Netgear GS310TPv1

The GS310TPv1 is a 8 + 2-port Gigabit L2 switch with up to 55 Watts of PoE+ power on the 8 Gigabit ports. It is part of the Netgear S350 Series.

  • Winbond W25Q256JVFQ (32MB flash)
  • Winbond W631GG8MB (128MB DDR3 SDRAM)
  • RTL8231 GPIO extender to control the port LEDs, system LED and a reset button.
  • Nuvoton ARM microcontroller
  • Broadcom BCM59121B0KMLG PoE controller

Power is supplied via a 54V 1.25A barrel connector.

A Serial header is found at J1. Pins are Vcc(3.3V, Square), TX, RX and GND. Serial connection is via 115200 baud, 8N1.

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).

To indicate the global device status, two LEDs are present on the front panel. One is labelled 'PoE Max', and is likely controlled directly by the PoE MCU. The other is labeled 'Power', and is used to indicate the device status. This LED appears to be an RGB LED, although it is currently unclear how the three colours are controlled. 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 LEDs are driven by two SN74LV595A shift registers, also controlled by the PoE MCU.

There is also a SN74LVC125A four-port tri-state buffer whose purpose is currently unknown.

GS310TPv1

Serial console

  • J1.1: 3.3V via R9 (not populated)
  • J1.2: RX
  • J1.3: TX
  • J1.4: GND

Serial PoE control

This connector is in the PoE power domain, which is isolated from the power domain of the SoC. Be careful when connecting to this port and use a digital isolator.

  • J3.1: VCC (appears not connected)
  • J3.2: RX
  • J3.3: TX
  • J3.4: GND

The switch ships with a bootloader based on Realtek's SDK for RTL83xx SoCs and Linux based on Realtek's SDK. It has a web interface for basic management, including firmware updates. The board identifies as RTL8393M_DEMO. But this is misleading. The SoC chip id is 83806800, which is RTL8380M_CHIP_ID according to sdk/include/hal/chipdef/chip.h in Realtek's SDK.

Flash layout
Name u-boot u-boot-env device-info config log firmware1 firmware2
Size 896k 64k 64k 1M 1M 14.5M 14.5M
------------------ Board Configuration ------------------

***********************************************************
 S350 Series 8-Port Gigabit PoE+ Ethernet Smart Managed Pro Switch with 2 SFP Ports
***********************************************************
============================
 Board GPIO
============================
Device  Pin  Direction  Default  Current
------- ---- ---------- -------- --------
EXT     31   OUT (OUT ) 1        0       
EXT     32   OUT (OUT ) 0        1       
EXT     35   OUT (OUT ) 1        1       
EXT     33   OUT (OUT ) 0        0       
EXT     34   OUT (OUT ) 1        1       
EXT     24   OUT (OUT ) 1        1       
INT     0    IN         0        1       
EXT     20   OUT (OUT ) 1        1       
INT     13   OUT        1        1       
EXT     25   OUT (OUT ) 1        1       
EXT     10   OUT (OUT ) 0        1       
EXT     7    IN  (IN  ) 0        1       
EXT     6    IN  (IN  ) 0        1       
INT     16   IN         0        1       
INT     15   IN         0        0       
EXT     14   IN  (IN  ) 0        1       
EXT     13   IN  (IN  ) 0        1       
INT     18   IN         0        1       
INT     17   IN         0        1       
EXT     28   OUT (OUT ) 0        0       
EXT     27   OUT (OUT ) 0        1       
EXT     11   IN  (IN  ) 0        0       
EXT     11   IN  (IN  ) 0        0       
EXT     5    IN  (IN  ) 0        0       
EXT     4    IN  (IN  ) 0        0       
EXT     12   IN  (IN  ) 0        0       

============================
 Board Configuration
============================
====== Port ==================
Type        Usr  Phy     Media       Speed          Duplex   Attr
----------- ---- ------- ----------- -------------- -------- -------
1000M       1    (0) 8   Copper      (A) ALL        Auto     1      
1000M       2    (0) 9   Copper      (A) ALL        Auto     1      
1000M       3    (0) 10  Copper      (A) ALL        Auto     1      
1000M       4    (0) 11  Copper      (A) ALL        Auto     1      
1000M       5    (0) 12  Copper      (A) ALL        Auto     1      
1000M       6    (0) 13  Copper      (A) ALL        Auto     1      
1000M       7    (0) 14  Copper      (A) ALL        Auto     1      
1000M       8    (0) 15  Copper      (A) ALL        Auto     1      
1000M       9    (0) 24  Fiber       (A) ALL        Auto     0      
1000M       10   (0) 26  Fiber       (A) ALL        Auto     0      


====== Fiber =================
Fiber Port Number: 2

------------ Fiber Detect
LPort  Present  MediaChg  OE Status              LOS Status
------ -------- --------- ---------------------- ----------------------
8      OE       OE        Enabled  (GPIO:EXT_14) Enabled  (GPIO:EXT_7 )
9      OE       OE        Enabled  (GPIO:EXT_13) Enabled  (GPIO:EXT_6 )

------------ Fiber Optical
LPort  I2C DEV  I2C TYPE  ID    Delay   SCK    SDA
------ -------- --------- ----- ------- ------ ------
8      0        8 BITS    0x50  1000    EXT_36 EXT_28
9      1        8 BITS    0x50  1000    EXT_36 EXT_27

------------ Fiber TX Disable
LPort  Method
------ ------
8      GPIO(EXT_28)


====== Button ================

------------ Reset Button
GPIO: INT_0 
Timer: 3(sec)  Action: Reboot
Timer: 5(sec)  Action: Restore Factory


====== Led ===================
System (GPIO) GPIO: EXT_31
Alarm (GPIO) GPIO: EXT_32
Port Green (ASIC)Port Yellow (ASIC)

====== Reset =================
Type: GPIO
GPIO: INT_13


====== WatchDog ==============
Type: REG


====== PoE ===================


U-Boot is used as bootloader for this device, and has access to a modifiable u-boot-env partition. This can be used to store modified and custom environment variables.

Some realtek-specific commands are also available:

  • rtk network on: Configure the ethernet hardware inside the bootloader (not enabled on boot).
  • gs310tp.txt
  • Last modified: 2021/05/01 04:33
  • by raylynnknight