ORAN Distributed Unit

Image: ORAN Distributed Unit

5G Open RAN brings greater flexibility to networks that are becoming increasingly dense with equipment deployed further from the core, sometimes in less-controlled environments. At the same time, these components need precise synchronization to avoid data packet loss and network interruptions.

This puts a greater demand on the distributed unit (DU) timing solution as it synchronizes the time reference from the core to the fronthaul switch and out to the RU. If the timing reference is lost, the DU must maintain an accurate output clock (holdover) until the connection to the reference is restored. SiTime provides a complete all-silicon MEMS clock tree that is more robust and easy to configure for accurate IEEE 1588 timing.

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SiTime MEMS Timing Benefits

Complete MEMS clock tree

Precision MEMS OCXO

4 input network synchronizer

Integrated MEMS eliminate quartz reliability issues

More robust in real world conditions

±40 ppt/°C dF/dT for accurate IEEE 1588

I2C monitoring for simplified compensation

Immunity to board level noise

Easily configurable clocking

Hitless switching for minimal disruptions

Flexibility of 4 independent time domains

Low wander mode for optimal holdover

ORAN Distributed Unit Block Diagrams

Clock Tree for Open RAN with IEEE 1588

 

Clock Tree for NPU Based Open RAN DU

MEMS Timing Solutions for Precision Synchronization

Devices Function Key Features
OCXO
SiT5711  1 to 60 MHz
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Stability Engine for IEEE 1588 Clock Recovery ±5 ppb, ±40 ppt/°C dF/dT
Digitally Controlled OCXO
SiT5721  1 to 60 MHz
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Stability Engine for IEEE 1588 Clock Recovery ±40 ppt/°C dF/dT, I2C Programmable
Network Synchronizer
SiT95147  8 kHz to 2.1GHz
Monitor SyncE and eCPRI inputs, facilitate IEEE 1588 loop 120 fs jitter for SyncE,
4 inputs and 8 outputs
Network Synchronizer
SiT95148  8 kHz to 2.1GHz
Monitor SyncE and eCPRI inputs, facilitate IEEE 1588 loop 120 fs jitter for SyncE,
4 inputs and 11 outputs

MEMS Timing Outperforms Quartz

Better Stability

Better Frequency Slope

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SiTime – Better Stability
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SiTime – Better Frequency Slope

 

Better Allan Deviation

Faster Warm Up

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SiTime – Better Allan Deviation
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SiTime – Faster Warm Up

 

Lower Supply Voltage Sensitivity

Fastest Hitless Switching

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SiTime – Lower Supply Voltage Sensitivity
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SiTime – Fastest Hitless Switching

Watch Video: SiTime MEMS Timing Solutions for Open RAN

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