The CN8380 is a fully integrated quad line interface unit for both 1.544 Mbps (T1) and 2.048 Mbps (E1) applications. It is designed to complement T1/E1 framers or operate as a stand-alone line interface to synchronous or plesiochronous mappers and multiplexers. The device can be controlled through a host mode serial port or by hardware mode operation, where device control and status are obtained through non-multiplexed dedicated pins. Many of these pins are also dedicated to individual channels for maximum flexibility and for use in redundant systems. Integrated in the CN8380 device is a clock rate adapter (CLAD), which provides various low-jitter programmable system clock outputs. The receive section of the CN8380 is designed to recover encoded signals from lines having up to 12 dB of attenuation. The transmit section consists of a programmable, precision pulse shaper.