How does a cable modem work?
Cable modems operate as their name suggests, by Modulating and Demodulating cable transmission signals. The CNS state-of-the-art headend unit receives the high-bandwidth data from the Internet and transfers it to your home or business. Your cable modem receives the high-speed data, and the Ethernet card translates the data to your computer. The fact that the word “modem” is used to describe this device can be a little misleading, only in that it conjures up images of a typical telephone dial-up modem. Yes, it is a modem in the true sense of the word – it Modulates and Demodulates signals. But the similarity ends there because cable modems are far more complicated than their telephone counterparts. Cable modems can be part modem, part tuner, part encryption/decryption device, part bridge, part router, part NIC card, part SNMP agent, and part Ethernet hub.
Cable modems modulate and demodulate RF signals. The cable modem receives data in what is known as the downstream signal. This signal is modulated on television channels that are six MHz wide at frequencies between 88 to 860 MHz. if (ng5) { var lyr = document.getElementById(‘div11’); lyr.style.display = “none”; } else if (ns4) { var lyr = document.layers[‘div11’]; lyr.visibility = “hidden”; } else if (ie4){ var lyr = document.all[‘div11’]; lyr.style.
