A data terminal equipment which is coupled to an ISDN through an access line and uses a hierarchical protocol in conformity to an OSI reference standard model includes the following structural elements. A first data link protocol circuit provides a link access procedure balanced (LAPB) modulo-8 data...http://www.google.es/patents/US5012470?utm_source=gb-gplus-sharePatente US5012470 - Data terminal equipment and data transmission control method
Data terminal equipment and data transmission control method
