SMPTE ST 2110 Standard Suite
SMPTE ST 2110 is a modern suite of standards defining how professional video, audio, and ancillary data are transported over IP networks as independent, synchronizable streams. Unlike legacy SDI (a monolithic serial stream) or smpte-st-2022 (encapsulated SDI over IP), ST 2110 decouples media essences, enabling flexible, modular system design for large broadcast and media production facilities.
The standard is broken into several parts:
- ST 2110-10: Timing and synchronization (PTP/IEEE 1588)
- ST 2110-20: Uncompressed video
- ST 2110-30: Audio with AES3 compatibility
- ST 2110-40: Ancillary data (closed captions, metadata, timecode)
ST 2110 is increasingly mandated in broadcast facilities, large corporate AV installations, higher education media centers, and any environment where SDI infrastructure cannot scale to required complexity or distance. Understanding ST 2110 is becoming essential for professional AV integrators.
Key Requirements & Specifications
Core Architecture
ST 2110 transports each essence (video, audio, ancillary data) as independent RTP streams over IP. A single program flow may contain multiple video streams, multiple audio tracks, and associated metadata—all synchronizable via PTP.
Video (ST 2110-20): Uncompressed at broadcast frame rates (24p, 25p, 29.97p, 30p, 50p, 59.94p, 60p) and resolutions (HD, 4K, 8K). Requires approximately 4.5 Gbps for 1080p60 uncompressed video, necessitating 10 GE or higher.
Audio (ST 2110-30): Supports AES3 embedded audio and separate audio-only streams. Flexible channel counts (mono to 64+ channels). Synchronizes to video via PTP.
Ancillary Data (ST 2110-40): Carries SMPTE 291M ancillary packets (captions, timecode via SMPTE 12M, metadata, text overlays).
Timing (ST 2110-10): Precision Time Protocol (IEEE 1588v2) ensures video/audio sync across geographically distributed streams. Requires a PTP grandmaster with GPS or atomic clock reference.
Relationship to AES67
ST 2110-30 audio aligns with AES67 (AES digital audio interface over IP), enabling interoperability with Dante and professional audio networks. Audio is separately synchronized, allowing audio-only systems to coexist with media infrastructure.
Difference from sdi and smpte-st-2022
| Aspect | SDI | ST 2022 | ST 2110 |
|---|---|---|---|
| Architecture | Monolithic serial | Encapsulated stream | Separated essences |
| Distance | ~300m coaxial, ~100m fiber | IP range | IP range |
| Scalability | Point-to-point | Hybrid | Multi-layer switching |
| Flexibility | Fixed content structure | Single program | Modular, re-routable |
| Typical deployment | Studio patch panels | Small-to-medium facilities | Large broadcast, stadium, corporate |
Practical Application for AV Integrators
ST 2110 appears in:
- Regional broadcast stations upgrading from SDI baseband infrastructure
- Sports and live event venues requiring distributed camera/graphics/replay feeds
- University media production facilities with multiple simultaneous productions
- Corporate media hubs needing flexible, auditable content routing
- Post-production facilities incorporating live-to-tape workflows
AV integrators should recognize ST 2110 requirements when:
- System technical riders mandate it (increasingly common in large venue RFPs)
- Facility operators have more than 4-6 video feeds requiring centralized routing
- Long-distance distribution (beyond SDI coaxial limits) is necessary
- Future multi-format or 4K/8K capability is a project requirement
Common Pitfalls
Underestimating network infrastructure demands. Uncompressed 4K60 video exceeds 10 Gbps. Facility networks must support dedicated VLANs, QoS prioritization, and redundant paths. Generic Gigabit switching fails catastrophically.
Ignoring PTP synchronization. Without a properly configured PTP grandmaster (GPS-locked or atomic clock), audio/video sync drifts within minutes. This is not optional—it is foundational to ST 2110. Verify PTP infrastructure before equipment procurement.
Mixing ST 2110 and SDI devices without conversion infrastructure. ST 2110 devices cannot directly connect to SDI endpoints. Bridging hardware (SDI-to-ST 2110 gateways, media converters) must be explicitly budgeted and validated.
Assuming ST 2110 is "just IP." ST 2110 is an uncompressed, real-time protocol with stringent latency and jitter requirements. Standard office network practices (DHCP, dynamic routing, oversubscribed uplinks) break it. Design ST 2110 networks like baseband—with deterministic switching and reserved bandwidth.