A single chip integrated data link control (IDLC) device provides full duplex data throughput and versatile protocol adaptation between variably configured time channels on a high speed TDM digital link (e.g. T-1 or T-3 line) and a host data processing system. The device can handle multiple channels...http://www.google.de/patents/US5121390?utm_source=gb-gplus-sharePatent US5121390 - Integrated data link controller with synchronous link interface and asynchronous host processor interface
