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Cable modem termination system. A cable modem termination system (CMTS, also called a CMTS Edge Router) [1] is a piece of equipment, typically located in a cable company's headend or hubsite, which is used to provide data services, such as cable Internet or Voice over IP, to cable subscribers.
DOCSIS employs a mixture of deterministic access methods for upstream transmissions, specifically time-division multiple access (TDMA) for DOCSIS 1.0/1.1 and both TDMA and S-CDMA for DOCSIS 2.0 and 3.0, with a limited use of contention for bandwidth reservation requests. In TDMA, a cable modem requests a time to transmit and the CMTS grants it ...
Technically, it is a modem because it must modulate data to transmit it over the cable network, and it must demodulate data from the cable network to receive it. It implements an Ethernet PHY on its LAN interface, and a DOCSIS-defined cable-specific PHY on its HFC cable interface. The term cable modem refers to this
Cable CPE: Cable Modem, [2] eMTA, Wireless Gateway, Wireless Voice, Gateway IPTV; Home Networking devices: Wifi Extender, MoCA [3] ECB; Module: DOCSIS 2.0, DOCSIS 3.0, [4] DOCSIS 3.1 [5] Infrastructure: Outdoor Cable Modem, Proactive Network, Management System, DOCSIS Probe; 5G Small Cell Backhaul Solutions; Coax Network Testing Tools
3.1.5.1.1 Early 56k dial-up ... compared to $100 for standard 33k modems. Compatible equipment was also required ... Voice modems are used for computer telephony ...
Additionally, V.34 modems employ shell mapping as shaping code to reduce the transmit power. [5] V.34 (10/96) is an updated ITU-T recommendation for a modem, building on the V.34 standard but allowing up to 33.6 kbit/s bidirectional data transfer. Other additional defined data transfer rates are 31.2 kbit/s, as well as all the permitted V.34 rates.
For audio communications, there is a common agreement about the BFO oscillator shift of 1.7 kHz. A voice signal is sensitive to about 50 Hz shift, with up to 100 Hz still bearable. Some receivers use a carrier recovery system, which attempts to automatically lock on to the exact IF frequency. The carrier recovery doesn't solve the frequency shift.
Echo suppression and echo cancellation are methods used in telephony to improve voice quality by preventing echo from being created or removing it after it is already present. In addition to improving subjective audio quality, echo suppression increases the capacity achieved through silence suppression by preventing echo from traveling across a ...
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