'synchronizer' related articles 1

  1. 2008/04/28 ZL30131 - OC-192/STM-64 SONET/SDH/10GbE Network Interface Synchronizer
• Synchronizes to standard telecom or Ethernet backplane clocks and provides jitter filtered output clocks for SONET/SDH, PDH and Ethernet network interface cards
• Supports the requirements of ITU-T G.8262 for synchronous Ethernet Equipment slave Clocks (EEC option 1 and 2)
• Two independent DPLLs provides timing for the transmit path (backplane to line rate) and the receive path (recovered line rate to backplane)
• Synchronizes to telecom reference clocks (2 kHz, N*8 kHz up to 77.76 MHz, 155.52 MHz) or to Ethernet reference clocks (25 MHz, 50 MHz, 62.5 MHz, 125 MHz)
• Selectable loop bandwidth of 14 Hz, 28 Hz, 890 Hz, or 0.1 Hz
• Supports automatic hitless reference switching and short term holdover during loss of reference inputs
• Generates standard SONET/SDH clock rates (e.g., 19.44 MHz, 38.88 MHz, 77.76 MHz, 155.52 MHz, 622.08 MHz) or Ethernet clock rates (e.g. 25 MHz, 50 MHz, 125 MHz, 156.25 MHz, 312.5 MHz) for synchronizing Ethernet PHYs
• Programmable output synthesizers (P0, P1) generate telecom clock frequencies from any
multiple of 8 kHz up to 100 MHz (e.g., T1/E1, DS3/E3)
• Generates several styles of output frame pulses with selectable pulse width, polarity, and frequency
• Configurable input to output delay and output to output phase alignment
• Configurable through a serial interface (SPI or I2C)
• DPLLs can be configured to provide synchronous or asynchronous clock outputs

• ITU-T G.8262 Line Cards which support 1GbE and 10GbE interfaces
• SONET line cards up to OC-192
• SDH line cards up to STM-64


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