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公开(公告)号：US07532673B2
公开(公告)日：2009-05-12
申请号：US10768355
申请日：2004-01-30
IPC分类号： H04L27/36
CPC分类号： H04L27/36
摘要： A broadband communications system uses modulation symbol transport over communications links to replace baseband or bandpass signal transport, thereby providing longer communication distances, lower communication link bandwidth, and greater signal quality. Subsequent to transporting the modulation symbols, the symbols are modulated and further transmitted over the RF transmission network.
摘要翻译： 宽带通信系统通过通信链路使用调制符号传输来代替基带或带通信号传输，从而提供较长的通信距离，较低的通信链路带宽和更大的信号质量。 在传送调制符号之后，对符号进行调制并进一步通过RF传输网络进行传输。
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公开(公告)号：US5854840A
公开(公告)日：1998-12-29
申请号：US859262
申请日：1997-05-20
IPC分类号： H04L7/04 , H04L12/56 , H04L25/45 , H04L27/06 , H04L29/06 , H04L29/08 , H04N7/167 , H04N7/52 , H04N7/66 , H04N21/2381 , H04N21/2383 , H04N21/242 , H04N21/43 , H04N21/4363 , H04N21/438 , H04L9/00
CPC分类号： H04L65/607 , H04L12/56 , H04L25/45 , H04L27/06 , H04L29/06 , H04L65/608 , H04N21/2381 , H04N21/2383 , H04N21/242 , H04N21/4305 , H04N21/4363 , H04N21/4381 , H04N21/4382 , H04N7/1675 , H04N7/52 , H04L2007/045 , H04L29/06027 , H04L69/323 , H04L69/324 , H04L7/046 , H04L7/048
摘要： A data communications protocol for single path media having low data error rate requires the generation of a data packet with a start code field having a predetermined pattern, a byte count field for defining a data field having a maximum predetermined length in bytes, a data payload field having a byte count according to the value of the byte count field and a cyclic redundancy check field of predetermined length. The value of the byte count field may be fixed, may be changed from packet to packet or may be changed upon initialization. The described data communications protocol permits utilization with data types varying from high definition television to alarm reporting applications. Moreover, the data rate may be varied by varying an idle time signal duration up to a maximum (when the idle time signal duration is reduced to zero). According to one exemplary embodiment for plastic fiber optic media, MPEG2 transport stream packets may be transmitted at 54 MBaud over distances of 20 meters or even more with other media.
摘要翻译： 具有低数据错误率的单路介质的数据通信协议需要产生具有预定模式的起始码字段的数据分组，用于定义具有最大预定长度（以字节为单位）的数据字段的字节计数字段，数据有效载荷 字段具有根据字节计数字段的值的字节计数和预定长度的循环冗余校验字段。 字节计数字段的值可以是固定的，可以从分组改变到分组，或者可以在初始化时被改变。 所描述的数据通信协议允许利用从高清晰度电视到报警报告应用的数据类型。 此外，可以通过将空闲时间信号持续时间改变到最大值（当空闲时间信号持续时间减少到零时）来改变数据速率。 根据用于塑料光纤介质的一个示例性实施例，MPEG2传输流分组可以在距离为20米或甚至更远的其他介质上以54MBaud传输。
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公开(公告)号：US5668810A
公开(公告)日：1997-09-16
申请号：US429160
申请日：1995-04-26
IPC分类号： H04L7/04 , H04L12/56 , H04L25/45 , H04L27/06 , H04L29/06 , H04L29/08 , H04N7/167 , H04N7/52 , H04N7/66 , H04N21/2381 , H04N21/2383 , H04N21/242 , H04N21/43 , H04N21/4363 , H04N21/438
CPC分类号： H04L65/607 , H04L12/56 , H04L25/45 , H04L27/06 , H04L29/06 , H04L65/608 , H04N21/2381 , H04N21/2383 , H04N21/242 , H04N21/4305 , H04N21/4363 , H04N21/4381 , H04N21/4382 , H04N7/1675 , H04N7/52 , H04L2007/045 , H04L29/06027 , H04L69/323 , H04L69/324 , H04L7/046 , H04L7/048
摘要： A data communications protocol for single path media having low data error rate requires the generation of a data packet with a start code field having a predetermined pattern, a byte count field for defining a data field having a maximum predetermined length in bytes, a data payload field having a byte count according to the value of the byte count field and a cyclic redundancy cheek field of predetermined length. The value of the byte count field may be fixed, may be changed from packet to packet or may be changed upon initialization. The described data communications protocol permits utilization with data types varying from high definition television to alarm reporting applications. Moreover, the data rate may be varied by varying an idle time signal duration up to a maximum (when the idle time signal duration is reduced to zero). According to one exemplary embodiment for plastic fiber optic media, MPEG2 transport stream packets may be transmitted at 54 MB and over distances of 20 meters or even more with other media.
摘要翻译： 具有低数据错误率的单路介质的数据通信协议需要产生具有预定模式的起始码字段的数据分组，用于定义具有最大预定长度（以字节为单位）的数据字段的字节计数字段，数据有效载荷 字段具有根据字节计数字段的值的字节计数和预定长度的循环冗余面板字段。 字节计数字段的值可以是固定的，可以从分组改变到分组，或者可以在初始化时被改变。 所描述的数据通信协议允许利用从高清晰度电视到报警报告应用的数据类型。 此外，可以通过将空闲时间信号持续时间改变到最大值（当空闲时间信号持续时间减少到零时）来改变数据速率。 根据用于塑料光纤介质的一个示例性实施例，MPEG2传输流分组可以在其他介质上以54Mb和甚至更远的距离传输。
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