What is cmts

View Full Term. By clicking sign up, you agree to receive emails from Techopedia and agree to our Terms of Use and Privacy Policy. A cable modem termination system CMTS is device usually found in the headend or hubsite of a cable company that allows exchange of digital signals on a cable network with cable modems. A cable modem termination system is used for providing high-speed data services like Voice over Internet Protocol VoIP or cable internet to subscribers.

It has both RF and Ethernet interfaces. A CMTS mostly carries Internet Protocol traffic, and it both transmits and receives digital cable modem signals on a cable network. A CMTS transmits signals to the user's cable modem and also receives signals from it, converting them into IP packets and routing them to the designated internet service provider, in order to get connected via internet.

In other words, a CMTS makes use of the incoming traffic from customers on a single channel and routes them to an ISP for connecting to an internet.

In a system making use of a CMTS, cable modems communicate by channeling their signals through the CMTS and cannot directly communicate among themselves. In integrated CMTS, all the components are placed under a single chassis. One of the major advantages of integrated CMTS is in having fewer single points for failure, ease of deployment and lower costs.

One of the biggest advantages of M-CMTS is its ability to scale to huge numbers depending on the downstream channels. Unlike other techniques, CMTSs are capable of serving different cable modem population sizes.

Additionally, the cable modems associated with CMTS are not dependent on distance for quality of service. CMTS is capable of doing some basic filtering for protecting against various attacks and unauthorized users. It can also act as a router or a bridge in a network. By: Justin Stoltzfus Contributor, Reviewer.

The Eth Out interface contains the IP packets which are sent to the other router in the network. Thus in this interface the data is in the form of IP packets which are write on Layer 2.

RF Out port have the coaxial cable which further goes into the combiner then this mixed signal goes to the subscriber end. This filter is traffic shaper. It is used to control the upstream traffic for each subscriber. What is Cable Modem. In the figure at subscriber end voice defines the telephone and data defines request comes threw laptop or computers for internet access.

So when a subscriber request for data , voice and tv service then request for these things goes into the Cable Modem. This cable modem then modulate the information. This information goes to the combiner located at Digital Headend System. This requested information is demodulated and then send to the next router.

Here in this section voice request send to the gateway which forward it to the Public Telephone Network. Data request from this big router goes to internet section as shown in the figure to fulfill the data request.

As shown above in the figure there is medium between combiner and cable modem. The output of combiner is coaxial. Then we use the Optical Transmitters to send this signal at long distance.