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A cable modem is a type of modem that provides access to a data signal sent over the cable television infrastructure. Cable modems are primarily used to deliver broadband Internet access in the form of cable internet, taking advantage of the high bandwidth of a cable television network. They are commonly found in Australia, New Zealand, Canada, Europe, Costa Rica, and the United States. In the USA alone there were 22.5 million cable modem users during the first quarter of 2005, up from 17.4 million in the first quarter of 2004.

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Wikipedia About Cable Modems

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A cable modem is a type of modem that provides access to a data signal sent over the cable television infrastructure. Cable modems are primarily used to deliver broadband Internet access in the form of cable internet, taking advantage of the high bandwidth of a cable television network. They are commonly found in Australia, New Zealand, Canada, Europe, Costa Rica, and the United States. In the USA alone there were 22.5 million cable modem users during the first quarter of 2005, up from 17.4 million in the first quarter of 2004.

Cable modems in the OSI model or TCP/IP model

In network topology, a cable modem is a network bridge that conforms to IEEE 802.1D for Ethernet networking (with some modifications). The cable modem bridges Ethernet frames between a customer LAN and the coax cable network.

With respect to the OSI model, a cable modem is a data link layer (or layer 2) forwarder, rather than simply a modem.

A cable modem does support functionalities at other layers. In physical layer (or layer 1), the cable modem supports the Ethernet PHY on its LAN interface, and a DOCSIS defined cable-specific PHY on its HFC cable interface. It is to this cable-specific PHY that the name cable modem refers. In the network layer (or layer 3), the cable modem is a IP host in that it has its own IP address used by the network operator to manage and troubleshoot the device. In the transport layer (or layer 4) the cable modem supports UDP in association with its own IP address, and it supports filtering based on TCP and UDP port numbers to, for example, block forwarding of NetBIOS traffic out of the customer's LAN. In the application layer (layer 5 or layer 7), the cable modem supports certain protocols that are used for management and maintenance, notably DHCP, SNMP, and TFTP.

Some cable modem devices may incorporate a router along with the cable modem functionality, to provide the LAN with its own IP network addressing. From a data forwarding and network topology perspective, this router functionality is typically kept distinct from the cable modem functionality (at least logically) even though the two may share a single enclosure and appear as one unit. So, the cable modem function will have its own IP address and MAC address as will the router.

Hybrid Networks

Hybrid Networks developed, demonstrated and patented the first high speed, asymmetrical cable modem systems in 1990. A key Hybrid Networks insight was that highly asymmetrical communications would be sufficient to satisfy consumers connected remotely to an otherwise completely symmetric high speed data communications network. This was important because it was very expensive to provide high speed in the upstream direction, while the CATV systems already had substantial broadband capacity in the downstream direction. Also key was that it saw that the upstream and downstream communications could be on the same or different communications media using different protocols working in each direction to establish a closed loop communications system. The speeds and protocols used in each direction would be very different. The earliest systems used the public switched telephone network (PSTN) for the return path since very few cable systems were bi-directional. Later systems used cable for the upstream as well as the downstream path.

Search results for Cable Modems

How Cable Modems Work - HowStuffWorks

Introduction to how cable television channels and the Internet can flow over a single coaxial cable into your home.www.howstuffworks.com/cable-modem.htm

cable modem: Definition from Answers.com

cable modem ( ¦kābəl ¦mō′dem ) ( electricity ) A device that converts the signals used in a computer to ... Cable modems in the OSI model or TCP/IP model ...www.answers.com/topic/cable-modem

Howstuffworks "How Cable Modems Work"

Learn about cable modem technology, read cable modem reviews and compare prices and features ... Inside the Cable Modem. Cable modems can be either internal or ...computer.howstuffworks.com/cable-modem.htm/printable

Cable Digital News - Broadband, Communications & Entertainment Business ...

... loop carriers / multiservice access nodes (354), Cable modem termination systems ... Cable Modems (350), Cable/MSO equipment (2622), CableLabs (262), Compression ...www.lightreading.com/cdn/

DSL vs Cable modem

However, cable modems incorporate more functionality suitable for today's high ... Cable modems can be part modem, part tuner, part encryption/decryption device, ...www.cs.ndsu.nodak.edu/~mrehman/mp/assignment2/cableanddsl.ht...

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News about Cable Modems

Motorola Announces Chicago WiMAX Network Meets Key Technology Milestones for XOHM(TM) Launch

Broadcast NewsroomCHICAGO , Oct. 1 /PRNewswire-FirstCall/ -- WiMAX World 2008 -- In advance of the planned commercial deployment of WiMAX technology in Chicago by Sprint's (NYSE: S) XOHM business unit, Motorola , Inc. (NYSE: MOT) today announced that its WiMAX infrastructure has passed network acceptance tests vital to the provision of mobile broadband service to Chicagoland residents and businesses.http://www.broadcastnewsroom.com/articles/viewarticle.jsp?id...

MOTOACTV(TM) W450 Now Available at T-Mobile USA: Hold on for the Ride

Broadcast NewsroomLIBERTYVILLE, Ill. , Oct. 1 /PRNewswire-FirstCall/ -- Motorola , Inc. (NYSE: MOT) today announced the sporty, yet refined MOTOACTV W450 is available exclusively from T-Mobile USA. Whether users are going for a run, hopping on their bikes or gearing up for a climb, this device is ready for the challenge(1).http://www.broadcastnewsroom.com/articles/viewarticle.jsp?id...

