Zyxel GS1920 series
The GS1920 series is a line of managed gigabit ethernet switches. Two revisions exist, but both are built with Realtek hardware.
| Switch name | RJ45 ports | Combo SFP ports | Dedicated SFP ports | PoE ports | SoC |
|---|---|---|---|---|---|
| GS1920-24 | 28 | 4 | - | - | RTL8392M |
| GS1920-24HP | 28 | 4 | - | 24 | RTL8392M |
| GS1920-48 | 48 | 4 | 2 | - | RTL8393M |
| GS1920-48HP | 48 | 4 | 2 | 48 | RTL8393M |
| GS1920-8HPv2 | 10 | 2 | - | 8 | RTL8391M |
| GS1920-24v2 | 28 | 4 | - | - | RTL8391M |
| GS1920-24HPv2 | 28 | 4 | - | 24 | RTL8391M |
| GS1920-48v2 | 48 | 4 | 2 | - | RTL8393M |
| GS1920-48HPv2 | 48 | 4 | 2 | 48 | RTL8393M |
Models
GS1920-24HP
Hardware
- SoC: RTL839x
- Ethernet:
- 3× RTL8218 (to be confirmed)
- 1× RTL???? (combo ports)
- RAM: Nanya NT5CB64M16FP-DH, 128MiB DDR3
- Flash: Macronix MX25L1283F, 16MiB SPI NOR
- PoE controller: STM32F100
- PoE PSE: 6× BCM59111
- GPIO:
- 1× RTL8231 as GPIO expander: MII mode, device address 0x3
- 3× RTL8231 as shift register: port status LEDs
- HC164 shift register for device status LEDs
- ADT7468 (I2C/SMBus) thermal controller with 3× 3-pin fan
- Sipex SP3232 RS-232 transceiver
The serial port header J2 uses the standard DCE pinout, with TX/RX on pins 2 and 3, and ground on pin 5. Port settings are 9600 baud, 8n1, with ±5.6V logic levels.
The PoE management MCU and the ADT7468 fan controller are on a shared I2C bus. The PoE MCU is at address 0x20, while the fan controller is at (fixed) address 0x2E.
Photos
| Board | Pictures |
|---|---|
| Overview |   |
| Main board |       |
| PoE daughter board |    |