This model is tricky to open as it has a total of seven plastic clips holding the top. You might need brute force, and there are >chances you will damage your case.
* Remove the screws under all four rubber feet
* For the front clips: using two flat head screw drivers push bottom “grill” out until you can lift the top slightly
* For the front side clips: using a flat head screw driver push the bottom out until it clicks (slide it in from the corner, then work yourself to where the clip is)
* For the back side clips: these should be easy now with some wiggling
→ port.serial general information about the serial port, serial port cable, etc.
The D-Link DSL-2640B E1 has an already exposed 4-pin serial port.
How to connect to the Serial Port of this specific device:
(PCB photo taken from DSL-2741B: the pins are at the same position)
Pin layout (from left):
Serial connection parameters
for D-Link DSL-2640B E1
→ port.jtag general information about the JTAG port, JTAG cable, etc.
How to connect to the JTAG Port of this specific device: