combined mobile and fiber-optic Internet package (NTT Docomo)
Service-specific term used by NTT Docomo for a bundled plan that includes both a mobile phone line and a fiber-optic home Internet connection.
ドコモのペア回線に申し込むと、スマホと光回線のセット割が適用されます。
If you sign up for Docomo's Pair Kaisen, you get a bundle discount on your smartphone and fiber-optic line.
Compound of ペア (pair) and 回線 (line/circuit), referring to the pairing of mobile and fixed-line services.