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(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 ?
A cable modem termination system (CMTS) equipment is most of the cases found in a cable company's headend or at the cable company hubsite.
Harmonics CableOS virtualized CCAP solution is the industrys only software-based Cable Modem Termination System (CMTS) and the first end-to-end Remote PHY system, delivering unparalleled scalability, agility and cost savings.
By doing this, Motorola's integrated cable modem termination system (I-CMTS) solution addresses two key business needs for cable operators today: higher speed service rates to attract new customers and greater capacity to alleviate network congestion and maintain customer satisfaction.
ARRIS (NASDAQ:ARRS), Suwanee, Ga., has announced that iTSCOM, a brand name of its communications Inc., has placed a significant order for the DOCSIS 3.0-qualified ARRIS Integrated CMTS high speed data solution, based on the ARRIS C4(R) Cable Modem Termination System (CMTS).
Harmonics CableOS virtualized CCAP solution features the industrys first software-based Cable Modem Termination System (CMTS), the first end-to-end Remote PHY system, and leading RF port density, offering unprecedented scalability, agility and cost savings.
Service Electric Broadband Cable is implementing the DOCSIS 3.0 solutions using the Cisco uBR10012 Cable Modem Termination System (CMTS), combined with the Cisco RF Gateway Series of universal-edge quadrature amplitude modulation (U-EQAM) products.
BigBand Networks, Inc., Redwood City, Calif., a leading provider of network platforms for video, voice and data services, has announced that multiple European cable operators-including Multikabel in the Netherlands and Austria's LiWest Kabelmedien GmbH are evaluating the BigBand modular cable modem termination system (M-CMTS).
ADC (Nasdaq:ADCT; has announced that it has started volume shipments of the compact Cuda 1000 Cable Modem Termination System (CMTS) to multiple systems operators (MSO) in the United States and Europe, including WideOpenWest (WOW) with systems in Illinois, Michigan and Ohio.
Network is soliciting bids for the purchase of one Cisco cBR8 Cable Modem Termination System Router, plus one cBR8 Lab router chassis, power supplies and line cards.
The deployment of the CMTS solution, which is based on the ARRIS C4 Cable Modem Termination System (CMTS), is expected to enable iTSCOM to offer 'Kattobi Super Wide' high speed data service, delivering 160 Mb/s in the downstream and 10 Mb/s in the upstream, to residential customers in West Tokyo and Kanagawa prefecture.
has unveiled operation of channel bonding on the BigBand Modular CMTS (cable modem termination system) solution.
With this announcement, the Cuda 12000 becomes the industry's first carrier-class cable modem termination system (CMTS) with integrated VoIP gateway functionality.