公开(公告)号：US3952162A

公开(公告)日：1976-04-20

申请号：US581081

申请日：1975-05-27

申请人： Alain G. Texier ,  Michel R. Davancens

发明人： Alain G. Texier ,  Michel R. Davancens

IPC分类号： H04J3/00 ,  H04L12/52 ,  H04Q11/04

CPC分类号： H04J3/0611 ,  H04L12/52

摘要： A time division digital switching network comprises first multiplexing means in which first-order digital data channels transmitting words consisting of a given number of bits and having first rates which are different from but multiples of one another undergo a first multiplexing converting them into a second-order digital data channels having a second predetermined rate. Thereafter there are provided second multiplexing means in which the second-order digital channels undergo a second multiplexing converting them into third-order digital data channels having a third predetermined rate. In a digital switching unit having at least one buffer store, the first-order-channel words multiplexed into the third-order channels are grouped at an address whose first part depends upon the second-order channel they occupy in the third-order channel and whose second part depends upon the first-order channel they occupy in the second-order channel. The bits of a given rank of the words of a second-order channel form a pseudorandom sequence having a known period and, therefore, the bits of a given rank of the words of a third-order channel form a number of interleaved pseudorandom sequences. The digital switching unit includes means for separating the interleaved pseudorandom sequences and for deducing from the bits composing them the second part of the address of the words.

摘要翻译： 时分数字交换网络包括第一多路复用装置，其中传送由给定数量的比特组成的具有第一速率的一阶数字数据信道，其中第一速率彼此不同但是彼此的倍数经过第一复用，将它们转换为第二复用装置， 具有第二预定速率的数字数据通道。 此后，提供第二多路复用装置，其中二阶数字信道进行第二复用，将它们转换成具有第三预定速率的三阶数字数据信道。 在具有至少一个缓冲存储器的数字切换单元中，多路复用到三阶信道中的一阶通道字被分组在其第一部分取决于它们在三阶信道中占据的二阶信道的地址， 其第二部分取决于他们在二级渠道中占据的一级渠道。 二阶通道的字的给定秩的位形成具有已知周期的伪随机序列，因此，三阶通道的字的给定秩的位形成交错的伪随机序列的数目。 数字切换单元包括用于分离交织的伪随机序列和从构成它们的比特中排除词的地址的第二部分的装置。