer (FTTD fiber to the desktop). Since the price of the current fiber network product is not yet high enough to reach the universal stage, its unlimited bandwidth capacity is the future. Broadband network development direction. At present, optical fibers are mainly used for the connection between backbone networks and various nodes, and some enterprises with high bandwidth requirements also adopt this access method.
2, ADSL access:
ADSL (Asymmetrical Digital Subscriber Loop) This emerging Internet access method has been hailed by developed countries as Europe and the United States as "an express train on the modern information superhighway." It utilizes the existing pair of copper twisted pairs (ie, ordinary telephone lines) to provide users with asymmetrical transmission rates (bandwidth) for uplink and downlink, for uplink (from user to network) for low-speed transmission, and downlink (from network to users). ) For high speed transmission. Due to its high downlink rate, wide frequency band, and excellent performance, it is deeply loved by many users and becomes a new and faster and more efficient access method following MODEM and ISDN.
The main advantages of ADSL access include: First-line multi-purpose, Internet access can be called at the same time, without affecting each other; Low cost, belonging to the "line" Internet access, the Internet does not need to pay telephone charges, save expenses; Easy to install, can be directly used The user's telephone line does not need to apply for additional lines. It is only necessary to install an ADSL modem and a telephone splitter on the user's side. It can be used on the computer with an Internet card. The application is widely used, home office, remote office, high-speed Internet access, and distance education. Telemedicine, telemedicine, VOD video on demand, video conferencing, and inter-network connectivity are all easy to use.
3. CableModem Access Mode CableModem is a widely used access mode for broadcast and television systems. The access method utilizes an existing cable television (CATV) network and uses a Cable Modem (cable modem) technology to access the network using a cable (coaxial cable) or HFC (Hybrid Fiber/Coax fiber coaxial) network as a transmission channel. The biggest advantage of CableModem access is its high speed and low resource consumption. Its downlink transmission rate can reach 27 to 56 Mbit/s depending on the bandwidth and modulation method, and the uplink transmission rate can reach 10 Mbit/s.
In practical applications, the CableModem only occupies a small portion of the available spectrum of the cable television system, and thus does not affect watching television and using the telephone when surfing the Internet. As long as you do not send or receive data, even if your computer stays on the Internet 24 hours a day, it does not consume any network and system resources. Specifically, an ordinary Modem transmission medium is independent between the user and the switch, that is, the user relocates the communication medium. CableModem is not a simple modem. It is a combination of Modem, tuner, encryption/decryption device, bridge, network interface card, SNMP agent and Ethernet hub. There is no need for dial-up Internet access, no telephone lines, and only a certain frequency band for transmission and demodulation, which is exactly the biggest difference from ordinary dial-up Internet access.
Since the bandwidth of a cable television network is shared by all users, the bandwidth occupied by each user is not determined and it depends on the number of users who share the bandwidth at a certain moment. With the increase in the number of users, the actual bandwidth allocated to each user will be significantly reduced, and may even be lower than the user's exclusive ADSL bandwidth. Moreover, since it is now a shared network, data transmission is based on a broadcast mechanism, and the security of communication is not high enough. At present, the cable television network is mainly laid in the residential area, so its application range is not very extensive.
4. Wireless access technology Wireless access refers to the access of wireless devices to some or all of the switching nodes and user terminals. Currently, wireless access technologies can be classified into two categories: mobile access and fixed access.
Mobile radio access networks include cellular mobile phone networks, wireless paging networks, cordless telephone networks, trunked telephone networks, satellite global mobile communications networks, personal communications networks, etc., and are one of the most active areas in the communications industry today. Among them, mobile access can be divided into high speed and low speed. High-speed mobile access can generally be used in cellular systems, satellite mobile communication systems, trunked systems, etc., while low-speed access systems can use PGN micro-calls, zones and nanocells, such as CDMA's WILLJACS, PHS, etc., as well as mobile GPRS. Wait.
Fixed access is the use of wireless access from the switching node to the fixed user terminal. It is actually a PSTN/ISDN wireless extension. Its goal is to provide users with transparent PSTN/ISDN services. The terminal of a fixed wireless access system contains no or only limited mobility. Access methods include microwave point multiple access, fixed applications for cellular mobile access, wireless subscriber loops, and satellite VSAT networks.
The fixed wireless access system mainly provides narrowband services, which are basically telephone services. At present, there are three main types of fixed wireless access technologies, namely, the MMDS and DBS as well as the local multipoint distribution service (LMDS) that have already been put into use. The first two are well known, and LMDS is just emerging, and it has only recently become a hot emerging broadband wireless access technology. LMDS usually uses high-frequency wireless signals in the frequency band of 20 to 40 GHz. It can send and receive digital signals between the user's front-end equipment and the base station. The upstream/downstream transmission rate can reach several megabits per second. The main advantage of LMDS is that it requires almost no external cable lines and it is installed quickly. flexible. However, in practical applications, this method is not only expensive in terms of equipment, but also has problems such as channel interference, rain attenuation, and line-of-sight transmission.
Conclusion:
When selecting a network access method, users should comprehensively consider the demand for network bandwidth and network quality for their own selected video conferencing products and application environment in order to maximize the use of their own investment.
Henan Huanghe Whirlwind International Co., Ltd. was a sole subsidiary of Henan Huanghe Whirlwind Co., Ltd., a listed company on Shanghai Stock Exchange in 1998. Huanghe Whirlwind specializes in Industrial Diamond, Diamond Tools, Special Vehicle, Lithium Battery and Industrial Robot . The Specialized Vehicle and Industrial Robot system have received lots of attention from the MCPRC and MIIT and also the products with[China Top Brand" have been sharing high reputation in global market.
In order to expand global market and build the International brand, Henan Huanghe Whirlwind Co., Ltd. set up Henan Huanghe Whirlwind International Co.,Ltd. in CBD Zhengzhou City. The general manager is Ms. Angel Bao, an experienced and professional foreign trade expert. The new company mainly takes charge of international business including foreign trade, international cooperation, merger, acquisition and integration of overseas assets, etc. It will be a milestone for the internationalized strategy of the listed company.
Synchronous Motors,Road Cutter Equipment,Processing Machine,Cold Press Machine Equipment
Henan Huanghe Whirlwind International Co., Ltd. , https://www.huangheindustry.com