Single-Ended Loop Testing (SELT) – New Architecture
(0) Nowadays the embedded copper plant is revitalized for digital subscriber lines (DSL), and identification of the loop make-up is vital for determining what types of DSLs may be deployed and what bit rates they may transmit. Single ended loop testing (SELT) is new emerged loop test and qualification technology. Its essential for achieving low-cost deployment of DSL, since it allows loops to be qualified in bulk and does not involve any human intervention at the customers location. Though there are several approaches and tools can realize SELT, most of them cant incorporate with DSL chipsets. This paper proposes a novel technique, which can be easily incorporate with the DSL chipsets and accurately qualify a telephone lines. This measurement technique is accord with the G.selt func-tional model which is proposed by ITU. The measurement technique consists of energizing the line with a spread spectrum signal through the line that is reflected back at the discontinuity. Use correlation length measuring principle by calculate the correlation between the reflected signal and the original trans-mitted signal it is easy to get the knowledge of the loop make-up. Then in addition using a direct measurement of the PSD it can pre-qualify the loop.
SELT DSL Spread Spectrum loop qualification system identification
Liu Rongpeng Zhang Fengdeng He Daogang
College of Optical & Electronic Information Engineering,University of Shanghai for Science and Techn Shanghai Sunstar Telecom Technology CO.,LTD,Shanghai,China
国际会议
西安
英文
2007-08-16（万方平台首次上网日期，不代表论文的发表时间）