Small Meeting Rooms Don't Need a Separate Audio or Control Processor
In a small meeting room, a presentation switcher with a built-in audio matrix and display control can replace the separate DSP and control processor.
Stop sizing the job to a matrix frame
When a job has several sources and several displays, many integrators still start with an HDMI matrix switcher. Count the inputs, count the outputs, pick the next frame size up, and home-run everything back to the rack. It is a familiar way to work, and it seems safe because the matrix is a known box with a known port count.
Our position is that for multi-room routing, KVM stations and video walls, you should spec uncompressed AV over IP on a 10G managed network instead of a fixed matrix. The matrix fixes the size of the system on the day you order it. Every source and every display has to be cabled back to one chassis, so the room layout follows the rack and not the other way round. When the client adds a display, a second wall or a new workstation, you are either out of ports or swapping the frame.
The usual reason for sticking with a matrix is that AV over IP adds lag and softens the picture. That is true of compressed systems. Uncompressed systems don't have that problem, and that is the point of this post.
Why the network is the better matrix
In an AV over IP system the switching happens in a network switch. Each source gets an encoder and each display gets a decoder, and any encoder can be routed to any decoder. Adding an endpoint means adding a box and a switch port, not replacing a chassis. Endpoints only need to reach the switch, not a central AV rack, so cable runs follow the building.
The lag and picture-quality objections come from compression. A codec has to buffer frames to compress them, which adds delay and can leave artifacts. An uncompressed stream skips the codec entirely, so the picture leaves the decoder as it entered the encoder. The trade-off is bandwidth: uncompressed 4K60 4:4:4 needs a 10G managed switch, not a 1G office switch. That network needs planning, but it is planning you would otherwise spend on cable runs to a matrix.
The evidence: one transceiver, either end of the link
The AVO-IPSDV-4K, coming soon, is an SDVoE transceiver built for this kind of system. Its specification lists 4K@60Hz 4:4:4 uncompressed as the maximum resolution, with HDMI 2.0b, HDCP 2.2 and 18Gbps video bandwidth over a 10G network. Latency is listed as a zero-frame latency operating mode. Switching is seamless, with no black screen, tearing or interruption, so routing feels like a matrix to the operator.
The same box can work as an encoder or a decoder. To change modes, hold the front-panel MODE button for 5 seconds, or set the mode through the API or the AVO-IPCTL-SDV controller. That matters for the habit we are arguing against. You don't need to pre-count encoders and decoders the way you pre-count matrix inputs and outputs. One spare unit covers either end of a link.
It also handles more than video routing:
- Video wall and multiview: up to 9×9 (81 displays) and up to 25 multiview windows, configured from the controller.
- KVM: USB 2.0 HOST (Type B) on the encoder and two USB 2.0 DEVICE (Type A) ports on the decoder for keyboard, mouse or U Disk.
- Control: bidirectional IR, RS-232 and CEC routing, with control by IR, RS-232, TCP/IP and web GUI.
- Audio: full HDMI audio including Dolby TrueHD, Dolby Atmos and DTS:X, plus bidirectional 3.5mm stereo analog audio between encoder and decoder.
- Connections: both the 10G BASE-T copper port and the 10G SFP+ fiber port are active, and you can set which one has priority. A separate 1G LAN port carries an H.264/H.265 preview stream with VLAN tagging.
- Local monitor: in encoder mode, HDMI loop out feeds a monitor at the source.
When a matrix is still the right call
A fixed HDMI matrix is still a reasonable choice in some cases:
- Small rooms that won't grow: every source and display sits close to one rack, and the client has no plans to expand.
- No suitable network: the site can't provide or accept a dedicated 10G managed switch, and the IT department won't allow multicast traffic on its network. This system depends on that switch. Compressed AV over IP runs on 1G switches, but it trades away the zero-frame latency that makes this argument work.
- Equipment needed now: this unit is coming soon and is not shipping yet, so a job that needs hardware immediately has to be planned around what is available.
What to check before you specify
- Copper runs: the specification rates transmission distance by cable type only, at 100m on CAT6A/7 and 90m on CAT6, and does not tie those figures to a particular resolution.
- Fiber: the SFP+ module is sold separately. Choose single-mode or multi-mode to suit the run.
- Switch: a 10G managed switch (Layer 2/Layer 3) with IGMP Snooping enabled and unregistered multicast filtered or dropped. Jumbo frames are recommended. All transceivers and the controller connect to the same 10G switch.
- The 1G LAN port: connect it to a separate 1G network for the preview stream. Never connect it to the 10G SDVoE switch port.
- HDMI leads: Premium High Speed HDMI cable is required for 4K60 signals. Keep the leads between source, transceiver and display short, and check the maximum HDMI cable lengths in the user manual before you fix rack and display positions.
- Power: PoE 802.3at PD or DC 12V/2.5A locking adapter (included), about 13.5W per unit. Budget PoE on the switch if you use it.
- Controller: the AVO-IPCTL-SDV / CTL100D is sold separately and handles matrix routing, video wall setup, multiview, KVM and mode assignments.
- Rack and environment: up to 10 units in a 6U rack or 4 in a 1U rack. Operating temperature is 32–104°F (0–40°C).
Questions integrators ask
Can an AV over IP encoder really replace a matrix switcher?
Yes, with a controller. The AVO-IPCTL-SDV handles matrix routing across all transceivers on the 10G switch, with seamless switching and zero-frame latency. Video wall and multiview layouts come from the same controller, which a fixed matrix can't do.
Do I need to order separate encoders and decoders?
No. Each AVO-IPSDV-4K can be set as either one. Hold MODE for 5 seconds, or set the mode from the API or controller without touching the unit. The ENC/DEC LED flashes for about 30 seconds during the change and then stays lit to confirm the new mode.
Is this a simple way to build a KVM setup?
It is plug-in KVM once the network is set up. Connect the PC to the USB HOST (Type B) port on the encoder and plug the keyboard and mouse into the decoder's two USB DEVICE ports. The controller manages KVM assignments. The network itself still needs the 10G managed switch settings listed above.
Why won't my existing 1G switch work?
Uncompressed 4K60 4:4:4 needs about 18Gbps of video bandwidth per stream, which is far more than 1G can carry. SDVoE streams require a 10G managed switch. Only the separate 1G LAN preview port belongs on a 1G network.
Can I mix copper and fiber endpoints?
Yes. Both the 10G BASE-T and 10G SFP+ ports are active at the same time, with priority set from the controller or web GUI. Copper and fiber endpoints can share the same 10G switch.
