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The Digital Interface Unit ISDN module (DIUN2) for HiPath 4000, implements two Primary Access (PMA)-interfaces S2, in accordance with CCITT : Incoming block signals of the lines 0 and 1. Transfer Rate: 2048 kbit/s, Encoding: HDB3 outgoing block signals of the signaling channel and 1 signaling channel per line.
These boards are designed to connect to public and private E1 networks and subscribers. Also, the boards fulfill the Nx64Kbit feature. The DIU-N2 has two/four line-interfaces (ports). If the LTUW shelf use the LTUCX board, then the DIU-N2 can choose between the old or the new PCM highways. If the LTUW shelf use the LTUCE board, then the DIU-N2 is connected to the old PCM highways.