ZL30407
SONET/SDH Network Element PLL
NOT AVAILABLE FOR NEW DESIGNS
Overview
The ZL30407 is a digital phase-locked loop (DPLL) designed to be the heart of network synchronization cards in SONET and SDH network equipment. The ZL30407 accepts two network references, monitors the references for frequency accuracy and consistency, it locks to the selected reference and filters it per the network type and outputs a range of low jitter clocks with common telecom frequencies. The ZL30407 maintains stable output clocks when switching from one network reference to another and it uses digital storage techniques to maintain accurate output frequencies if all network references are lost. The ZL30407 manages changes in its operating state between normal mode, holdover mode and free-run mode in accordance with network specifications.
Features & Benefits
- 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
- Meets holdover accuracy of GR-1244 Stratum 3E and ITU-T G.812 (better than 1x10-12)
- Continuously monitors both references for frequency accuracy exceeding +/-12 ppm
- Provides "hit-less" reference switching
- Compensates for Master Clock Oscillator accuracy
- 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 ZL30402 and MT90401
Resources
Documentation
Application Notes
- ZLAN-68 - List of Oscillators & Crystals that can be used with Microsemi's PLL, Digital Switches with Embedded PLL & Timing over Packet Devices
- ZLAN-71-Applications of the Digital PLLs Design Guidelines for Using Oscillators
Product Previews
Applications
Typical Applications
- Synchronization for SDH and SONET Network Elements
- Clock generation for ST-BUS and GCI backplanes
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