CD-321EA-PRO

The Superio CD-321EA-PRO is a USB-C docking station designed for meeting rooms, classrooms and professional AV workstations that require clean, reliable multi-display connectivity from a single cable. It consolidates dual independent 4K video outputs, wired network, USB peripherals, audio and laptop charging into one connection. Targeted at AV integrators and IT installers, it ships complete with a mains power supply and requires no additional drivers under Windows or macOS — making it straightforward to deploy in managed environments where standardisation and low support overhead matter.

Dual Independent 4K60 Displays via MST

The CD-321EA-PRO uses DisplayPort 1.4a with DSC (Display Stream Compression) over the USB-C connection to drive two HDMI 2.0 outputs simultaneously in MST (Multi-Stream Transport) mode under Windows. Each output supports up to 3840 × 2160 at 60 Hz with 4:4:4 chroma and 8-bit colour — matching the full bandwidth ceiling of HDMI 2.0. HDR10 and HDCP 2.2 (backwards-compatible to HDCP 1.4) are also supported. In macOS, the dock operates in SST mode, providing a mirrored or extended single-stream signal; two fully independent images are a Windows-only capability. For installers, this means verifying the host laptop supports DisplayPort Alt Mode before specifying the dock — a check that should be part of any site survey.

Fixed EDID Lock for Reliable Display Negotiation

A selectable fixed-EDID mode outputs a static 1080p-60 Hz / 2-channel audio EDID to connected displays regardless of what the monitors actually report back to the host. In multi-display meeting rooms and AV racks, display negotiation failures are a common source of intermittent black screens or audio drop-outs — particularly when displays are powered off out of sequence or swapped. Forcing a known-good EDID removes this variable entirely, so the laptop boots straight into the correct resolution without user intervention. For installers, this significantly reduces on-site troubleshooting and call-backs, especially in fixed installations where the display configuration never changes.

One USB-C cable. Two 4K screens. Full room connectivity.

Includes mains power supply · 36-month warranty

100 W USB Power Delivery with Selectable USB Port Power

USB PD 3.0 supplies up to 100 W to the host laptop, depending on the included power supply and system load. When all three USB peripheral ports are simultaneously loaded at 5 V / 3 A (a total 15 W peripheral draw), 80 W remains available for laptop charging — enough to sustain or actively charge most business laptops during heavy use. A configurable USB power mode adds a practical installation benefit: in AUTO mode, the downstream USB ports follow the laptop's power state; in ON mode, they remain energised as long as the dock has mains power. The ON setting is useful for installations where USB peripherals such as room cameras, speakerphones or occupancy sensors must stay active even when the room PC goes to standby.

Integrated Gigabit Ethernet and Audio Outputs

A 10/100/1000 Mbit/s Ethernet port provides full-speed wired network access — critical in meeting rooms and classrooms where Wi-Fi congestion or corporate network policies mandate a wired connection for video conferencing. Alongside network, the dock extracts audio from the USB-C / DisplayPort signal and routes it to a 3.5 mm analogue stereo jack and a digital S/PDIF output, with resolution up to 24 bit / 192 kHz. Volume is controlled from the host operating system. This means a room speakerphone or a small analogue amplifier can be connected directly to the dock without an additional USB audio adapter, reducing the cable count at the table.