发明名称 |
ADSL modem apparatus and communication method thereof |
摘要 |
A processor of a transceiver estimates a communication distance to an opposing ADSL modem apparatus by detecting a reception level of a communication distance detecting signal in accordance during an initialization sequence with the ITU-T regulated G.992. 1 or G. 992.2. The communication distance detecting signal is used to detect a communication distance to an opposing ADSL modem apparatus and has comb-shaped frequency characteristics. Based on the estimated communication distance, and by referring to a table showing attenuation of signal energy (stored in a RAM), the signal energy in a high frequency band (among the signal energy assigned to transmitting signals) is concentrated into a low frequency band during the communication.
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申请公布号 |
US2005025227(A1) |
申请公布日期 |
2005.02.03 |
申请号 |
US20040772309 |
申请日期 |
2004.02.06 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
NOMA NOBUHIKO;TAKAGI GENZO;NAGAI MOTOYOSHI;ARAKI MITSUHIRO |
分类号 |
H04J11/00;H04B1/38;H04L5/16;H04L12/20;H04M3/00;H04M11/00;H04M11/06;(IPC1-7):H04B1/38 |
主分类号 |
H04J11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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