FRITZ! Computer Systems modem, ISDN, 128 Kbit/s, 16 MB, Intel Pentium, 220 x 150 x 30 mm FRITZ! Computer Systems modem. Data link protocols: ISDN. Modem speed: 128 Kbit/s. Minimum RAM: 16 MB, Minimum processor: Intel Pentium. Dimensions (WxDxH): 220 x 150 x 30 mm