DIGITAL SWITCHING SYSTEM

专利名称：DIGITAL SWITCHING SYSTEM发明人：DANIEL CALY UPP申请号：AU4015085申请日：19850320公开号：AU4015085A公开日：19851003

摘要：There is disclosed an apparatus for enabling one to increase the bandwidth of amulti-channel digital switching system. Essentially, the system allows one to set up multi-channel link paths to obtain a total band width of N times the bandwidth of a typicalswitching path in a digital switching network. To do this, a common frame counter islocated in the unused bit positions of the sample in each of the paths, forming awideband channel. At the receive end, the apparatus de-skews the received samples toproperly reassembly the output. This operation is provided by utilizing one contentaddressable memory and an associated random access memory (CAM/RAM) (C/R) foreach channel to be joined. The width of each C/R is twelve bits, eight for data, the read-out section and four for frame counter, which is the associative section. The length ofeach C/R is a function of the maximum skew to be counted. A four bit output framecounter provides the associative addresses for the C/R which, when given an associativeaddress corresponding to a frame number, will respond with an eight bit data word forthat frame or with an Empty signal, meaning that no word exists for that frame number.At initialization the frame counter presets to one and all C/Rs are interrogated to see ifthey contain frame one information. If they do not, then the output frame counter isindexed and all C/Rs are re-interrogated at a fast rate until they all indicate not Empty. At

this point, the outputs of each C/R for the frame count indicated are assembled into anoutput word. Thus as long as all the C/Rs indicate not Empty, frame integrity is insured,and hence the distributed control switching system can provide wideband operation viamulti-channel linked paths while insuring frame integrity.

申请人：ITT CORP.

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