Automatic tuning of ADSL circuits

The number of ADSL users in Japan has been rapidly increasing, as ADSL can offer high-speed Internet access for a relatively cheap price. ADSL requires a link to be established between the ATU-C (ADSL terminating unit - center) and ATU-R (ADSL terminating unit - remote) before communications can begin, and its links often go down in noisy circumstances affected by the power of home appliances AM radio transmission and so on. Users tend to complain about the quality of ADSL service to the provider by phone, and having to deal with a large number of calls naturally affects business operations. This paper introduces an ADSL integrated management system (DSL-IMS) that can automatically tune the ADSL circuit according to each user´s environment and stabilize the circuit while maintaining a high data rate. According to the operational result in the real field, DSL-IMS could stabilize the average 97% of the new registration circuits automatically and it could also reduce approximately 45% of operational cost per a circuit. The paper also describes our approach of using DSL-IMS with which we provide ADSL service to more than 1.7 million subscribers.