Method for switching ATM, TDM and packet data through a single communications switch
A technology of data and switches, applied in the field of telecommunication networks
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[0031] The device of the present invention generally includes a port processor and a switching unit. FIG. 1 illustrates the main characteristics of the port processor 10, and FIG. 2 illustrates the main characteristics of the switching unit 100. Referring now to FIG. 1, the port processor 10 includes a SONET interface and a UTOPIA interface. On the entry (RX) side, the SONET interface includes a serial-to-parallel converter 12, a SONET framer and transmission overhead (TOH) extractor 14, a high-order pointer processor 16, and a path overhead (POH) extractor 18. For ATM and IP packets transmitted in the SPE, the ingress side of the SONET interface includes 48 HDLC (high-level data link control) framers 20 (for IP), 48 cell delimiters 22 (for ATM), and 48 64-byte FIFO 24 (for both ATM and IP). For the TDM signal transmitted in the SPE, the entry side of the SONET interface includes a demultiplexer and a low-level pointer processor 26. On the egress (TX) side, the SONET interface inc...
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