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Encyclopedia > Cable modem
An outdated model of the Motorola Surfboard cable modem
An outdated model of the Motorola Surfboard cable modem

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, taking advantage of unused bandwidth on a cable television network. They are commonly found in Australia, Canada, Europe and USA. In USA alone there were 22.5 million cable modem users during Q1 2005, up from 17.4 million in Q1 2004. Image File history File links Derived from public domain images featured at: http://commons. ... A cable modem is a special type of modem that is designed to modulate a data signal over cable television infrastructure. ... ImageMetadata File history File links Download high resolution version (500x746, 77 KB) Cable modem for broadband internet Photographed in England by Adrian Pingstone in March 2004 and released to the public domain. ... ImageMetadata File history File links Download high resolution version (500x746, 77 KB) Cable modem for broadband internet Photographed in England by Adrian Pingstone in March 2004 and released to the public domain. ... For other uses, see Modem (disambiguation). ... Coaxial cable is often used to transmit cable television into the house. ... A WildBlue Satellite Internet dish. ... -1... For other uses, see Europe (disambiguation). ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ...

Contents

Cable internet access

The term cable Internet access refers to the delivery of Internet service over this infrastructure. Cable modems, along with DSL technology, are the two primary types of broadband Internet access. An Internet Service Provider (ISP) is a business or organization that offers users access to the Internet and related services. ... A DSL Modem DSL or xDSL, is a family of technologies that provide digital data transmission over the wires of a local telephone network. ... Broadband in telecommunications is a term that refers to a signaling method that includes or handles a relatively wide range of frequencies, which may be divided into channels or frequency bins. ...


Bit rate of business cable modem service typically range from 2 Megabits per second (Mbit/s) up to 50 Mbit/s or more. The upstream rate on residential cable modem service usually ranges from 384 Kilobits per second (kbit/s) to 20 Mbit/s or more. There are few attempts to offer different service tiers beyond the traditional 'home' and 'business' designations. The Megabit is a unit of information storage, abbreviated Mbit or sometimes Mb. ... A kilobit is a unit of information storage, abbreviated kbit or sometimes kb. ... Tiered services is business jargon for providing a service (such as telecom connectivity or cable channel service) according to separate, incrementally distinct quality and pay levels, or tiers. ...


There are two potential disadvantages to cable internet:

  1. Like all residential broadband network technologies (e.g. DSL, FTTX, Satellite internet, WiMAX), a fixed channel capacity is shared by a population of users (in the case of cable internet, users in a neighborhood share the available capacity provided by a single coaxial cable line). Therefore, service speed can vary depending on how many people are using the service at the same time. This arrangement allows the network operator to take advantage of statistical multiplexing in order to provide an adequate level of service at an acceptable price. However, the operator has to monitor usage patterns, and scale the network appropriately, to ensure that customers receive adequate service even during peak usage times. Some operators also use a bandwidth cap.
  2. Many cable Internet providers are reluctant to offer cable modem access without tying it to a cable television subscription. They do this by charging higher rates, say $60/month for cable modem only access, than if one bundles it with a cable TV plan where it might be $40/month for cable modem service plus $40/month for cable TV service. This has ramifications similar to those of the lack of naked DSL. Cable internet access providers who resell access from cable companies, such as Earthlink, are generally not subject to these higher rates. However, they can not give you internet access if you don't have cable service.

DSL may refer to: Damn Small Linux Dark and Shattered Lands, a MUD based loosely on Forgotten Realms and Dragonlance books. ... FTTx is an acronym for Fiber-to-the-x where x is a wildcard for H = Home, P = Premises, C = Curb. ... A Wild Blue Satellite Internet dish. ... Official WiMax logo WiMAX, the Worldwide Interoperability for Microwave Access, is a telecommunications technology aimed at providing wireless data over long distances in a variety of ways, from point-to-point links to full mobile cellular type access. ... Coaxial Cable For the weapon, see coaxial weapon. ... Statistical multiplexing is similar to time-division multiplexing (TDM), except that, rather than arbitrarily assigning a time slot to each signal, each signal is assigned a slot according to priority and need. ... Administered by an Internet service provider (ISP), a bandwidth cap or download cap limits the transfer of a specified amount of data over a period of time. ... Tying is the practice of making the sale of one good (the tying good) to the de facto or de jure customer conditional on the purchase of a second distinctive good (the tied good). ... A naked DSL (a. ... It has been suggested that this article be split into multiple articles accessible from a disambiguation page. ...

