Beijing Unicom's "changing copper for light and slimming the network" refers to upgrading the old broadband communication lines, that is, replacing copper lines with optical fiber lines. At present, the upgrading of old communication lines in the city has started, and all existing communication cables will be replaced with optical fibers. After the optical fiber upgrade, the fixed telephone, broadband and TV services will be upgraded in an all-round way, and you can experience better services.