The GS1900-48 is a 48 + 2-port Gigabit L2 switch with 48 gigabit ports. 2 Uplink ports are SFP cages which support 1000 Base-X tmini GBIC modules. It has an RTL8393M SoC with 2 built-in SerDes for SFP. There are 6 RTL8218B PHYs and two RTL8231 GPIO extenders to control the port LEDs, system LED and reset button. 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. To connect to that UART, wires can be soldered to R603 and R602.

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.

There is experimental hardware support for the device in OpenWRT. SFP does not work.

• Product datasheet