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Netgear GS110TPP

The GS110TPP is a 10-port managed gigabit switch. Eight ports support PoE+, with a standard total power budget of 120W.

The device's main CPU is RTL8380-based, likely a RTL8381M. To access the CPU's serial console on UART0, header J1 is available with 3.3V logic, 115200 baud, and 8n1 bits.

Ethernet ports are split up between the SoC's internal switch and an external RTL8214C phy. The internal switch connects to port 1-8, while the external phy connects to port 9-10. The external phy is linked to the SoC via a QSMII link. Ports 1-8 can also provide power according to 802.3.at (PoE+) and PoE is controlled by the BCM59121. PoE management is done by an auxiliary Nuvoton M0516LDN microcontroller. Communication with the Poe-CPU happens via a serial port, connected to the main CPU's UART1. Optocouplers are used to isolate the two circuits from each other and the communication frames can be sniffed from J3 (3.3V, 19200 baud, 8n1).

All ports have a two-pin bi-color LED, used to indicate the link status: green for 1000M, orange for 100M. These are driven by three SN74HC164 shift registers, using 20 of the 24 outputs available. PoE status bi-color LEDs are also available, with green used to indicate the remote device is PoE powered, and orange to signal a PoE fault status. The PoE-status LED are driven by two SN74LV595A shift registers.

Extra GPIOs are provided by an external RTL8231, as is common on this platform.

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  • Last modified: 2020/09/01 11:20
  • by svanheule