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Zyxel GS1900-48
The GS1900-48 is a 48 + 2-port Gigabit L2 switch with 48 gigabit ports.
Hardware
- RTL8393M SoC
- Macronix MX25l12805D (16MB flash)
- 128MB RAM
- 6 * RTL8218B external PHY
- 2 * RTL8231 GPIO extenders to control the port LEDs, system LED and reset button
2 Uplink ports are SFP cages which support 1000 Base-X tmini GBIC modules.
Power is supplied via a 230 volt mains connector. The board has a hard reset switch SW1, which is is not reachable from the outside. J4 provides a 12V RS232 serial connector which is connected through U8 to the 3.3V UART of the RTL8393. Conversion is done by U8, a SIPEX 3232EC. To connect to the UART, wires can be soldered to R603 and R602.
SDA of the left SFP cage is connected to gpio 26 of the closeby RTL8231, SCL to 24. For the right cage, SDA is GPIO30 and SCL is 31.
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.
OpenWRT Support
There is experimental hardware support for the device in OpenWRT. SFP does not work.