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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 ?
The interoperability event involved the following companies representing cable modem termination system (CMTS) headend equipment, consumer premise cable modems and test equipment: ARRIS; BigBand Networks; Broadcom Corp.
The major product segments analyzed are Cable Customer Premise Equipment, and Cable Modem Termination System Equipment.
DENVER -- In a continuing effort to show cable operators and multiple system operators (MSOs) how to deliver "The Connected Life," Cisco Systems(R) (NASDAQ:CSCO) unveiled a new wideband solution involving channel bonding, low-cost edge quadrature amplitude modulators (QAMs) and cable modems together with the industry-leading Cisco(R) uBR10012 cable modem termination system (CMTS).
Working with any PacketCable(TM) Multimedia-compliant cable modem termination system (CMTS), the Cable Dynamic Threat Mitigation solution integrates Juniper's routing platforms, Intrusion Detection and Prevention (IDP) devices and SDX Service Deployment System, enabling MSOs to quickly and effectively identify and isolate security threats so that infected customers and operations staff can be notified.
In its booth, Juniper will showcase solutions on Secure and Assured Voice, core and edge routing, PacketCable Multimedia, and the company's Modular Cable Modem Termination System (M-CMTS) joint development effort with Motorola.