ZL30407

• Meets requirements of GR-253 for SONET Stratum 3 and SONET Minimum Clocks (SMC)
• Meets requirements of GR-1244 for Stratum 3
• Meets requirements of G.813 Option 1 and 2 for SDH Equipment Clocks (SEC)
• Generates clocks for ST-BUS, DS1, DS2, DS3, OC-3, E1, E3, STM-1 and 19.44 MHz
• Holdover accuracy of 4x10 -12 meets GR-1244 Stratum 3E and ITU-T G.812 requirements
• Continuously monitors both references for frequency accuracy exceeding ±12 ppm
• Provides "hit-less" reference switching
• Compensates for Master Clock Oscillator accuracy
• Automatically detects frequency of both reference clocks and synchronizes to any combination of 8 kHz, 1.544 MHz, 2.048 MHz and 19.44 MHz reference frequencies
• Allows Hardware or Microprocessor control
• Pin compatible with ZL30410, ZL30402 and MT90401

The ZL30407 is a Network Element Phase-Locked Loop designed to synchronize SDH and SONET systems. In addition, it generates multiple clocks for legacy PDH equipment and provides timing for STBUS and GCI backplanes.