Selection
School campus NTP: local GNSS vs public pool
When exams, one-card, and campus security must be auditable, put GNSS NTP in the network room—do not rely on a public pool alone.
Updated 2026-08-22
Decision
Schools: SY-1231 first. Labs that mandate IRIG → coming 4096.
Notes
K–12, vocational, and university network rooms typically need one LAN clock for lab PCs, exam/grading, one-card, and campus NVRs.
A public pool is fine when egress is stable and there is no on-campus time-source mandate. If UDP 123 is firewalled or audit requires a local source, deploy SY-1231.
Primary SKU SY-1231-BG-T-S: BeiDou+GPS, TCXO, single 10/100M, design reply 3840 req/s, no IRIG, no OCXO, no PTP. Default IP 192.168.1.123.
Specify coming SY-4096 only when a physics/media lab or campus TV plant writes IRIG-B / OCXO. Ship 1231 for stock delivery.
Commission from the NTP client checklist: prove UDP 123 and LOCK, then spot-check one lab PC and one NVR. Do not accept student-PC offset against GNSS nanoseconds.
FAQ
- What is the decision?
- Schools: SY-1231 first. Labs that mandate IRIG → coming 4096.
- What are the key points?
- When exams, one-card, and campus security must be auditable, put GNSS NTP in the network room—do not rely on a public pool alone.