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1. 发明授权

US06850618B1 Central office interface techniques for digital subscriber lines 有权
标题翻译：数字用户线的中心局接口技术
公开(公告)号：US06850618B1
公开(公告)日：2005-02-01
申请号：US09570804
申请日：2000-05-15
申请人： Hessam Mohajeri , Serdar Kiykioglu , Heron Babaei
发明人： Hessam Mohajeri , Serdar Kiykioglu , Heron Babaei
IPC分类号： H04M11/06 , H04M1/00 , H04M9/00
CPC分类号： H04M11/062
摘要： A splitterless interface between a digital subscriber line (DSL) and the central office equipment that can receive and isolate the low frequency voice data and high frequency digital data from a telephone line. This interface can also mix and transmit low frequency voice data and high frequency digital data onto a telephone line. For POTS band frequencies, a reactive impedance coupled across the two-wire interface of the POTS line card, and serially coupled to the line side of the DSL coupling transformer, has an open state magnitude. The magnitude of the line side windings of the DSL coupling transformer is low at POTS band frequencies. POTS band signal power is therefore delivered to the POTS line card. For DSL band frequencies, the reactive impedance across the two-wire interface of the POTS line card has a closed state magnitude. The POTS line card is therefore essentially short-circuited at DSL band frequencies, and DSL band signal power is delivered to the DSL modem. The frequency band in which the reactive impedance transitions from an open state magnitude to a closed state magnitude corresponds to the frequency band between the POTS frequency band and the DSL frequency band.
摘要翻译：数字用户线（DSL）与中心局设备之间的无分离器接口，可以从电话线接收和隔离低频语音数据和高频数字数据。该接口还可以将低频语音数据和高频数字数据混合并传输到电话线上。对于POTS频带频率，耦合在POTS线卡的两线接口上并串联耦合到DSL耦合变压器的线路侧的无功阻抗具有开放状态幅度。 DSL耦合变压器的线路侧绕组的幅度在POTS频带频率较低。因此，POTS频带信号功率被传送到POTS线路卡。对于DSL频段，POTS线卡两线接口之间的无功阻抗具有闭合状态幅度。因此，POTS线卡在DSL频带频率基本上短路，并且DSL频带信号功率被传送到DSL调制解调器。其中无功阻抗从开态状态幅度转变到闭状态幅度的频带对应于POTS频带和DSL频带之间的频带。

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