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1. 发明授权

US5119402A Method and apparatus for transmission of local area network signals over unshielded twisted pairs 失效
标题翻译：用于传输未经焊接的双绞线的本地区域网络信号的方法和装置
公开(公告)号：US5119402A
公开(公告)日：1992-06-02
申请号：US545310
申请日：1990-06-26
申请人： Simon A. Ginzburg , John M. Rieger
发明人： Simon A. Ginzburg , John M. Rieger
IPC分类号： H04L29/00 , H04L25/49 , H04L25/497
CPC分类号： H04L25/4923
摘要： Apparatus, and a related method for its operation, for transmitting binary data at high speed through unshielded twisted pairs of conductors intended for a much lower data speed and bandwidth. By using a combination of demultiplexing into multiple data channels, encoding the binary signals into a modified three-level duobinary code, and filtering the signals before transmission, data rates as high as 125 megabits per second can be transmitted over four unshielded twisted pairs of conductors. Two illustrative forms of the invention are disclosed, one of which uses two channels for transmission over two twisted pairs in each direction of transmission. The other form of the invention uses four data channels, to further reduce the transmitted bandwidth in each channel, and four twisted pairs of conductors, for transmission in both directions by means of hybrid circuits interconnecting the transmitter and receiver functions at each end of the channels.

2. 发明授权

US5408473A Method and apparatus for transmission of communication signals over two parallel channels 失效
标题翻译：通过两个并行通道传输通信信号的方法和装置
公开(公告)号：US5408473A
公开(公告)日：1995-04-18
申请号：US201704
申请日：1994-02-25
申请人： Jerry Hutchison , Simon A. Ginzburg , William C. Mallard, Jr.
发明人： Jerry Hutchison , Simon A. Ginzburg , William C. Mallard, Jr.
IPC分类号： H03M9/00 , H04L25/14 , H04J3/06
CPC分类号： H03M9/00 , H04L25/14
摘要： A technique for synchronizing run-length-limited data transmitted over two parallel narrowband communication channels, such as in a token ring local area network using fiber distributed data interface (FDDI) protocols. A serial data stream to be transmitted is demultiplexed onto the two channels by sending sequential blocks of equal numbers of bits over alternate channels. In a receiver-multiplexer, block boundary synchronization is established during connection initialization by using a property of a required HALT code to detect block boundaries received in each channel. Skew compensation is effected by comparing the times of detection of the block boundaries in the two channels, and appropriately controlling a variable delay in at least one of the channels. The technique establishes reliable block boundary synchronization and skew error compensation during connection initialization, and if there is subsequent loss of synchronization, detected transmission errors will eventually result in connection reinitialization and reestablishment of synchronization.
摘要翻译：一种用于同步使用光纤分布式数据接口（FDDI）协议在诸如令牌环局部区域网络中的两个并行窄带通信信道上传送的游程限制数据的技术。要发送的串行数据流通过在交替信道上发送相等数量的比特的顺序块来解复用到两个信道上。在接收机多路复用器中，通过使用所需HALT码的属性来检测在每个通道中接收的块边界，在连接初始化期间建立块边界同步。通过比较两个通道中的块边界的检测次数，并适当地控制至少一个通道中的可变延迟来实现偏移补偿。该技术在连接初始化期间建立可靠的块边界同步和偏移误差补偿，如果随后的同步丢失，检测到的传输错误将最终导致连接重新初始化和重新建立同步。

3. 发明授权

US5412691A Method and apparatus for equalization for transmission over a band-limited channel 失效
标题翻译：通过频带限制信道进行均衡的方法和装置
公开(公告)号：US5412691A
公开(公告)日：1995-05-02
申请号：US260499
申请日：1994-06-15
申请人： Simon A. Ginzburg , Roy W. Gustafson , David S. Newman
发明人： Simon A. Ginzburg , Roy W. Gustafson , David S. Newman
IPC分类号： H04L25/03 , H04L25/49
CPC分类号： H04L25/03834
摘要： A technique for compensating for frequency distortion in a band-limited communication channel, using a random-access memory (RAM) to store successive samples of a signal pulse, the samples having been precalculated to perform an equalization function prior to transmission of the pulse. The signal samples are retrieved, converted to analog form, and filtered to produce a precompensated analog pulse signal. In one embodiment of the invention, equalized profiles of a limited number of pulses of different shapes are stored in the RAM, and are retrieved as needed for transmittal through the band-limited channel. Thus the invention can perform its equalization function while facilitating encoding of the signal into a different form, such as modified duobinary code.
摘要翻译：一种用于补偿频带限制通信信道中的频率失真的技术，其使用随机存取存储器（RAM）来存储信号脉冲的连续样本，所述样本已被预先计算以在发送脉冲之前执行均衡功能。信号样本被检索，转换成模拟形式，并被滤波以产生预补偿的模拟脉冲信号。在本发明的一个实施例中，将不同形状的有限数量的脉冲的均衡曲线存储在RAM中，并且根据需要被检索以通过带限通道传输。因此，本发明可以执行其均衡功能，同时促进将信号编码成不同的形式，例如修改的二进制代码。

4. 发明授权

US5408500A Method and apparatus for transmission of local area network signals over a single unshielded twisted pair 失效
标题翻译：用于通过单个非屏蔽双绞线传输局域网信号的方法和装置
公开(公告)号：US5408500A
公开(公告)日：1995-04-18
申请号：US18628
申请日：1993-02-17
申请人： Simon A. Ginzburg , John Fitzgerald
发明人： Simon A. Ginzburg , John Fitzgerald
IPC分类号： H04L25/08 , H04L25/34 , H04L25/497 , H04K1/02 , H04L25/49
CPC分类号： H04L25/497 , H04L25/085
摘要： A binary signal encoding technique for reducing the amount of electromagnetic interference (EMI) caused by the transmission of high-speed binary signals over an unshielded twisted pair of conductors. Duobinary modulation, combined with low-pass filtering to confine the signals' frequency spectrum, and stop-band filtering to reduce critically high spectral lines, results in an acceptably low level of electromagnetic emission from the twisted pair. Moreover, duobinary modulation and stop-band filtering to reduce spectral lines avoids the need for signal scrambling to reach acceptable radiation levels by spreading the signal energy across the frequency spectrum.
摘要翻译：一种二进制信号编码技术，用于减少由非屏蔽双绞线导体传输高速二进制信号引起的电磁干扰量（EMI）。双二进制调制，结合低通滤波来限制信号的频谱和阻带滤波以减少严重的高频谱线，从双绞线导致可接受的较低水平的电磁辐射。此外，用于减少频谱线的双二进制调制和阻带滤波避免了通过在整个频谱上扩展信号能量而使信号加扰达到可接受的辐射水平的需要。

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