Note: ADCCP closely resembles high-level data link control[?] (HDLC) and synchronous data link control[?] (SDLC).
Source: from Federal Standard 1037C
... (SPP) Romanian Intelligence Service[?] [SRI] Russia Federalnaya Sluzhba Bezopasnosti (FSB, successor of KGB) Glavnoye Razvedyvatelnoye Upravlenie[?] ...