Fronthaul Switches

Fronthaul Switches

5G networks are becoming more flexible and more interoperable with the disaggregation of the base band unit (BBU). The Ethernet-based fronthaul, using the eCPRI protocol, now connects the separated functional units with time synchronization that is 10x more stringent than in past generations.

SiTime MEMS timing products provide a complete solution – one that is more robust and accurate, capable of meeting the timing challenges of 5G RAN. Our Elite Platform® Super-TCXOs and Emerald™ OCXOs provide the stability engine in fronthaul switches, and our Cascade™ network synchronizer manages the IEEE 1588 loop and eCPRI/SyncE interface.

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SiTime MEMS Timing Benefits

Complete MEMS clock tree

Precision MEMS TCXO

Stratum 3E MEMS OCXO


More robust in real world conditions

4x better dF/dT for accurate IEEE 1588

Resistant to airflow, heat, vibration

Smart clock monitoring and hit switching for redundancy

Integrated MEMS, easy to use

No external quartz

No quartz reliability issues

No cover or shielding needed

Fronthaul Switch block diagramSiT57xxSiT53xx,

MEMS Timing Solutions for Ethernet-based Fronthaul or IP RAN Switch

MEMS Timing Solutions Function Frequency Key Features
SiT535x Super-TCXO Reference clock for jitter cleaner and IEEE 1588 1 MHz to 220 MHz ±100 ppb, ±1 ppb/°C 105°C
SiT57xx OCXO 1 MHz to 60 MHz ±5 ppb, ±0.04 ppb/°C
SiT9514x Network Synchronizer Ethernet, processor 8 kHz to 2.1 GHz 4-in, 11-out, 4-PLL

SiT9501 Differential XO

SiT9375 Differential XO

Ethernet, FPGA 25 MHz to 644.53125 MHz 0.1 to 0.2 ps jitter, 105°C

MEMS Timing Outperforms Quartz

Better Stability

Better Frequency Slope

Image: Elite Super-TCXO stability graphs


Image: Elite Super-TCXO frequency slope graphs


Better Vibration Resistance

Better Aging

Image: Elite Super-TCXO vibration resistance graphs


Image: Elite Super-TCXO aging graphs


Better Allan Deviation

Better PSNR (Power Supply Noise Rejection)

Image: Elite Super-TCXO allan deviation graphs


Image: Elite Super-TCXO power supply noise rejection graphs


Watch Video: SiTime MEMS Timing Solutions for Open RAN

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