每日专业词汇2-Cable Modem

A cable modem is a peripheral device used to connect to the Internet. It operates over coax cable TV lines and provides high-speed Internet access. Since cable modems offer an always-on connection and fast data transfer rates, they are considered broadband devices.电缆调制解调器是用于连接到 Internet 的外围设备。它通过同轴有线电视线路运行，并提供高速互联网接入。由于电缆调制解调器提供始终在线的连接和快速的数据传输速率，因此它们被视为宽带设备。

Dial-up modems, which were popular in the early years of the Internet, offered speeds close to 56 Kbps over analog telephone lines. Eventually, DSL and cable modems replaced dial-up modems since they offered much faster speeds. Early cable modems provided download and upload speeds of 1 to 3 Mbps, 20 to 60 times faster than the fastest dial-up modems. Today, standard cable Internet access speeds range from 25 to 50 Mbps. On the high end, Comcast offers an "Xfinity Extreme" service with speeds up to 505 Mbps.拨号调制解调器在 Internet 的早期很流行，通过模拟电话线提供接近 56 Kbps 的速度。最终，DSL 和电缆调制解调器取代了拨号调制解调器，因为它们提供了更快的速度。早期的电缆调制解调器提供 1 到 3 Mbps 的下载和上传速度，比最快的拨号调制解调器快 20 到 60 倍。如今，标准的有线 Internet 访问速度从 25 Mbps 到 50 Mbps 不等。在高端，Comcast 提供速度高达 505 Mbps 的“Xfinity Extreme”服务。

Most cable modems include a standard RJ45 port that connects to the Ethernet port on your computer or router. Since most homes now have several Internet-enabled devices, cable modems are typically connected to a home router, allowing multiple devices to access the Internet. Some cable modems even include a built-in wireless router, eliminating the need for a second device.大多数电缆调制解调器都包含一个标准 RJ45 端口，该端口连接到计算机或路由器上的以太网端口。由于现在大多数家庭都有多个支持 Internet 的设备，因此电缆调制解调器通常连接到家庭路由器，从而允许多个设备访问 Internet。一些电缆调制解调器甚至包括一个内置的无线路由器，无需第二个设备。

NOTE: While "cable modem" includes the word "modem," it does not function as a traditional modem (which is short for "modulator/demodulator"). Cable modems send and receive information digitally, so there is no need to modulate an analog signal.注意：虽然“电缆调制解调器”包含“调制解调器”一词，但它不能用作传统调制解调器（“modulator/demodulator”的缩写）。电缆调制解调器以数字方式发送和接收信息，因此无需调制模拟信号。