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1. 发明授权

US07430212B2 System and method for improved data transmission speed by fixing the lower corner frequency at a frequency above voice band in a symmetric DSL transmission system 有权
标题翻译：通过在对称DSL传输系统中固定频率高于语音频带的较低转角频率来提高数据传输速度的系统和方法
公开(公告)号：US07430212B2
公开(公告)日：2008-09-30
申请号：US10073098
申请日：2002-02-12
申请人： Patrick H. Stanley , David E. Walford , Clinton F. Earnest , Robert Keith Fahler , Richard T. Causey
发明人： Patrick H. Stanley , David E. Walford , Clinton F. Earnest , Robert Keith Fahler , Richard T. Causey
IPC分类号： H04L12/423
CPC分类号： H04M11/062 , H04L5/023 , H04L5/143 , H04L27/2601
摘要： A system and method of the present invention improves data transmission speeds by fixing the lower corner frequency at a frequency above voice band in a symmetric DSL transmission system. By using a fixed lower corner frequency that is above the voiceband and increasing the upper corner frequency upward as the symbol rate increases, the communication equipment systems utilize symmetric frequency plans that incorporate the relatively low loss, low crosstalk spectrum range while still being able to operate on the same line as analog voice band. Another aspect of the present invention is directed to multiplexing a first modem for communicating information packets between the first modem and a plurality of second modems via a single two-wire (e.g. telephone subscriber) lines. The present invention provides a Multi-Access (MA) protocol that enables a single link to be utilized by more than one access device (e.g., a CPE Modem). The Multi-Access protocol of the present invention provides a means to connect to multiple endpoints on a single local loop. Each CPE Modem may communicate directly with a modem at a CO location thereby removing the need for expensive gateway devices and secondary in-building cabling to support multiple access points.
摘要翻译：本发明的系统和方法通过在对称的DSL传输系统中将低频频率固定在语音频带之上的频率来提高数据传输速度。通过使用高于语音频带的固定下角频率并随着符号速率的增加向上增加上角频率，通信设备系统利用对称频率计划，其包含相对较低的丢失，低串扰频谱范围，同时仍然能够操作与模拟语音频段相同。本发明的另一方面涉及复用第一调制解调器，用于经由单个双线（例如电话用户）线路在第一调制解调器和多个第二调制解调器之间传送信息分组。本发明提供了使多个接入设备（例如，CPE调制解调器）能够使用单个链路的多接入（MA）协议。本发明的多址协议提供了连接到单个本地环路上的多个端点的手段。每个CPE调制解调器可以直接与CO位置的调制解调器通信，从而消除对昂贵的网关设备和辅助建筑物布线的需要，以支持多个接入点。

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