FRITZ! ISDN-Controller B1 PCI v4.0, ISDN, 128 Kbit/s, X.75, T.30, T.70NL, T.90, X.31, V.110, V.120, 657 g, 205 x 290 x 80 mm FRITZ! ISDN-Controller B1 PCI v4.0. Data link protocols: ISDN. Modem speed: 128 Kbit/s, B-channel protocols: X.75, T.30, T.70NL, T.90, X.31, V.110, V.120. Weight: 657 g, Dimensions (WxDxH): 205 x 290 x 80 mm