Application Notes

About Peering and Stratum 2 (PDF)
Description: NTP Servers are primarily designed for Stratum 1 operation, but also support Stratum 2. The best use for a Stratum 1 time server is as an INDEPENDENT source of reliable & accurate time. NTP products can be configured for peering but we don’t recommend it for Stratum 1 Time Servers. This paper explains why. It also explains the difference between Stratum 2 mode and peering, and a couple of recommended network configurations that ensure the best time.
Best Practices to Secure Your Time Server (PDF)
Description: These are the steps we recommend to further secure a NTP Time Server on a private network, behind a firewall. For installations on a public network there should be additional safeguards such as changing User Accounts. These additional safeguards are not described in this paper.
Description: Large earth stations host communication systems that provide mission-critical, high-bandwidth services to multiple customers. Within these earth stations are many frequency-based devices with independent local oscillators that generate and convert carrier frequencies, and modulate and demodulate data. Locking these oscillators to a common, stable and low-noise frequency reference distribution system is fundamental to minimizing frequency issues and supporting higher data rates. This application note focuses on the important role and benefits of a frequency reference distribution system, design considerations, and best practices to deploy a system that meets large earth station reliability and quality-of-service requirements.
Description: The satellite communications infrastructure provides critical services for government and civil applications at increasing carrier frequencies and data rates. Within the ground and space-borne systems are devices that generate microwave level frequencies that form uplinks and downlinks.