Cable modems in the OSI model or TCP/IP model

From a network topology perspective, a cable modem is, strictly speaking, 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. The Open Systems Interconnection Basic Reference Model (OSI Reference Model or OSI Model for short) is a layered, abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnection (OSI) initiative. ... The TCP/IP model or Internet reference model, sometimes called the DoD model (DoD, Department of Defense), ARPANET reference model, is a layered abstract description for communications and computer network protocol design. ... A network bridge connects multiple network segments at the data link layer (layer 2) of the OSI model. ... Links ANSI/IEEE Std 802. ... Ethernet is a large, diverse family of frame-based computer networking technologies that operate at many speeds for local area networks (LANs). ... Lan can stand for several things: A local area network Lan (airline) formerly LanChile Lan Peru Län, a kind of administrative division used in Sweden Lan Mandragoran, a fictional character in the Wheel of Time fantasy series by Robert Jordan. ...


With respect to the OSI model, a cable modem is thus a data link layer (or layer 2) forwarder, rather than simply a modem. The Open Systems Interconnection Basic Reference Model (OSI Reference Model or OSI Model for short) is a layered, abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnection (OSI) initiative. ... This article does not cite any references or sources. ... For other uses, see Modem (disambiguation). ...


A cable modem does however, also 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. This article does not cite any references or sources. ... Twisted-pair cable used with 10BASE-T 8P8C (not RJ-45) plug used with 10BASE-T There are several standards for Ethernet over twisted pair cable. ... In telecommunication and computer communication, the term network interface has the following meanings: The point of interconnection between a user terminal and a private or public network. ... Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ... Hybrid fiber-coaxial (HFC) is a telecommunications industry term for a network which incorporates both optical fiber along with coaxial cable to create a broadband network. ... The network layer is third layer out of seven in OSI model and it is the third layer out of five in TCP/IP model. ... The Internet Protocol (IP) is a data-oriented protocol used for communicating data across a packet-switched internetwork. ... This article or section does not cite any references or sources. ... In computing and telecommunications, the transport layer is the second highest layer in the four and five layer TCP/IP reference models, where it responds to service requests from the application layer and issues service requests to the Internet layer. ... User Datagram Protocol (UDP) is one of the core protocols of the Internet protocol suite. ... It has been suggested that this article or section be merged into Computer port (software). ... NetBEUI redirects here. ... The application layer is the seventh level of the seven-layer OSI model. ... (DHCP) is a set of rules used by a communications device such as a computer, router or network adapter to allow the device to request and obtain an IP address from a server which has a list of addresses available for assignment. ... The simple network management protocol (SNMP) forms part of the internet protocol suite as defined by the Internet Engineering Task Force (IETF). ... Trivial File Transfer Protocol (TFTP) is a very simple file transfer protocol, with the functionality of a very basic form of FTP; it was first defined in 1980. ...


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. This article is about a computer networking device. ... The Internet Protocol (IP) is a data-oriented protocol used for communicating data across a packet-switched internetwork. ... This article or section does not cite any references or sources. ... In computer networking a Media Access Control address (MAC address) or hardware address or adapter address is a quasi-unique identifier attached to most network adapters (NICs). ...


