High-Level Data Link Control(A protocol for information transfer adopted by the ISO. HDLC is a bit-oriented, synchronous protocol that applies to the data-link (message-packaging) layer (layer 2 of the ISO/OSI reference model) for computer-to-microcomputer communications)
externes Fehlerprotokoll auf Mandantenebene(An error log that contains errors and exceptions that occur when SharePoint tries to connect to external systems through Business Connectivity Services. It can be retrieved by tenant administrators)