Kramer EXT3-21-XR-TR
The Kramer EXT3-21-XR-TR has 11 inputs and 3 outputs: 4 × USB 3.2 Gen 2 (10G), 2 × HDMI, 1 × 48V DC, 1 × Balanced Audio.
Inputs and outputs
USB 3.2 Gen 2 (10G) (4)
| Port | Direction | Connector |
|---|
| USB 3.2 Host | In/out | USB-B |
| USB 3.2 Device 1 | In/out | USB-A |
| USB 3.2 Device 2 | In/out | USB-A |
| USB 3.2 Device 3 | In/out | USB-A |
HDMI (2)
| Port | Direction | Connector |
|---|
| HDMI In | In | HDMI |
| HDMI Out / TX Loop | Out | HDMI |
48V DC (1)
| Port | Direction | Connector |
|---|
| 48V DC In | In | – |
Balanced Audio (1)
| Port | Direction | Connector |
|---|
| Balanced Audio Out | Out | Phoenix |
Contact Closure (1)
| Port | Direction | Connector |
|---|
| Relays | Out | 4-Pole Terminal |
Ethernet (1)
| Port | Direction | Connector |
|---|
| LAN (PoE) | In/out | RJ45 |
GPIO (1)
| Port | Direction | Connector |
|---|
| GPIO | In/out | 2-Pole Terminal |
HDBaseT (1)
| Port | Direction | Connector |
|---|
| HDBaseT | In/out | RJ45 |
IR (1)
| Port | Direction | Connector |
|---|
| IR | In/out | 3.5mm TRS |
RS-232 (1)
| Port | Direction | Connector |
|---|
| RS-232 | In/out | Phoenix |
What it connects to
- Balanced Audio out: 1,171 devices in the library take it as an input.
- HDMI in: 610 devices in the library can feed it.
- HDBaseT in: 499 devices in the library can feed it.
- Ethernet in: 499 devices in the library can feed it.
- USB 3.2 Gen 2 (10G) in: 430 devices in the library can feed it.
- HDMI out: 415 devices in the library take it as an input.
Use the Kramer EXT3-21-XR-TR in a diagram
Add it from the library with these ports, connect it, and Patchify numbers the cables and builds the schedule, labels and rack.
Start your free trial30-day free trial. No credit card needed.
Port data from the Patchify gear library, last updated 9 October 2026. Report a correction