Guides
Guides
Original configuration and selection notes. Standard protocol names only—no third-party proprietary docs.
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GNSS antenna installation for NTP time servers
Sky view, cable loss, and surge protection—the three steps that decide GNSS lock stability for a cabinet NTP server.
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How to verify NTP stratum and offset on a LAN
Check reachability, LOCK, stratum, and offset so you do not mistake switch issues for a bad time server.
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NTP vs 1PPS vs IRIG-B accuracy by channel
1PPS, IRIG-B, Modbus, and NTP are different channels—mixing them in RFQs causes acceptance disputes.
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How to choose an industrial NTP server: QYTS-3000 vs 4000
Use QYTS-3000 for cabinet “good enough” NTP; choose the QYTS-4000 path for multi-port, rack form, and higher capacity.
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Public NTP pool vs local GNSS time server
Office PCs and auditable cabinet timing are different jobs. Firewalls, audit needs, and I/O decide if you need a local GNSS server.
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Firewall UDP 123 checklist when NTP clients will not sync
Many “timing failures” are network policy, not GNSS. Verify UDP 123 and ACLs before swapping antennas.
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What holdover means when GNSS drops for a short time
After unlock, time drifts. Drift depends on the oscillator and outage length—do not promise unlock-period accuracy with lock-state figures.