Shanghai Bell A1000 ADSL broadband access Scheme

A1000 ADSL delivers high-speed video, audio and data signals on existing telephone twisted-pair lines, taking an important step in bringing the information superhighway to the thousands of households.
ADSL technology separates uplink channel from Downlink Channel, uplink channel rate from KBIT/S to 640 kbit/s, downlink channel rate from kbit/s to 8 mbit/s, Particularly suitable for client-server architecture where clients read a large amount of information from a server and relatively infrequently transfer data to the server. A1000 ADSL uses the advanced DMT and the ATM technology, allows the user to keep the original simulation service, through the twisted pair line operation broadband service. For network operators, the use of A1000 ADSL products to give full play to the role of broadband network to eliminate the bottleneck of low speed access, at the same time, the data flow and telephone system traffic flow phase separation, to avoid the data business long occupation of the telephone network caused by congestion, less investment, quick results.
System structure
A1000 ADSL products are made up of local and client-side equipment.

The location of ADSL access devices in the network
Central node: ATM user access multiplexing equipment (ASAM)
The ASAM consists of a network interface (NT), an ATM bus, and several line terminals (LT). On the one hand, the user's data flow into ATM format, transmitted to the transmission system connected to the ATM network, on the other hand, the ATM network to send the letter based on Vpi/vci repeatedly, Asam at the same time complete the OAM function. Transmission system
The A1000 ADSL transmission system adopts advanced DMT and ATM technology, and follows the ANSI T1.413 protocol. Services with different bandwidth and flow characteristics can be effectively combined to transmit at the maximum physical bit rate.
Client: A1000 ADSL network terminal (ANT) and pots separator
Ant devices connect twisted-pair and user terminals on the client side, Ant has two interfaces: ATM Forum interface, Ethernet interface.
The POTS separator uses analog signals from telephones and digital signal multiplexing/Zhei from Ant on the same pair of twisted pairs.
Network management
The ADSL access subsystem is managed by the AWS Network Management workstation. AWS connects the ADSL system from the remote to the ATM network, managing Asam and Ant. Management information is transmitted using ATM signaling.
Application Scheme
VOD on Demand
The downlink rate of the 2-8mbps ensures the bandwidth required for the VOD; The business can be carried out including VOD, travel guide, distance education, company introduction and so on.
High-Speed Internet access
The access rate is higher than the average modem, which greatly improves the efficiency of using the Internet.
Remote Access Enterprise LAN
field Office Branch through the broadband network high-speed access to corporate headquarters network, the use of enterprise network information, without affecting the use of the telephone.