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X.25 Switch X.25 Frame Relay TCP X.25 Gateway PPP X.3 PAD FRAD IP Router LAN Bridge HDLC SDLC VoIP VoFR FRF.15 FRF.11 FRF.
X.25 Switch X.25 Frame Relay TCP X.25 Gateway PPP X.3 PAD FRAD IP Router LAN Bridge HDLC SDLC VoIP VoFR FRF.15 FRF.11 FRF.