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ISDN Network Termination Units have been developed by INTRACOM in order to provide high quality ISDN services to the customers and high speed Internet access, offering additionally compatibility with existing analog equipment.Access to the ISDN exchange is accomplished through the U-line (160 Kbit/sec) providing two 64 Kbit/sec voice/data channels (B-channels) and one 16 Kbit/sec signalling channel (D-channel) to the customers terminals.