Description

The ZL38012LDF1 is a special purpose audio IC belonging to the electronic component family. The IC is highly integrated with features that provide functionality required for a central timing card in carrier-grade network equipment. The IC has various features such as input reference monitoring, automatic input reference selection, support for external timing and line timing modes, hitless reference switching, wander and jitter filtering, independent derived output timing path for SETS functionality, and many more.

Specifications and features

• Supports ITU-T G.8262 for synchronous Ethernet equipment slave clocks (EEC option 1 and 2)
• Supports the requirements of Telcordia GR-1244 Stratum 3 and GR-253, ITU-T G.813, and G.781 SETS
• Supports ITU-T G.823, G.824 and G.8261 for 2048 kbit/s and 1544 kbit/s interfaces
• Meets the SONET/SDH jitter generation requirements up to OC-48/STM-16
• 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)
• Supports composite clock inputs (64 kHz, 64 kHz + 8 kHz, 64kHz + 8 kHz + 400 Hz)
• Generates standard SONET/SDH clock rates or Ethernet clock rates for synchronizing Gigabit Ethernet PHYs
• Programmable output synthesizers (P0, P1) generate telecom clock frequencies from any multiple of 8 kHz up to 100 MHz
• Provides two DPLLs which are independently configurable through a serial interface

Application Scenarios

The ZL38012LDF1 ICs can be used in various application scenarios such as ITU-T G.8262 System Timing Cards which support 1 GbE and 10 GbE interfaces, Telcordia GR-253 Carrier Grade SONET/SDH Stratum 3 System Timing Cards, and System Timing Cards that support ITU-T G.781 SETS.

Comparison

• Highly integrated with all the required functionalities for the central timing card
• Supports various telecom reference clocks and Ethernet reference clocks
• Supports composite clock inputs
• Flexible input reference monitoring

• No significant disadvantage found