diff --git a/doc/devices/ZX310S-4T2XT.md b/doc/devices/ZX310S-4T2XT.md
new file mode 100644
index 0000000..956627f
--- /dev/null
+++ b/doc/devices/ZX310S-4T2XT.md
@@ -0,0 +1,53 @@
+# ZX310S-4T2XT
+
+The following is a documentation for the managed switch marked as
+`ZX310S-4T2XT` and sold by Horaco.
+
+The original software is running UART on 57600 baud rate 8N1.
+
+CPU: RTL8372
+Flash: 2MByte Winbond W25Q16DV (U3)
+PHY 2x RTL8261BE
+
+### Label specifications
+
+- **Name**:
+- **Ports**:
+  - 4 × RJ45: 10/100/1000/2500 Mbps
+  - 2 x RJ45: 10/100/1000/2500/5000/10000 Mbps
+- **Power**: 12V DC, 2A barrel connector
+
+<img src="photos/ZX310S-4T2XT/label.jpg" width="300" />
+
+### What works
+The device is fully supported:
+- All 4 2.5GBASE-T RJ45 ports work at 10/100/1000/2500 Mbps, including EEE
+- The 10GBit ports works, including EEE.
+- LEDs work with the same indiciations as the OEM firmware
+
+### PCB overview
+
+**Board markings**
+- Top silkscreen: PCB-SL310S-4T2XT-V1.0.0-22273
+
+Top side
+
+<img src="photos/ZX310S-4T2XT/pcb_top.jpg" width="300" />
+
+Bottom
+
+<img src="photos/ZX310S-4T2XT/pcb_bottom.jpg" width="300" />
+
+### J1, serial console
+
+| `J1` pin | Signal      |
+| -------- | ----------- |
+| 1        | TX (Output) |
+| 2        | RX (Input)  |
+| 3        | GND         |
+| 4        | 3V3         |
+
+
+## Power supply
+
+Input power is delivered via barell plug, `12V 2A` adapter was provided.
diff --git a/machine.c b/machine.c
index c7d369a..7d9f59c 100644
--- a/machine.c
+++ b/machine.c
@@ -1,6 +1,7 @@
 #include "machine.h"
 #include "rtl837x_pins.h"
 #include "rtl837x_leds.h"
+#include "rtl837x_sfr.h"
 #include "rtl837x_regs.h"
 #include "rtl837x_common.h"
 
@@ -843,7 +844,48 @@ void machine_custom_init(void)
     reg_bit_clear(RTL837X_REG_LED_MODE, 7);
 }
 
+#elif defined MACHINE_ZX310S_4T2XT
+__code const struct machine machine = {
+	.machine_name = "ZX310S_4T2XT",
+	.isRTL8373 = 0,
+	.min_port = 3,
+	.max_port = 8,
+	.n_sfp = 0,
+	.n_10g = 2,
+	.log_to_phys_port = {0, 0, 0, 5, 1, 2, 3, 4, 6},
+	.phys_to_log_port = {4, 5, 6, 7, 3, 8, 0, 0, 0},
+	.is_sfp = {0, 0, 0, 0, 0, 0, 0, 0, 0},
+	.reset_pin = GPIO48_I2C_SCL1,
+	.high_leds = { .mux = LED_28_SYS | LED_29, .enable = LED_27 | LED_28_SYS | LED_29 },
+	.led_mux_custom = 1,
+	.led_mux = { 0x00, 0x01, 0x04, 0x05, 0x08, // 65e0
+		     0x09, 0x0c, 0x3f, 0x0d, 0x10, // 65e4
+		     0x11, 0x0e, 0x14, 0x11, 0x12, // 65e8
+		     0x15, 0x15, 0x16, 0x18, 0x19, // 65ec
+		     0x1a, 0x19, 0x1d, 0x1e, 0x1c, // 65f0
+		     0x1d, 0x20, 0x21 },
+	.port_led_set = { 0, 0, 0, 1, 0, 0, 0, 0, 1},
+	/* Ports 1-4: Green: 2.5GBit, Orange: 10/100/1000MBit
+	 * Ports 5-6: Green: 10GBit, Orange: <= 5GBit
+	 */
+	.led_sets = { { LEDS_2G5 | LEDS_LINK | LEDS_ACT,
+			LEDS_1G | LEDS_100M | LEDS_10M | LEDS_LINK | LEDS_ACT,
+			LEDS_DUPLEX,
+			LEDS_2G5 | LEDS_LINK | LEDS_ACT },
+		      {
+			LEDS_2G5 | LEDS_1G | LEDS_100M | LEDS_LINK | LEDS_ACT,
+			LEDS_LINK | LEDS_ACT | LEDS_10G | LEDS_5G,
+			LEDS_2G5 | LEDS_LINK,
+			LEDS_COL | LEDS_DUPLEX
+		      }
+		    },
+};
 
+void machine_custom_init(void) {
+	// For this device, the reset value of RTL837X_PIN_MUX_0 is 0x30000000,
+	// which would disables all LEDS, enable them manually:
+	REG_SET(RTL837X_PIN_MUX_0, 0x30db68bf);
+}
 
 #else
 	#error "Please select a machine type in machine.h"
diff --git a/machine.h b/machine.h
index 1e4f574..584c488 100644
--- a/machine.h
+++ b/machine.h
@@ -22,6 +22,7 @@
 // #define MACHINE_K0501W_V2_0
 // #define MACHINE_LIANGUO_ZX_SWTGW215AS
 // #define MACHINE_ZX310S_4T2XH
+// #define MACHINE_ZX310S_4T2XT
 // #define MACHINE_DEFAULT_8C_1SFP
 // #define MACHINE_HI_K0801WS
 // #define MACHINE_FNS1200P