ACCURATE TIME CLOCK IN RECORDED VIDEO GENERATOR

In addition to their main purpose of providing position information, Global Navigation Satellite Systems also provide highly accurate time-of-day information. The backup supply undergoes a brief load test automatically each day and the user can be notified if this test fails. The SPG9000 will monitor the temperature-weighted hours of the active supply and alert the user when it approaches the rated limit. This ensures that they are not used at the same rate and will not potentially fail at about the same time. Unlike simpler devices, the SPG9000 has a designated active power supply and an idle backup supply. Most facilities require the timing reference to be available continuously and the SPG9000 has an innovative dual power supply system to assist high availability.

Avoiding an abrupt “jam” when the SPG9000 is re-locked ensures that no “synchronization shock” will be observed by follower devices. When the reference input signal is restored, the holdover recovery process adjusts the clock slowly to eliminate any accumulated phase difference. If the received GNSS signal or genlock input signal is temporarily lost, the SPG9000 will switch to holdover mode in which this clock maintains its time and phase from the previous lock. The SPG9000 has a high-quality oven-controlled crystal oscillator (OCXO) for its internal clock.

ACCURATE TIME CLOCK IN RECORDED VIDEO GENERATOR

Resiliency and reliability are essential attributes for a timing reference generator since it is a mission-critical component for the video facility. Resilient to Interruption and Reliable for Continuous Operation The two 25 Gbps ports for IP traffic can operate independently or as redundant links per ST 2022-7. The SPG9000 can also function as an NMOS-controlled media sender, generating video, audio and data reference test signals over ST 2110 IP streams. The backup will use PTP to sync to the primary, and takeover with no time disturbance when it switches from follower to leader. For example, if GNSS-based time synchronization is not available (perhaps because there is no clear view of the sky for the antenna), a pair of SPG9000 systems can still function as a primary + backup pair for redundancy. ST 2059 and AES67) or can connect to both sides of redundant networks.įor easy connectivity to spine or backbone switches, each PTP port of the SPG9000 can connect at either 10 Gbps or 1 Gbps line rate, using SFP+ transceiver modules.Įach PTP instance of the SPG9000 can operate as a leader only, a follower only, or use “Ordinary Clock” mode which can adapt between leader and follower as required. With two independent ports and PTP engines, each SPG9000 can provide PTP for two different domains (e.g. The SPG9000 can use a GNSS signal as the time source and serve as a PTP grandmaster for the video network. In modern IP-based facilities, PTP is distributed for timing and synchronization to a common source.

Accurate time clock in recorded video