CMTS or cable modem termination system, consists of devices located in the cable providers' custom headend that allows cable television operators to offer high-speed Internet access to home computers. The CMTS sends and receives digital cable modem signals on a cable network, more specifically it 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. The CMTS provides many of the same functions provided by the DSLAM in a DSL system.
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.
Most CMTS can support up to 2,000 subscribers, however keeping the number of CMs per upstream port reasonable is strongly recommended. This is because a DOCSIS upstream channel is a multiple access time-aligned contention based communication channel. We do not want the contention level on any single upstream to be so high as to cause excessive multiplicity of collisions with ill effects of laser clipping, etc. Basically, if the upstream is excessively loaded with too many modems then it may take longer for modems to recover to online state which can impact customer satisfaction.
Toner Cable, a leading distributor of headend electronics, offers CMTS (Cable Modem Termination Systems) from C9 Networks, Casa, and Pico Digital. Choose from either DOCSIS 1.0 or DOCSIS 3.0 CMTS', or even the Mini Cable Modem Termination System which supports up to 400 DOCSIS 2.0 cable modems. Looking to buy CMTS? When you are ready to offer your subscribers carrier-grade voice, high-speed data, and IPTV solutions, ask Toner's in house engineers which CMTS is right for you.