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1. 发明授权

US4876682A Switching tdm digital signals 失效
标题翻译：切换tdm数字信号
公开(公告)号：US4876682A
公开(公告)日：1989-10-24
申请号：US862730
申请日：1986-05-13
申请人： Alan F. Graves , Paul A. Littlewood , Johannes S. Weiss
发明人： Alan F. Graves , Paul A. Littlewood , Johannes S. Weiss
IPC分类号： H04J3/08 , H04J3/16 , H04Q11/08
CPC分类号： H04Q11/08 , H04J3/08 , H04J3/1611
摘要： Digital signals are multiplexed in tdm (time division multiplex) frames each consisting of an integral number of sub-frames each consisting of an integral number of sub-sub-frames, whereby the tdm frame, sub-frame, and sub-sub-frame periods are harmonically related. The signals are switched in a hierarchy of time switches which are operated sequentially and cyclically with frame periods corresponding to respective ones of these harmonically related periods, whereby the switches switch services at respective harmonically related bandwidths. The harmonic tdm frame structure and the hierarchical switch arrangement combine to facilitate the switching of many services with various bandwidths using relatively small switches.
摘要翻译：数字信号在tdm（时分复用）帧中被复用，每帧由整数个子帧组成，每个子帧由整数个子子帧组成，由此tdm帧，子帧和子子帧时期是和谐相关的。这些信号按照与这些谐波相关周期中的相应周期对应的帧周期顺序地和周期性地操作的时间开关的层级切换，由此交换机以相应的谐波相关带宽切换业务。谐波tdm帧结构和分层交换机布置结合起来，以便利用相对较小的交换机来切换具有各种带宽的许多业务。

2. 发明授权

US4764921A Method of multiplexing digital signals 失效
标题翻译：数字信号复用方法
公开(公告)号：US4764921A
公开(公告)日：1988-08-16
申请号：US797264
申请日：1985-11-12
申请人： Alan F. Graves , Paul A. Littlewood , Johannes S. Weiss
发明人： Alan F. Graves , Paul A. Littlewood , Johannes S. Weiss
IPC分类号： H04J3/00 , H04J3/06 , H04J3/08 , H04J3/12 , H04J3/16 , H04Q11/04 , H04Q11/08
CPC分类号： H04Q11/08 , H04J3/0602 , H04J3/08 , H04J3/12 , H04J3/1611
摘要： A multiplexed bit stream consists of interleaved words all of the same number of bits, the words corresponding to respective channels one of which is a synchronizing channel. A predetermined one of the bits of the words is used to identify the synchronizing channel, and may be used in the other, information, channels to carry service-related overhead and signalling information. The bit rate of the multiplexed bit stream is a harmonic of the bit rate of the individual channels. Such but streams can be further multiplexed together in a word-interleaved harmonic manner, whereby a harmonic structure of signals at different levels of multiplexing is built up.
摘要翻译：复用的位流由相同位数的交织字组成，这些字对应于各自的信道，其中一个是同步信道。字的预定的一个比特用于识别同步信道，并且可以在另一个信息中使用信道来承载业务相关开销和信令信息。复用位流的比特率是各个信道的比特率的谐波。这样的流可以以字交错谐波方式进一步多路复用，由此建立了不同复用级别的信号的谐波结构。

3. 发明授权

US4622666A Circuits for detecting framing bits in a t.d.m. bit stream 失效
标题翻译：用于检测t.d.m.中的成帧位的电路位流
公开(公告)号：US4622666A
公开(公告)日：1986-11-11
申请号：US680436
申请日：1984-12-10
申请人： Alan F. Graves , Paul A. Littlewood , Johannes S. Weiss
发明人： Alan F. Graves , Paul A. Littlewood , Johannes S. Weiss
IPC分类号： H04J3/06
CPC分类号： H04J3/0617
摘要： A framing circuit is disclosed for detecting framing bits in a t.d.m. bit stream having an extended DS1 framing format. The circuit comprises a RAM for storing in respect of each of the 772 time channels the five most recent information bits of the time channel and three other, candidate, bits which represent the likelihood that the particular time channel carries the framing bit pattern. The current and five stored information bits of each time channel are checked to detect the six-bit framing bit pattern. The candidate bits have their value increased or decreased, within predetermined limits, in dependence upon whether or not a phase of the framing bit pattern is detected, and the updated information and candidate bits are stored in the RAM. The modification of the candidate bits in this manner is effected in only every third 772-bit frame. A framing signal is produced in dependence upon the candidate bits.
摘要翻译：公开了一种用于检测t.d.m中的成帧位的成帧电路。具有扩展的DS1成帧格式的比特流。该电路包括RAM，用于存储772个时间通道中的每一个时钟信道的五个最新信息位以及表示特定时间信道携带成帧位模式的可能性的三个其他候选位。检查每个时间通道的当前和五个存储的信息位以检测六位成帧位模式。根据是否检测到成帧位模式的相位，并且更新的信息和候选比特存储在RAM中，候选比特在其预定限制内增加或减少其值。以这种方式对候选比特的修改仅在每第三个772比特帧中实现。根据候选位产生成帧信号。

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