Internet access

Internet access through specific information acquisition and sharing of transmission channels, use the following transmission technology completing the user and IP wan high bandwidth and high speed of physical connection.

1, telephone dial-up (PSTN)

Common narrowband access method. That is, through telephone lines, the use of local operators access number, dial-up access to the Internet, rate does not exceed 56Kbps. Characteristic is easy to use, only effective telephone lines and cabin MODEM PC can be completed access.

Use in some low rate of network applications (such as web surfing, chatting, EMAIL query etc), mainly suitable for temporary access or no other broadband access sites use. Faults are rate is low, cannot achieve some high speed requirements of the network service, followed by higher cost (access fees by telephone TongXinFei and Internet use composition).

2, ISDN

Known as "the first tong". It USES digital transmission and digital switching technology, telephone, fax, data, image and so on many kinds of operation integrated in a unified digital network for transmission and processing. Users with a ISDN line, can be in Internet users at the same time telephone, fax, just like two telephone line the same. There are two basic rate interface ISDN 64kbps information channel and a signaling pathways, abbreviation 16kbps 2B + D, when people call dial the fashionable, it will automatically release a B channel to telephone. Mainly suitable for ordinary families users. Faults are rate is still low, cannot achieve some high rate of network services; request Secondly is charge also higher (access fees by telephone TongXinFei and Internet use composition).

3, xDSL access

Is mainly an ADSL/ADSL2 + the access method is given priority to, is currently using the most extensive copper access method. ADSL can be directly used to existing telephone lines, through ADSLMODEM after the digital information transmission. Theory can reach the 8Mbps rate of 1Mbps descending and ascending, transmission distance is up to 4 ~ 5 km. ADSL2 + rate can reach 1Mbps 24Mbps descending and ascending. In addition, the latest VDSL2 technology can be 100Mbps downlink each speed. Features are rate stability, bandwidth alone, without interfering with speech data etc. Applicable to family, personal and other users to most of the network applications, satisfy some broadband business including IPTV, VOD video (VOD), distance education, the videophone, multimedia retrieval, the LAN interconnected, Internet access, etc.

4, HFC (CABLEMODEM)

Is a kind of copper resources based on cable TV network access styles. Internet connection with special characteristics, allowing users to through the cable television network to realize high speed access to the Internet. Applicable to have cable television network in the family, individuals or small groups. Features are rate is higher, access convenient (through cable data transmission, do not need wiring), which can realize various video service, high-speed download, etc. Weakness is based on cable TV network architecture is to belong to the network resources sharing type, when the user surge, rate would decline and unstable, expansibility enough.

5, light broadband access

Via fiber-optic access to the village to the node or corridor, again by cable connected to each share point (usually less than 100 meters), provide certain areas of high-speed Internet access. Features are high rate and strong anti-jamming capability, applicable to family, individual or group enterprises of all types, may realize the all kinds of high rate of Internet application (video service, high-speed data transmission, remote sensing, etc.), defect is one-time wiring cost is higher.

6, passive optical network (PON)

PON (passive optical network) technology is a kind of point-to-multipoint fiber optic transmission and access technology, bureau end to client maximum distance for 20 km, total transmission capacity access system for each ascending and descending 155Mbps / 622M / 1Gbps, by all users to share, each user use of bandwidth can with 64kbps stepping division. Characteristic is access high rate and can realize all kinds of high rate of Internet application (video service, high-speed data transmission, remote sensing, etc.), defect is one-time invest more.

7, wireless network

Is a cable access extensions of the technology, use of radio frequency (RF) technology is empty sending and receiving data, reduce use wire connection, so the wireless network system can reach the purpose of construction of computer network system, and also can let equipment arrangements freely and move. In the public open places or enterprise internal, wireless networks will generally as existing cable network, a supplementary way with wireless card computer through wireless means convenient access to the Internet.