1)Signaling gateway, converter any signaling between SS7, ISDN PRI, Q.SIG, V5.2. R2; 2)Clocking source: E1, internal; Description:NC-AD300D is designed and manufactured ... ), with its embedded ARM9 CPU and Linux operation system. NC-AD300D is a cost effective, powerful, reliable and stable signaling converter.Specification:·Signaling support: SS7, PRI ...