XRT7298

The XRT7298 device is a fully integrated PCM line driver IC intended for DS3, E3 or SONET STS-1 applications. Markets for the device includedigital cross connect system, CSU/DSU equipment, PCM test equipment and fiber optic terminals.

The XRT7298 complies with industry standards: ITU-T G.703, Bellcore TR-NWT-000499, bulletin 119 and the AT&T technical advisory No. 34.

The XRT7298 is an enhancement to the XRT7296 integrated line trans-mitter IC. In particular, the XRT7298 device contains an on-chip transmit clock duty cycle correction circuit.

The transmit clock duty cycle correction circuit guarantees that the device will generate pulses meeting the industry standard pulse template requirements. Also, it permits the user to supply a transmit clock signal (to the device) with a duty cycle ranging between 30% and 70%. This feature eliminates the need forthe user to provide a clock driver IC in their system in order to meet the transmit clock signal duty cycle requirements for the XRT7296 device. The XRT7298 includes an on-chip pulse shaper circuit that permits the device togenerate pulses which comply with the industry standard pulse template requirements. This device includes both B3ZS/HDB3 encoder and decoder circuitry.