| 摘要 |
<p>Data containing traffic volume statistics are preferably transmitted in packet form with packets of equal length via virtual links. In a packet switching device, it is essentially possible that two or more packets may arrive simultaneously from different lines but are intended to be forwarded along the same line. …<??>For this reason, buffer memories must be provided, in which the packets which cannot be forwarded immediately are queued. The memory capacity required for this purpose depends not only on the length of the packets but in particular on the number of converging lines, the type of traffic volume and the transmission quality required. In known packet switching devices, around 80% of all the chip surfaces are used within the switching network for these memories. …<??>According to the invention, a fixed number of packets are combined within the exchange in each case to form a frame, all packets are divided into packet parts of equal length and are distributed among sub-frames. Switching is carried out on the basis of sub-frames using synchronous time-division multiplexing. The memory space required in the switching network is reduced by the frame : sub-frame ratio. The memories used are those which are required in any case for synchronous time-division multiplex switching. …<IMAGE>… </p> |
