Cables made of optical fibers are currently the main tool for signal transmission. 光纖電纜是目前主要的信號傳輸工具。
Every fiber-optic cable used for networking consists of two glass fibers encased in separate sheaths. 使用來(lái)連網(wǎng)的每個(gè)光纖電纜是由包裝在分開(kāi)的保護套內的二條玻璃纖維組成。