LST ETS 300 402-5 Leid.1-2006 Integrated Services Digital Network (ISDN); Digital Subscriber Signaling System No. One (DSS1)-Protokoll; Datenverbindungsschicht;
2006LST ETS 300 402-5 Leid.1-2006 Integrated Services Digital Network (ISDN); Digital Subscriber Signaling System No. One (DSS1)-Protokoll; Datenverbindungsschicht;