The MT90812 provides non-blocking timeslot interchange capability for B, C and D channels, up to a maximum of 192 channels. It offers conference call capability for 15 parties over a maximum of 5 conference bridges. With its integrated PLL, the MT90812 provides the necessary clocks to support peripheral devices, such as codecs or interconnected IDX devices. Integrated into the IDX is the capability to detect supervisory signalling and to generate FSK 1200-baud signals. In addition, an integrated digital tone generator produces continuous dual tones, including standard DTMF.