Zyxel GS1900-48HP

The GS1900-48HP is a 48-port managed Gigabit switch, of which 24 ports are PoE-capable.


Main board

  • RTL8393M SoC
  • SK hynix H5TQ1G63EFR (128MB DDR3 SDRAM)
  • Macronix MX25L12805D (16MB flash)
  • Sipex 3232EC RS232 level converter
  • 6 x RTL8218B PHY
  • 2 x RTL8231 GPIO extender

PoE board

  • PoE controller: STM32F100
  • PSE: 6 x Broadcom BCM59111

Serial port

The RS232 serial port is available on header J4, which matches a standard IDC10 pinout:

  • J4.2: RX
  • J4.3: TX
  • J4.5: GND

A system reset switch (SW1) is reachable through a vent hole.

Board Pictures

Board Pictures
Full board setup
Main board
PoE board


  • gs1900-48hp.txt
  • Last modified: 2022/04/18 15:17
  • by svanheule