The NB4L858M is a high-bandwidth low voltage fully differential dual 2 x 2 crosspoint switch with CML outputs that is suitable for applications such as SDH/SONET DWDM and high speed switching applications. Design technique minimizes jitter accumulation, crosstalk, and signal skew which make this device ideal for loop-through and protection channel switching application. Each 2 x 2 crosspoint switch can fan out and/or multiplex up to 3 Gb/s data and 3 GHz clock signals.