History

LANcity

LANcity was an early pioneer in cable modems, developing a proprietary system that saw fairly wide deployment in the US. LANcity was sold to Bay Networks which was then acquired by Nortel, which eventually spun the cable modem business off as ARRIS. ARRIS continues to make cable modems and CMTS equipment compliant with the DOCSIS standard. Bay Networks Bay Networks was formed through the merger of Santa Clara, California based SynOptics Communications and Billerica, Massachusetts based Wellfleet Communications on July 6, 1994. ... Northern Telecommunications Networks, commonly known as Nortel, is a telecommunications equipment manufacturer headquartered in Canada. ... An arris is an architectural term that describes the intersection between two outside planes such as the corner of a masonry unit or the intersection of divergent architectural details. ... An arris is an architectural term that describes the intersection between two outside planes such as the corner of a masonry unit or the intersection of divergent architectural details. ... A cable modem termination system or CMTS is equipment typically found in a cable companys headend and is used to provide high speed data services, such as Cable Internet or Voice over IP, to cable subscribers. ... Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ...


CDLP

CDLP was a proprietary system that was made by Motorola. CDLP CPE was capable of both PSTN (telephone network) and RF (cable network) return paths. The PSTN return path cable modem service was considered 'one way cable' and had many of the same drawbacks as satellite internet service, and as a result it quickly gave way to two way cable. Cable modems that used the RF cable network for the return path were considered 'two way cable', and were better able to compete with DSL which was bidirectional. The standard is more or less defunct now with new providers using, and existing providers having changed over to, the DOCSIS standard. The Motorola CDLP Proprietary CyberSURFR is an example of a modem that was built to the CDLP standard, capable of a peak 10 Mbit/s downstream and 1.532 Mbit/s upstream. (CDLP supported a maximum downstream bandwidth of 30 Mbit/s which could be reached by using several modems.) Motorola Surfboard cable modem A cable modem is a type of modem that provides access to a data signal sent over the cable television infrastructure. ... Motorola Inc. ... Customer premises (or provided) equipment (CPE): Terminal and associated equipment and inside wiring located at a subscribers premises and connected with a carriers communication channel(s) at the demarcation point (demarc) . In other words, CPE is an acronym meaning customer premises equipment. ... The public switched telephone network (PSTN) is the concatenation of the worlds public circuit-switched telephone networks, in much the same way that the Internet is the concatenation of the worlds public IP-based packet-switched networks. ... A television network is a distribution network for television content whereby a central operation provides programming for many television stations. ... A Wild Blue Satellite Internet dish. ... DSL may refer to: Damn Small Linux Dark and Shattered Lands, a MUD based loosely on Forgotten Realms and Dragonlance books. ... Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ... A megabit per second (mbps or mbit/s) is a unit of data transmission equal to 1,000 kilobits per second or 1,000,000 bits per second. ...


The Australian ISP BigPond employed this system when it started cable modem trials in 1996. For a number of years cable Internet access was only available to Sydney, Melbourne and Brisbane via CDLP. This network ran parallel to the newer DOCSIS system for a number of years. In 2004 the CDLP network was switched off and now is exclusively DOCSIS. In Australia, BigPond is Telstras brand name for consumer dialup and broadband ADSL, cable modem, satellite internet services and Wireless Broadband (EVDO) via the Telstra Internet national backbone. ... This article is about the metropolitan area in Australia. ... This article is about the Australian city; the name may also refer to City of Melbourne or Melbourne city centre. ... For other uses, see Brisbane (disambiguation). ... Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ... Year 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ...


IEEE 802.14

In the mid-1990s the IEEE 802 committee formed a subcommittee (802.14) to develop a standard for cable modem systems. While significant progress was made, the group was disbanded when North American MSOs instead backed the fledgling DOCSIS specification. IEEE 802 refers to a family of IEEE standards about local area networks and metropolitan area networks. ... M.S.O. (MULTIPLE SYSTEM OPERATOR) In the cable TV industry, an operator of multiple cable systems. ... Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ...