Motorola to Deploy WiMAX Network in Pakistan for wi-tribe

Broadcast NewsroomISLAMABAD, Pakistan, Oct. 1 /PRNewswire-FirstCall/ -- Motorola, Inc. (NYSE: MOT) today announced that it has signed a multi-year WiMAX contract with wi-tribe Pakistan limited, the all-new wireless broadband Internet provider to enter the country.http://www.broadcastnewsroom.com/articles/viewarticle.jsp?id...

Zacks Analyst Blog Highlights: El Paso Corp., CRA International, Inc., Broadcom Corp., Verizon Communications Inc. and ...

Centre Daily TimesZacks.com announces the list of stocks featured in the Analyst Blog. Every day the Zacks Equity Research analysts discuss the latest news and events impacting stocks and the financial markets. Stocks recently featured in the blog include: El Paso Corp. (NYSE: EP), CRA International, Inc. (Nasdaq: CRAI), Broadcom Corp. (Nasdaq: BRCM), Verizon Communications Inc. (NYSE: VZ) and Sprint Nextel Corp. ....http://www.centredaily.com/business/story/875101.html

1st WiMax Network Launched in Baltimore

ABC NewsSprint opens the country's first WiMax wireless network Monday.http://abcnews.go.com/Technology/SmartHome/wireStory?id=5908...

News about Cable Modems

Motorola Wins Dual Honors at WiMAX World 2008

Media NewslineOur portfolio includes communications infrastructure, enterprise mobility solutions, digital set-tops, cable modems, mobile devices and Bluetooth accessories. Motorola is committed to delivering next generation communication solutions to people ... http://www.medianewsline.com/news/139/ARTICLE/3021/2008-10-0...

MOTOACTV(TM) W450 Now Available at T-Mobile USA: Hold on for the Ride

Yahoo FinanceOur portfolio includes communications infrastructure, enterprise mobility solutions, digital set-tops, cable modems, mobile devices and Bluetooth accessories. Motorola is committed to delivering next generation communication solutions to people ... http://biz.yahoo.com/prnews/081006/ny36203.html?.v=2

Make a new connection

Financial TimesThese wireless modems let users connect both to the internet and to corporate IT systems over 3G cellular networks, even if no WiFi or Ethernet cable connection is available. But, as I have been discovering, a new class of devices, called 3G wireless ... http://www.ft.com/cms/s/0/6de9f6e8-9621-11dd-9dce-000077b076...

Give the Gift of Reliable Communication this Christmas with the ...

PR NewswireOur portfolio includes communications infrastructure, enterprise mobility solutions, digital set-tops, cable modems, mobile devices and Bluetooth accessories. Motorola is committed to delivering next generation communication solutions to people ... http://sev.prnewswire.com/telecommunications/20081007/CLTU02...

Video Player Help

KLAS-TVSome Cable/DSL modems that use Network Address Translation (NAT) to send the UDP packets, may not forward the packets properly, which can cause the repeated "buffering" stage. By disabling the UDP protocol, the Windows Media Player will ... http://www.klas-tv.com/Global/story.asp?S=1351087&nav=menu10...

Search results for Cable Modems

DOCSIS

An overview of the CableLabs DOCSIS project. ... The CableLabs® Certified™ Cable Modem project, also known as DOCSIS® (Data Over Cable Service Interface Specification), defines ... http://www.cablemodem.com/

Cable Modem Help - Cable Internet Deals

Cable Modem Help is a forum that helps you out with Cable problems. ... Do you have a problem with your modem or internet provider? Is something wrong and tech support is no help ... http://www.cablemodemhelp.com/

Cable-Modem.Net Forums

Get the latest cable modem information and answers to your questions about cable modems and high speed internet access.http://forums.cable-modem.net/

Cable Modem and Networking Basics - Cable-Modem.net

Understand the basics of cable modem technology and networks. Get the information you need at Cable-Modem.net.http://www.cable-modem.net/topics/cable_modem_primer.html

HowStuffWorks "How Cable Modems Work"

Learn about cable modem technology, read cable modem reviews and compare prices and features on popular modem models.http://computer.howstuffworks.com/cable-modem.htm
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Answers for Cable Modems

bigstringmailCan I connect two cable modems into two different cable outlets and use the internet on two computers?bigstringmailsure can!nornfv123When looking at cable modems, what are the possible differences between the two?nornfv123the KIf you have two cable modems, do you need a router for Comcast Internet?the KSnowmanIs it possible to clone the mac address on a cable modem ,so that I can run 2 same cable modems on 1 accountSnowmanIf it were that easy we'd all do it! Two Identical macs will just not work period. The mac is a hardware identification for the system if it sees two identical ones it will just not respond to either...EricCan I hook up 2 cable modems to one connection without router?EricUnfortunately, it looks like you'll have to bite the bullet on this one. 300' is a long way for a Wireless connection anyway (it is almost the maximum length for an ethernet cable!), especially in doo...
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