I’m not usually nostalgic, but I love everything about that phone line simulator. The case, the dip switches, the font, the model number DLE-200B. Brings back memories of a time long past.
I was really hoping to find an ISDN simulator with U-interfaces but anything I could find on eBay I wasn’t going to pay for since I had no documentation on how to configure/operate them.
I’d try to make one myself if I wasn’t so good at killing hardware.