DOCSIS

In the late 1990s, a consortium of US cable operators, known as "MCNS" formed to quickly develop an open and interoperable cable modem specification. The group essentially combined technologies from the two dominant proprietary systems at the time, taking the physical layer from the Motorola CDLP system and the MAC layer from the LANcity system. When the initial specification had been drafted, the MCNS consortium handed over control of it to CableLabs. CableLabs took on maintenance of the specification, promoted it in various standards organizations (notably SCTE and ITU), developed a certification testing program for cable modem equipment, and has since drafted multiple extensions to the original specification. Virtually all cable modems operating in the field today are compliant with one version or another of DOCSIS. Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ... This article does not cite any references or sources. ... Motorola Inc. ... Motorola Surfboard cable modem A cable modem is a type of modem that provides access to a data signal sent over the cable television infrastructure. ... The Media Access Control (MAC) data communication protocol sub-layer is a part of the data link layer specified in the seven-layer OSI model (layer 2). ... Cable Television Laboratories, Inc. ... The Society of Cable Telecommunications Engineers (SCTE) is an organization that develops training for cable television installers and engineers; in this role it is analogous to the Society of Broadcast Engineers for broadcast television. ... This article is about the location. ... Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ...


Cable modems and VoIP

With the advent of Voice over IP telephony, cable modems can also be used to provide telephone service. Many people who have cable modems have opted to eliminate their Plain Old Telephone Service (POTS). Because most telephone companies do not offer naked DSL (DSL service without a POTS line), VoIP use is higher amongst cable modem users. how VoIP works A typical analog telephone adapter for connecting an ordinary phone to a VoIP network Ciscos implementation of VoIP - IP Phone Voice over Internet Protocol, also called VoIP, IP Telephony, Internet telephony, Broadband telephony, Broadband Phone and Voice over Broadband is the routing of voice conversations over... Plain old telephone service, or POTS, are the services available from analogue telephones prior to the introduction of electronic telephone exchanges into the public switched telephone network. ... A naked DSL (a. ... A DSL Modem DSL or xDSL, is a family of technologies that provide digital data transmission over the wires of a local telephone network. ... POTS may mean: Plain old telephone service (aka Public Switched Telephone Network (PSTN) or Post Office Telephone Service or Post Office Telephone System) Postural orthostatic tachycardia syndrome This article consisting of a 4-letter acronym or initialism is a disambiguation page — a list of pages that otherwise might share the... IP Telephony, also called Internet telephony, is the technology that makes it possible to have a telephone conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines. ...


A cable modem subscriber can make use of VoIP telephony by subscribing to a third party service (e.g. Vonage or Skype). As an alternative, many cable operators offer a VoIP service based on PacketCable. PacketCable allows MSOs to offer both High Speed Internet and VoIP through a single piece of customer premise equipment, known as an Embedded Multimedia Terminal Adapter (EMTA or E-MTA). An EMTA is basically a cable modem and a VoIP adapter (known as a Multimedia Terminal Adapter) bundled into a single device. PacketCable service has a significant technical advantage over third-party providers in that voice packets are given guaranteed Quality of Service across their entire path so that call quality can be assured. IP Telephony, also called Internet telephony, is the technology that makes it possible to have a telephone conversation over the Internet or a dedicated Internet Protocol (IP) network instead of dedicated voice transmission lines. ... Vonage Logo until 2006 Vonage (NYSE: VG) (pronounced ) is a publicly-held commercial voice over IP (VoIP) network and SIP company that provides telephone service via a broadband connection (the companys name is a play on their motto Voice-Over-Net-AGE). Vonage promotes itself as Vonage the Broadband... Skype (IPA pronunciation: , rhymes with type) is a software program created by the entrepreneurs Niklas Zennström and Janus Friis. ... PacketCable™ is an organization started by CableLabs® in Colorado. ... M.S.O. (MULTIPLE SYSTEM OPERATOR) In the cable TV industry, an operator of multiple cable systems. ... In the fields of packet-switched networks and computer networking, the traffic engineering term Quality of Service (QoS) refers to control mechanisms that can provide different priority to different users or data flows, or guarantee a certain level of performance to a data flow in accordance with requests from the...


