Zyxel GS1900-24HP
The GS1900-24HP is a 24 + 2-port Gigabit L2 switch with up to 170 Watts of PoE power on the 24 Gigabit ports.
Hardware
- RTL8382M SoC
- Macronix MX25L12835FM2I (16MB flash)
- Winbond W9751G8KB (64MB DDR2 SDRAM)
- 2 x RTL8231 GPIO extenders to control the port LEDs, system LED and reset button
- ST-Micron 32F100 ARM microcontroller for SoC-PoE management
- 6 x Broadcom BCM59111 PoE controllers
2 Uplink ports are SFP cages which support 1000 Base-X tmini GBIC modules.
Power is supplied via a 100-240V C13 connector.
PoE is controlled by a Broadcom BCM59111 via a ST-Micron 32F100 ARM microcontroller, which in turn talks a serial protocol with the RTL8382M (19200 baud, 8N1). The exchange between the ARM microcontroller and the RTL SoC can be snooped by connecting a logic analyzer to pins 21 (PB10) and 22 (PB11) of the STM 32F100 in its LQFP48 package.
Board details
Firmware
It ships with a bootloader based on Realtek's SDK for RTL83xx SoCs and Linux 2.6 based on Realtek's SDK. It has a web interface for all management functions.