A nonblocking digital crosspoint switch

摘要

In a strictly nonblocking cross-point space switch central stage (101) for the switching of SDH frames or other formats the port terminating each incoming link has a time slot interchange (TS1) unit (103, 106, 108). Each TS1 unit comprises incoming and outgoing sets of TSIs. The TSIs properly arrange each byte of each row of the STM-1 frame or other formats to be in the proper position for transmission on the STM-1 links. Within the STM-1 frame structure, each row of a frame is switched in an identical manner but the column designations within a row are switched differently. In response to rearranged frames from incoming TSIs, a cross-point switch is responsive to each column of each of the rows to switch each of the bytes of that column to the appropriate outgoing TS1 for rearrangement and transmission on a STM-1 link. <IMAGE>