See also

Data Over Cable Service Interface Specifications (DOCSIS) is an international standard developed by CableLabs and contributing companies that include: ARRIS, BigBand Networks, Broadcom, Cisco, Conexant, Correlant, Intel, Motorola, Netgear, Terayon, and Texas Instruments. ... A cable modem termination system or CMTS is equipment typically found in a cable companys headend and is used to provide high speed data services, such as Cable Internet or Voice over IP, to cable subscribers. ... Hybrid Fibre Coaxial (HFC) is a telecommunications industry term for a network which incorporates both optical fibre along with coaxial cable to create a broadband network. ... This is a list of device bandwidths: the channel capacity (or, more informally, bandwidth) of some computer devices employing methods of data transport is listed by bit/s, kilobit/s (kbit/s), megabit/s (Mbit/s), or gigabit/s (Gbit/s) as appropriate and also MB/s or megabytes per... In telecommunications, the Triple Play service is a marketing term for the provisioning of the three services: high-speed Internet, television (Video on Demand or regular broadcasts) and telephone service over a single broadband connection. ...

Cable modem manufacturers

3Com (NASDAQ: COMS) is a manufacturer best known for its computer network infrastructure products. ... Ambit Broadband are a Taiwanese supplier of Broadband Internet equipment including Cable Modem, ADSL Modems, VoIP[1] IPTV etc. ... An arris is an architectural term that describes the intersection between two outside planes such as the corner of a masonry unit or the intersection of divergent architectural details. ... “Cisco” redirects here. ... D-Link Corporation is a Taiwanese company that manufactures wireless and Ethernet computer networking products for both consumer and SOHO users. ... Ericsson () NASDAQ: ERIC. Founded in 1876, Ericsson is a leading provider of communications networks, related services and handset technology platforms. ... A 802. ... Motorola Inc. ... Nortel Networks Corporation TSX: NT NYSE: NT, formerly known as Northern Telecom Limited and now known simply as Nortel, is a multinational telecommunications equipment manufacturer headquartered in Toronto, Canada. ... Philips HQ in Amsterdam Koninklijke Philips Electronics N.V. (Royal Philips Electronics N.V.), usually known as Philips, (Euronext: PHIA, NYSE: PHG) is one of the largest electronics companies in the world, founded and headquartered in the Netherlands. ... RCA, formerly an acronym for the Radio Corporation of America, is now a trademark owned by Thomson SA through RCA Trademark Management S.A., a company owned by Thomson. ... Scientific Atlanta is a large manufacturer of cable television, telecommunications, and broadband equipment. ... Terayon Communication Systems, Inc. ... This article is about the media and entertainment company. ... Toshiba Corporations headquarters (Center) in Hamamatsucho, Tokyo Toshiba Corporation sales by division for year ending March 31, 2005 Toshiba Corporation ) (TYO: 6502 ) is a Japanese multinational conglomerate manufacturing company, headquartered in Tokyo, Japan. ... Zoom Technologies, Inc. ...

External links


  Results from FactBites:
 
DSL vs Cable modem (11969 words)
Cable modems, which allow users to connect using the cable television network, seem to be first out of the gate with broader availability and lower costs with some concern about the security issues.
Cable modems are designed to take advantage of the "broadband" cable infrastructure enabling peak connection speeds over 100 times faster than traditional dial-up connections.
Because some cable networks are suited for broadcast television services, cable modems may use either a standard telephone line or a QPSK/16 QAM modem over a two-way cable system to transmit data upstream from a user location to the network.
Cable modem - Wikipedia, the free encyclopedia (759 words)
Cable modems are primarily used to deliver broadband Internet access, taking advantage of unused bandwidth on a cable television network.
The PSTN return path cable modem service was considered 'one way cable' and had many of the same drawbacks as satellite internet service, and as a result it quickly gave way to two way cable.
Cable modems that used the RF cable network for the return path were considered 'two way cable', and were better able to compete with DSL which was bidirectional.
  More results at FactBites »

 
 

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