VCL-2156 NTP Time Server with multi-constellation and redundancy support – Application note

VCL-2156 NTP Time Server is an advanced dual-band GPS clock supporting multi-constellation L1 (GPS, GNSS, SBAS, Galileo) and L5 (GPS, NavIC, Galileo-E5a, BeiDou-B2a) signals. Leveraging this dual-frequency capability, it delivers exceptional accuracy, reliability, and resilience. Integrated Multipath Mitigation with Dynamic Satellite Selection ensures optimal signal integrity even in challenging environments.

Multi-constellation GNSS Receiver Supports Anti-Jamming and Anti-Spoofing: Protects against interference and false GNSS signals to ensure secure and reliable time synchronization.

1+1 Redundancy with NTP Peering Feature: The VCL-2156 NTP Server supports the NTP Peering feature, allowing two NTP servers to operate in a main and standby configuration. For this setup, connect the GPS antenna to both NTP servers, as shown in the diagram.

NTP Peering: NTP Peering enables two or more NTP servers to exchange time information reliably. Benefits include:

• Redundancy: Ensures continuous time synchronization if one server fails.
• Configuration: Both units must be configured with each other's NTP IP addresses for point-to-point (P2P) communication.

Operational Scenarios:

1. Normal redundant configuration





2. VCL-2156 #1 device loses its GPS Antenna or communication, then NTP #2 takeovers the NTP traffic





3. VCL-2156 #2 device loses its GPS Antenna or communication, NTP #1 takeovers the NTP traffic

This setup enhances reliability and ensures accurate timekeeping for critical applications where zero-failure conditions are required.

About Valiant Communications: Valiant Communications is a manufacturer and exporter of a wide range of communications, transmission, protection, synchronization, NAS data storage equipment and cybersecurity products. It is an approved manufacturer to some of the major power utilities including Power Grid Corporation (India) and various National and State Electricity Boards, with track record of successful installations in more than 5,500+ power sub-stations worldwide including at 765kV, 440kV, 400kV, 384kV, 220kV, 132kV, 110kV, 66kV and 33kV power sub-stations.