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# - Add complete linuxptp-daemon pods to example output # - Update NodePtpDevice to show 5 workers with E810 NICs # - Fix MCP output with correct columns # - Change interface names to ens7f0 (E810 standard) # - Add note about customizing interface names # Resolves: TELCODOCS-2500
17 lines
1.6 KiB
Plaintext
17 lines
1.6 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * networking/ptp/configuring-ptp.adoc
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:_mod-docs-content-type: CONCEPT
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[id="cnf-configuring-gnss-ntp-failover_{context}"]
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= Configuring GNSS failover to NTP for time synchronization continuity
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[role="_abstract"]
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Automatic failover from global navigation satellite system (GNSS) to Network Time Protocol (NTP) maintains time synchronization continuity when the primary signal is lost, ensuring system stability for telco operations.
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Telco operators require time source redundancy to ensure time synchronization continuity and system stability.
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{product-title} provides automatic failover capabilities to maintain synchronization. The system utilizes GNSS (delivered by `phc2sys`) as the primary time source. To protect against primary signal loss, such as jamming or antenna failure, the system automatically transitions to the secondary time source, NTP delivered by `chronyd`. Upon signal recovery, the system automatically switches back to and resumes synchronization with `phc2sys`.
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You can control the resilience of the time synchronization by setting the `ts2phc.holdover` parameter in seconds. This value dictates the maximum time the internal control algorithm can continue synchronizing the PHC after the main time of day (ToD) source such as a GNSS receiver is lost. The algorithm can only continue if it remains in a stable state (SERVO_LOCKED_STABLE). When the process exits this configured holdover period, it signifies an unrecoverable primary signal loss. The system then allows failover to a secondary source such as NTP.
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