ADSL technology with CABLEMODEM comparison and analysis-CableModem, Ethernet, ca
Based phone line ADSL Technology-based cable Cable The Cable Modem technology is the most promising broadband network technology.
ADSL has asymmetric characteristics of the upper and lower line rate, so its application is mainly used to provide users with access Service And VOD On-demand and other services, does not apply to LAN interconnection services. Provide Internet access services using "ADSL + ATM / Ethernet" approach. ADSL client remote device configuration, the Council configure DSLAM (ADSL central office equipment), between them, with ordinary telephone twisted pair connections. ADSL remote device for the user PC Machine interface, providing Ethernet, DSLAM through ATM or Fast Ethernet is connected with the ISP. Through the network, users can achieve broadband Internet access. ISP DSLAM can be placed in the room, through the access network access to ISP; also be directly placed in the ISP engine room, and the ISP directly connected to the LAN access platform use. Used to provide ADSL Video on Demand VOD Business, you can use "ADSL + ATM" approach.
CableModem asymmetric downlink and uplink bandwidth is also a technology for providing both Internet access and VOD service. Which can be used to provide Internet access service "HFC + CableModem + Ethernet / ATM" approach. Central Office needs with a HFC Headend Equipment, by ATM or Fast Ethernet and Internet connectivity, and complete signal modulation and mixing functions. Data signals through the HFC network (HFC) transmitted to the user at home, CableModem complete signal decoding, demodulation and other functions, and digital signal through the Ethernet port to send to the PC. Conversely, CableModem PC, came to receive the uplink signal, encoded, modulated pass through HFC head-end equipment.
ADSL and CableModem two techniques can provide a variety of business networking, and can basically meet the needs of current broadband services. ADSL bandwidth is lower than in CableModem, however, carried out using CableModem and HFC network in the stability, reliability, power supply and the operation and maintenance systems are still some problems. In addition, because of its network line bandwidth is shared, in fact, after the user reaches a certain size can not provide broadband data services, users share the bandwidth is limited. The following is the author's comparison of these two technologies.
? Security Sex. As CableModem signals of all users were carried out with a coaxial cable transmission, so there is the risk of wiretapping. Problem solving wiretapping to protect the cable first, followed by the lines to understand the process of establishing a good set initialization parameters, the latter point is technically difficult to resolve. The ADSL not have this problem.
? Reliability. Because CATV is a tree network, so very easy to create a single point of failure, such as cable damage Amplifiers Failure, transmitter failure will cause the node's customer service interruption. The ADSL uses a star network, a failure of ADSL equipment will only affect one user.
? Stability. CableModem the early users will be able to enjoy a very high quality service, this is because the small number of users under bandwidth and band lines are very abundant. However, users join each CableModem will increase noise, occupied channel, reduce the impact of circuit reliability and quality of service on the existing users. This will be CableModem urgent need to address a major problem. ADSL access network will not be affected by the number of users and traffic impact. Of course, if the DSLAM bandwidth of less than all of the export total bandwidth users may need, there will be congestion at peak times, but this time as long as the bandwidth by increasing exports can solve this problem.
? Compatibility. Although CableModem have been introduced with the ADSL technical norms and standards, but there are different manufacturers of the products can not be compatible to the market expanding so bring some difficulties.
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