DS26556 Overview
The DS26556 is a quad, software-selectable T1, E1, or J1 transceiver with a cell/packet/TDM interface. It is posed of four framer/formatters + LIUs, and a UTOPIA (cell), POS-PHY™ (packet), and TDM backplane interface. Each framer has an HDLC controller that can be mapped to any DS0 or FDL (T1)/Sa (E1) bit.