- Private Integrated Services Network (PISN); Inter-exchange signalling protocol - Circuit mode basic services - Data Link Layer (DLL) - Part 1 : Test Suite Structure and Test Purposes (TSS & TP) (1e uitgave)
- Private Integrated Services Network (PISN); Inter-exchange signalling protocol - Circuit mode basic services - Data Link Layer (DLL) - Part 1 : Test Suite Structure and Test Purposes (TSS & TP) (1e |$$|AGEdition)