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59 lines
1.7 KiB
Markdown
59 lines
1.7 KiB
Markdown
# Hisource Hi-KO4022WS
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Following is documentation for unmanaged switch marked as `Hi-KO4022WS` .
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Original software is running UART on 9600 baud rate.
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Using SPI clamp in-board is the only method for initial installation.
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The board has two flash chips `BY25Q16BS` with 16M-bit size. The front switch, switches between the two flash chips.
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These can be programed independently by using said switch - so it is e.g. possible to run the original and new firmware in parallel.
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### Label specifications
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- **Name**: 2.5G Ethernet Switch
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- **Model**: Hi-KO4022WS
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- **Ports**:
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- 4 × RJ45: 10/100/1000/2500 Mbps
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- 2 × SFP: 1000 / 2500 / 10000 Mbps
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### What works (expected from label + similar devices)
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- All four 2.5GBASE-T RJ45 ports at 10/100/1000/2500 Mbps
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- Both SFP ports supporting 1G, 2.5G and 10G modules
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- LEDs
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### PCB overview
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**Board markings**
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- Top silkscreen: PCB-KO4022W-V3.0 / DIP-KO4022WS-V3.0
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Top side
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<img src="photos/K0402W-V3.0-unmanaged\PCB-top.jpg" width="300" />
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Bottom
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<img src="photos/K0402W-V3.0-unmanaged\PCB-bottom.jpg" width="300" />
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### T2, serial console
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| `J2` pin | Signal |
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| -------- | ----------- |
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| 1 | 3V3 |
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| 2 | RX (Input) |
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| 3 | TX (Output) |
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| 4 | GND |
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## Power supply
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Input power is delivered via barell plug, `12V 1A` adapter was provided.
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Board has two supply rails. `0.95` and `3.3` volt.
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### `0.95` Core Voltage
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Voltage is made by a `Techcode TD1720` .
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### `3.3` Voltage
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Voltage is created by chip marked as `Techcode TD1720`.
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There seems to have been a miscalculation when choosing the inductor and the device is ~25% more efficient with an 5V power supply. |