How cable modems work
| Added: 20-03-2010 Author: Brian Wilson Category: Wideband Internet |
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So you have a broadband connection at home/work and are wondering how it all works. Well I hope to explain to you how it works on a low-tech level so you will have a better understanding of how your connection works. Broadband services from cable companies or Multiple Service Operator s (MSO s) are normally provided via cable modems and 90% of the cable modems are using DOCSIS (Data over Cable Service Interface Specification). So let s now look at what DOCSIS is and what is means. DOCSIS defines interface requirements for cable modems involved in high-speed data distribution over cable television system networks (definition from cablelabs.com). With DOCSIS comes the different versions (1.0, 1.1, 2.0, & soon 3.0) and the limits for each version. We are not too worried with the versions and limits between the versions as consumers since we just want speed and security. But the important thing about DOCSIS is that it s a standard that protects the consumer and vendors by forcing interoperability and keep the cost of equipment down. If the modems where proprietary then the consumers would have to pay a very high price for the modem or would be force to lease them from the MSO s. Most MSO s will allow you to use just about any cable modem that is DOCSIS certified. Now not all MSO s will do this since they have to support all the modems on the plant with firmware upgrades and other issue with support but most of your well known modems should be supported.
Now CMTS & node
Cable modems communicate with a device called a cable modem termination system (CMTS). CMTS is a router that spoke all the way cable modem and there is traffic or for Mos's Internet backbone. There are several different vendors CMTS market but is best known for Cisco Systems. Cable mode usually in groups of regional lymph nodes. A node most likely you Subdivision but may or regions, and small stocks using margin to help all services. Mos RF fiber node converter that lets you send the matter to the region through the fiber in your area know about local services and the services they delivered more persuasive. Node size and number of clients in Modem node can make a difference in the speed of your broadband modem. Cable modem with the local node is a point and you get more users in the bandwidth available to all. Mso more joining nodes, but try to ensure there are always 50% available bandwidth at peak hours. Does this mean that if you carry the load at each node and download the service files that can reduce the number. And how competitive the ISP business mso node will try to not on the register and left much to add more nodes or separation.
Security on the Web
Other things to look out for security is the node. Make sure your other customers in the node can not see your computer and traffic. Security problems are usually handled and encryption modems to the CMTS traffic. Many ISPs use BPI + encryption to protect your traffic but you should always use the equipment Firewall / router from any broadband. To test the node network security you can open the window and see you to see where is not known if any shares are listed. If there is no encryption on the same subnet node again and you may be able to see other users sharing the network. This is bad if you have photos or other sensitive data you do not want others to see. Another thing to note is that many fonts that will block the network port of your computer. This is for all, no business purposes and your protection. Font size of the block NetBIOS, SMTP, port 80, and many other ports virus (trading account may port filters). Port is done to prevent further protect customers from viruses and worms that moved quickly through broadband.
Signal Level, and Splitters
Now let us look at the signal level required to maintain the cable modem and surf online. Many different signal cable modem that they need to contact the CMTS. Signal level can vary from vendor to vendor but as a rule 10dbv modem works better than the 10-RX and TX for 40dbv WWW 56dbv. Modem many vendors provide diagnostic cooperation web page or pages you can join in too Modem we see a message from the modem and standards. Page cooperation diagnostic IP is different but as a Modem Modem Modem specifications you lookup your vendors as you see the modem has a collaboration this diagnostic is not available. Other things to remember is that you must coax cable modem cable line inspection of his own from outside the box or from the main feed to get the margin. This is not a good idea to line your modem to persuade many splitters from the splitter has at least every 3.5 dbv or losses. And if you use a splitter, make sure to read the ratings throughput splitter must pass though at least 5-1,000 MHz. I hope that this basic cable modems seem to have helped you understand how Al-job and if you want to know more information about DOCSIS, CMTS's, cable modem, or try to use Google.
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