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The LS/GS board, also called NDDI2 board, is an analog board which allows the PABX to be connected to most of the public networks. Furthermore, this board allows the PABX to be connected to a pager system according to the ESPA standard. The NDDI2 board can connect up to eight 2-wire analog lines. Lines 1 to 4 are processed on the mother board and lines 5 to 8 are processed on the QATI daughter board.