Meaning
Intermediate node equipment identifies the most accurate available clock source to synchronize local oscillators across an Ethernet topology. Using boundary clocks inside a subnetwork terminates the external timing flow and initiates a fresh source signal for downstream ports. This equipment maintains a single slave port to ingest time from a grandmaster while operating multiple master ports to distribute it forward.
Network jitter remains low because the local clock filters noise before propagating the value.
Signal Regeneration
Node hardware extracts timestamps from high precision packets to discipline its own quartz or rubidium frequency. Because boundary clocks act as a local reference, they remove the buildup of queuing delay associated with switches that only pass data.
Local Processing
Dedicated silicon handles message exchange directly at the physical layer to reduce variance. Latency across the circuit board is calculated and subtracted from the output. Every port maintains its own state machine to manage incoming requests or announcements.
Software limits ensure no single erroneous source corrupts the site timing.
Network Topography
Designing an architecture with these nodes prevents the cumulative error found in standard cascaded switches. Performance hinges on the quality of the internal oscillator. Low stability components require more frequent updates from the primary master to hold sub-microsecond precision.
The cost of synchronization rises as deeper node hierarchies demand better hardware.
