Birds-of-the-Air Press(SNA/SDLC) and X.25 High-Level Data Link Control (HDLC) because these protocols require expensive synchronous interfaces and modems designed specifically for

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Birds-of-the-Air Press(SNA/SDLC) and X.25 High-Level Data Link Control (HDLC) because these protocols require expensive synchronous interfaces and modems designed specifically for

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