Technologies related to residential broadband access

The following is an online article on technologies related to residential broadband access. Many cities are building broadband MAN networks in order to meet people's high-level demands on work and methods, it provides users with broadband services such as on-demand video, distance education, and home shopping. Because traditional user access methods use copper wires and The SNI interface is not open, they can only support common voice services and low-speed data services.

In order to meet users' needs for broadband services with IP addresses as the mainstream, broadband access construction for residential areas has become the only solution. As a result, Hefei Telecom bureau, in light of the current situation in this city, has piloted some residential areas and conducted tests on different broadband access, and is promoting the project to the whole city.

Residential District broadband access technical solution

Previously, the copper-based broadband access technology mainly includes xDSL and Cable Modem. The optical fiber-based access technology includes active optical access and Passive Optical Network (APON. Cable Modem uses a bus-like structure to connect to the HFCs. Multiple users share 10 Mbps of bandwidth, and there are noise and two-way transformation problems.

At this stage, due to industry restrictions, telecom operators cannot use this access method. APON is the future direction of access technology and the best choice for FTTH. However, it is not suitable to be used because it is not standardized and the cost is too high. Therefore, at present, Hefei Telecom Bureau has adopted two types of Broadband Access Technologies for residential areas: FTTB + LAN optical fiber to the building + LAN) and ADSL.

Residential broadband access to FTTB + LAN

Set up a layer-3 Ethernet switch in the center data center of the residential area and connect the optical fiber to the layer-2 Ethernet switch of each building unit through a m fast Ethernet port, connect to the households in each unit with a cat5e line. In terms of transmission media, this is a method of connecting optical fiber to the building and then to the user through five lines.

It provides users with high-reliability bandwidth assurance, truly achieving Gigabit to small areas, m to floor units and 10 m to home, and with the further increase in bandwidth demand, it can be smoothly upgraded to deliver Mbit/s to the home without re-wiring. On the network structure.

This is an IP-based broadband access method that completely isolates speech and data. All the network node devices are Ethernet switches, so the user end does not need any modulation equipment, you only need to add an Ethernet card to your computer. This access method has great advantages in terms of investment, transmission quality, bandwidth guarantee, and the provision of new services in the future.

However, its disadvantage is that it cannot solve voice problems at the same time, unless it is VoIP. It also needs further exploration and improvement in network security and user management. Currently, the Hefei Telecom bureau uses a VLAN for each user to isolate users. This access method is suitable for new residential areas with a high user level.

Residential broadband access to ADSL

The client device is placed in the user's home and consists of a separator and ADSL Modem. The ATU-C of local equipment is set in various local communication bureaus, which is composed of Splitter, ADSL Modem and access Multi-Channel compound system. It is usually combined in a cabinet and called DSLAM.

The twisted pair wires are switched to the DSLAM splitter through the MDF external module for business separation. The voice service is switched back to the MDF internal module from the splitter's POTS port, and then connected to the Programmable switch. The ATM/STM-1 interface provided by DSLAM is connected to the ADSL Access Router of the Telecom Bureau's broadband Metropolitan Area Network through optical fiber, which provides access and AAA authentication functions.

ADSL is a high-speed residential broadband access based on existing Copper Twisted Pair wires. It can provide upstream bandwidth of up to 640KB/s and downstream bandwidth of up to 8 Mb/s. The maximum transmission distance is 4 ~ 5 kilometers. The advantage of this access method is that it can solve the voice and data services at the same time without re-wiring, and is simple and feasible for user management.

However, its disadvantage is its low activation rate and poor anti-interference ability. Due to its bandwidth asymmetry, it will not be able to support interactive video services in the future, and the investment is expensive, and the client installation is complicated. To address this problem, Hefei Telecom Bureau introduced adsl g. LITE, Which is 32-bit upstream than normal ADSL except for low access rate ~ Kb/s, 64 kB ~ 1.5 MB/s), the biggest difference is that the user end no longer needs an independent audio separator.

Therefore, the Client installation is relatively simple and reduces the cost per line. Compared with common ADSL, G. LITE has a high degree of standardization and better compatibility. The Access Technologies of ADSL and G. LITE mainly aim at broadband access in old residential areas with scattered broadband requirements, and the areas where fiber optics cannot be put in place in a short term. At present, Hefei Telecom Bureau is conducting this broadband access test and is expected to be fully launched to the market by the end of November. The architecture of the ADSL test network is shown in figure 3.

Residential broadband access to other broadband access methods

In addition to the above two access methods, various new residential broadband access methods have emerged recently. Some communication vendors that have previously produced narrowband access networks have recently launched wide and narrow band integrated service access networks to integrate the broadband and narrow band access modules into a single frame.

Narrowband voice services are connected to the PSTN through the V5 interface, and broadband data services are connected to the broadband network through the Ethernet port or ATM port, providing users with various broadband access such as xDSL and LAN. Because the use of access network equipment makes the optical fiber as close as possible to the user, which shortens the transmission distance of Copper Twisted Pair wires, the ADSL provides a high activation rate and bandwidth assurance, the broadband access module can also be added to the original narrowband access network device frame.

In addition, some vendors have launched an ATM-Based Integrated Access Network to provide users with various access methods, such as voice, xDSL, and LAN, and access the narrowband service network through the ATM circuit simulation interface, access the broadband service network through the ATM interface or LAN simulation interface. At present, Hefei Telecom bureau has been actively researching and exploring broadband access in various residential areas, hoping to adopt the most economical and reasonable broadband access methods for different access environments.

Residential broadband access business plan

For residential broadband access, Hefei Telecom Bureau will carry out the following broadband services for residential users: Intelligent Community Service System Intelligent Community will use communication and network technology to provide users with a comprehensive security system, including anti-theft alarms, fire alarms, gas leaks, emergency calls, and visual intercom. High-tech comfortable services, such as "one card" for residential consumption and information network services.

The popularization of the Internet of distance education and the interconnection of multiple schools in the Metropolitan Area Network provide a broad space for the development of distance education. Students can obtain information they are interested in at home and receive guidance from the best schools or teachers, regardless of distance, energy, disability, and other factors.

Apsaravideo for VOD sets up a VOD server in the metropolitan area network or in the broadband access area of the residential area. You can use the MPEG1 or MPEG2 image format to provide a wide range of apsaravideo for VOD services. In addition, users can also enjoy Internet-based broadband applications such as home shopping, online TV, telemedicine, and information retrieval. In the initial stage of business development, in order to facilitate business promotion and increase user interest, pay by monthly subscription (the monthly rental fee is 150 RMB ), users can enjoy all the broadband services that have been carried out, including high-speed Internet access.