This is a modular cable from ARVEL (now Buffalo). ATLT-100FC Twisted pair Shielded Ferrite core 6-pin, 2-conductor Modular plug ←→ Modular plug Retail price: ¥1,500 I used this about 5 years ago when I lived in an old apartment, as it was necessary for the connection. I used it for about 2 years. It's 10m long, making it easy to handle. If anyone is interested in using it, please let me know. * Please note that the box will be folded for shipping due to its thickness.