• Synchronizes with standard telecom system references and synthesizes a wide variety of protected telecom line interface clocks that are compliant with Telcordia GR-253-CORE and ITU-T G.813
• Internal APLL provides standard output clock frequencies up to 622.08 MHz that meet jitter requirements for interfaces up to OC-192/STM-64
• Programmable output synthesizer generates clock frequencies from any multiple of 8 kHz up to 77.76 MHz in addition to 2 kHz
• Provides 3 reference inputs which support clock frequencies with any multiples of 8 kHz up to 77.76 MHz in addition to 2 kHz
• Supports automatic hitless reference switching, automatic mode selection (locked, free-run, holdover), and selectable loop bandwidth
• Generates several styles of output frame pulses with selectable pulse width, polarity, and frequency
• Flexible input reference monitoring automatically disqualifies references based on frequency and phase irregularities

The ZL30117 SONET/SDH Line Card Synchronizer is a highly integrated device that provides timing and synchronization for network interface cards. The DPLL is capable of locking to one of three input references and provides a wide variety of synchronized output clocks and frame pulses.