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1. 发明授权

US5408507A Extended range enhanced skew controller 失效
标题翻译：扩展范围增强偏移控制器
公开(公告)号：US5408507A
公开(公告)日：1995-04-18
申请号：US53994
申请日：1993-04-27
申请人： Robert P. McNamara , Amar C. Amar , Prabhakara C. Balla , Hung C. Pon , Chuan-Lung Chao , Chongzhen Wang
发明人： Robert P. McNamara , Amar C. Amar , Prabhakara C. Balla , Hung C. Pon , Chuan-Lung Chao , Chongzhen Wang
IPC分类号： H04J3/06 , H04L12/28 , H04L7/00 , H04L25/36 , H04L25/40
CPC分类号： H04J3/0682 , H04L12/28
摘要： An apparatus and method for extending the range of a digital data network by enhancing skew control. The apparatus is a circuit for use in a network interface unit. The apparatus measures the distance of the network interface unit from the head-end retransmission unit of the network by transmitting a series of signal packets on the network and counting the time it takes for the packets to be received back at the interface unit. All transmissions on the network take place with reference to a timing mark transmitted by the head-end unit at a regular interval. The apparatus sends the first in the series of signal packets at a pre-determined pre-skew interval before the timing mark. The apparatus counts the number of clock cycles after the timing mark before the signal packet is received back at the network interface unit. If the signal packet is not received back at the network unit within a pre-determined number of clock cycles, the apparatus sends a new signal packet at a new, larger pre-skew interval before the timing mark and again counts the clock cycles after the timing mark. This process is repeated until a signal packet is successfully received back at the network interface unit. Once a signal packet is successfully received back at the network interface unit, the pre-skew value at which the packet was sent and the value of the number of clock cycles after the timing mark at which the packet was received back is stored in the interface unit and all subsequent transmissions by that unit on the network are done at an interval before the timing mark defined by the stored skew value.
摘要翻译：一种通过增强偏移控制来扩展数字数据网络的范围的装置和方法。该装置是用于网络接口单元的电路。该装置通过在网络上发送一系列信号分组来测量网络接口单元与网络的头端重传单元的距离，并对在接口单元处接收到的分组所花费的时间进行计数。网络上的所有传输参照由头端单元以规则间隔发送的定时标记进行。该装置在定时标记之前以预定的预偏移间隔发送在一系列信号分组中的第一个。该装置在网络接口单元接收信号分组之前对定时标记之后的时钟周期数进行计数。如果在预定数量的时钟周期内没有在网络单元处接收到信号分组，则装置在定时标记之前以新的更大的预偏移间隔发送新的信号分组，并且再次计数在时间周期之后的时钟周期时间标记重复该过程，直到在网络接口单元成功接收到信号分组。一旦在网络接口单元成功地接收到信号分组，则发送分组的预偏斜值和接收到分组的定时标记之后的时钟周期数的值被存储在接口中该单元在网络上的单元和所有后续传输在由所存储的偏斜值定义的定时标记之前的间隔完成。

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