Ptp-hw-assist Nokia Upd -
show ptp statistics show ptp clock show ptp hardware-assist status
show ptp timestamp-stats
| Feature | Without PTP-HW-Assist | With Nokia PTP-HW-Assist | |---------|----------------------|---------------------------| | Timestamp accuracy | ±100–500 ns (variable) | ±5–10 ns | | Time error (10 BC hops) | ±1.5 µs | <±200 ns | | Max PTP rate (pkt/s) | 32–64 (CPU limited) | 128+ (line rate) | | 5G TDD ready | Borderline | ✅ Yes | | ITU-T Class | A or B | C or D | ptp-hw-assist nokia
Nokia’s FPGA- and ASIC-based implementations allow operators to chain dozens of boundary clocks while maintaining sub-microsecond accuracy. When evaluating Nokia switches and routers for timing-sensitive roles, always check for hardware timestamping support in the data sheet; it makes the difference between a network that just works and one that meets 5G’s stringent synchronization requirements.
: Use show system ptp to confirm the operational status of the hardware-assisted clock. show ptp statistics show ptp clock show ptp
To understand the necessity of ptp-hw-assist , one must first appreciate the shift in synchronization sources. In the past, the network itself carried the clock. T1/E1 lines and SDH/SONET networks derived synchronization from physical layer framing, providing inherently accurate clock recovery.
: Ensure the underlying physical port does not have port-type ptp configured. To understand the necessity of ptp-hw-assist , one
To verify PTP hardware assist on a Nokia 7x50 series:
Optimizing Time Sync in Carrier Networks: A Deep Dive into PTP-HW-Assist on Nokia Routers
| Component | Role | |-----------|------| | | In 7250 IXR routers, FP4/FP5 chips perform line-rate, hardware-based PTP timestamping. | | Nokia Timing and Synchronization (T&S) FPGA | In 7210 SAS and 7705 SAR, dedicated timing FPGAs time-stamp all PTP packets on ingress/egress. | | Integrated PHY with IEEE 1588 support | On lower-end access devices, PHY-level assist reduces jitter below 10 ns RMS. | | PTP profile support | Hardware assist works seamlessly with G.8275.1 (full timing support), G.8275.2 (partial timing), and 3GPP profiles. |