Conceptronic 128 KBPS (2X64 KBPS) PCI I, X.75. V120. HDLC. PPP (Async to sync), 128 Kbit/s, 1 x ISDN(RJ-45) Conceptronic 128 KBPS (2X64 KBPS) PCI I. Data link protocols: X.75. V120. HDLC. PPP (Async to sync). Modem speed: 128 Kbit/s. I/O ports: 1 x ISDN(RJ-45)