Time and Frequency System for

Broadcast Television Network Synchronization

Broadcast television networks require frame-accurate time synchronization across playout servers, studio cameras, audio mixers, transmission equipment, and regional head-ends. Any timing drift causes lip-sync errors, frame drops, and program disruption. The transition from SDI to IP-based workflows (SMPTE ST 2110) further increases the importance of accurate timing, as packet-based video streams rely on Precision Time Protocol (PTP) for alignment.

Professional broadcast environments demand reference-grade 10MHz, 1PPS, and time code (IRIG-B/TOD) distribution with seamless switching capabilities. The timing system must support both legacy SDI equipment and modern IP-based infrastructure, often operating in parallel during facility upgrades.

System Requirements

A broadcast timing system must satisfy the following requirements:

• Generate house sync references (10MHz, 1PPS, IRIG-B, TOD) traceable to UTC

• Support seamless switching between multiple reference sources without signal interruption

• Distribute ultra-low phase noise 10MHz for SDI clock regeneration

• Provide IRIG-B and TOD time code for automation systems and recording equipment

• Deliver PTP Grandmaster functionality for IP-based broadcast workflows

• Maintain timing continuity during GNSS outages

Recommended Products

GS5210 Grandmaster Clock

The GS5210 is a comprehensive clock management device featuring a built-in high-performance synchronized clock source (crystal or rubidium oscillator selectable). It supports multiple frequency standard inputs, multiple 1PPS+TOD channels, and multiple B(DC) code inputs, enabling clock group management, time synchronization, and frequency synchronization. It delivers a wide range of timing signals including 10MHz, 1PPS, IRIG-B, and TOD.

GS5250 10MHz Frequency Seamless Switcher

The GS5250 Seamless Switch is a multi-channel frequency signal input switching and output device. It features a built-in high-stability clock source and employs high-precision frequency measurement algorithms with intelligent phase-locking technology. The device enables high-precision measurement and precise phase locking of multiple 10MHz input signals, supporting seamless switching between multiple references with smooth phase transitions.

GS5230 Phase Noise Filter

The GS5230 Reference Frequency Purifier is a phase noise filter designed to clean reference frequency signals. It removes jitter and phase noise from input references, providing an ultra-clean 10MHz output ideal for broadcast equipment requiring low-phase-noise house sync.

GS6601F Frequency Distribution Amplifier

The GS6601F distributes a single frequency input to multiple isolated output channels with low phase noise and excellent amplitude stability. It is optimized for broadcast environments requiring wideband frequency distribution to numerous pieces of equipment.

GS6606 Time Code Distribution Amplifier

The GS6606 integrates 1PPS pulse signals with time code signal distribution. It supports 2-channel TTL/LVTTL pulse input with frequency range covering 1PPS to 1MPPS and provides 12-channel output with selectable TTL/LVTTL levels. For time code signals, it supports 2 input channels and 12 output channels for TOD or IRIG-B(DC) distribution.

System Architecture

The GS5210 Grandmaster Clock locks to GNSS or studio house sync and generates studio-grade 10MHz, 1PPS, and time code references. The primary 10MHz output feeds the GS5230 phase noise filter to produce an ultra-clean reference, which then passes to the GS5250 seamless switcher. The switcher manages transitions between the primary GNSS-locked reference and a backup studio generator without phase discontinuity.

The GS6601F distributes the clean 10MHz reference to playout servers, video routers, frame synchronizers, and conversion equipment. The GS6606 handles IRIG-B and TOD distribution to automation systems, recording devices, and time displays.

For IP-based workflows, the GS5210 provides PTP Grandmaster functionality, distributing IEEE 1588v2 timing over the facility LAN to SMPTE ST 2110 devices including IP cameras, audio consoles, and streaming encoders.

Source	Signal Type	Distributor	Typical Consumers
GS5210	10MHz (Sine)	GS5230 + GS5250	Playout servers, video routers, frame syncs
GS5210	1PPS (TTL)	GS6606	Automation systems, recording devices
GS5210	IRIG-B(DC)	GS6606	Studio cameras, audio mixers, time displays
GS5210	TOD (RS422)	GS6606	Transmission controllers, head-end equipment
GS5210	PTP (1588v2)	Network Switch	IP cameras, audio consoles, streaming encoders

Integration Recommendations

• Use the GS5230 phase noise filter when the 10MHz reference drives more than 10 devices or when long cable runs introduce noise

• Configure GS5250 for automatic switching with a 1-second qualification period to avoid switching on brief signal anomalies

• Install separate 10MHz distribution trees for analog SDI equipment and digital IP equipment to prevent cross-contamination

• Verify PTP domain settings match across all SMPTE ST 2110 devices in the facility

• Schedule annual calibration of the GS5210 against a GPS-disciplined reference to maintain traceability

Conclusion

This broadcast timing architecture provides a complete solution for both traditional SDI and modern IP-based television workflows. The combination of GS5210 Grandmaster Clock, GS5250 seamless switcher, GS5230 phase noise filter, and GS6601F/GS6606 distribution amplifiers ensures frame-accurate synchronization across all broadcast equipment with uninterrupted reference delivery and comprehensive monitoring capabilities.