Also found in: Dictionary, Medical, Financial, Acronyms.
Related to CMTS: DOCSIS


(Cable Modem Termination System) A computer-based device that enables cable modems to send and receive packets over the Internet. It inserts IP packets from the Internet into MPEG frames and transmits them to the cable modems via an RF signal. It reverses the process coming from the cable modems.

A DOCSIS-compliant CMTS enables the customer's router or PC to dynamically obtain an IP address from the cable company by acting as a proxy and forwarding requests to DHCP servers. The CMTS may include a variety of functions, including filtering to protect against theft of service and denial of service attacks as well as preventing hackers from breaking into the cable system. It may also provide traffic shaping, which guarantees quality of service (QoS) to selected customers, and it may provide bridging or routing capabilities. See cable modem.

Cable Modem Infrastructure
A CMTS performs packet format conversion and IP address assignment (see DHCP). It may also provide routing, bridging, filtering and traffic shaping. The combiner merges the TV programming feeds with the RF data from the CMTS.

A Small CMTS
This CMTS supports approximately 1,300 users. It provides one downstream port of 40 Mbps and up to 6 upstream ports of 10 Mbps each. (Image courtesy of ADC Telecommunication, Inc.)
References in periodicals archive ?
Over the past two years we've worked closely with our customers to plan IPv6 feature support for our C4 CMTS portfolio," said Todd Kessler, ARRIS VP, CMTS Product Management.
We are pleased to announce this next step in the continuing evolution and upgrade of the C4 CMTS platform," said Arris vice president of product management Todd Kessler.
0 CMTS and cable modem chips also feature TurboQAM(R) technology that provides a 33 percent improvement over reverse path speeds and a 25 percent improvement over downstream speeds in support of the DOCSIS 3.
Modular CMTS is designed to economically increase DOCSIS capacity by separating MAC (media access control) routing and DOCSIS signaling, from the edge QAM (quadrature amplitude modulation), with each performed on purpose- designed platforms.
We are confident that our introduction of this new CMTS module will result in tremendous benefits to cable operators who require a proven, carrier-class solution to roll out advanced IP solutions.
Heynen adds: "Three major trends will keep the Latin American CMTS market lively going forward: The cable companies are locked in major battles with incumbent telcos for subscribers, CMTS vendors brought down the price of their DOCSIS 3.
The CCAP-capable E6000 CER continues the highly successful legacy of the C4 CMTS and delivers new levels of density and cost-effectiveness in a simple, robust and integrated architecture.
The ARRIS C4 CMTS based solution provides us with the first DOCSIS 3.
Combined CMTS and edge QAM revenue grew 5% in the final quarter of 2011, ending the year on a high note, up 17% from the year-ago quarter
0 and flexible upstream to downstream ratios defined in the M-CMTS architecture along with all of the reliability, performance and management benefits of a traditional CMTS in a single package.
Designed to provide advanced IP services for smaller cable systems, small regions of a large MSO's network and business-to-business environments such as hospitals, multi-dwelling units and universities, the Cuda 1000 has one of the highest density port counts of all systems in the compact CMTS category.
Innovation Allows Cable Operators to Cost-EffectivelyCombine High Bandwidth Services onto a Single CMTS Platform