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Data Carrier Detect (DCD) or Carrier Detect (CD) is a control signal present inside an RS-232 serial communications cable that goes between a computer and another device, such as a modem. This signal is a simple "high/low" status bit that is sent from a data communications equipment (DCE) to a data terminal equipment (DTE), i.e., from the modem ...
The 1200 bit/s market existed for a relatively short time; in 1984 the CCITT introduced the V.22bis standard for 2400 bit/s operation. This was the first time that the CCITT's standard predated Bell's introductions, avoiding compatibility issues that had plagued earlier standards. Modem companies quickly incorporated V.22bis into their product ...
The 1200 bit/s mode is compatible with V.22. V.23 is an ITU-T recommendation for half-duplex communication between two analogue dial-up modems using FSK modulation at up to 600 or 1200 baud to carry digital data at up to 600 or 1200 bit/s respectively. An optional 75 baud reverse channel carries 75 bit/s. V.24 is referenced as RS-232 which also ...
In network topology, a cable modem is a network bridge that conforms to IEEE 802.1D for Ethernet networking (with some modifications). The cable modem bridges Ethernet frames between a customer LAN and the coax network. Technically, it is a modem because it must modulate data to transmit it over the cable network, and it must demodulate data ...
Cable Haunt is the code name assigned to represent two separate vulnerabilities that affect many of the cable modems in use around the world in 2020. [ 1 ] [ 2 ] These vulnerabilities allow an attacker to obtain external access to a cable modem and perform any number of activities intended to modify the operation of, or monitor the data passing ...
The 201A Data-Phone was a synchronous modem using two-bit-per-symbol phase-shift keying (PSK) encoding, achieving 2,000 bit/s half-duplex over normal phone lines. [10] In this system the two tones for any one side of the connection are sent at similar frequencies as in the 300 bit/s systems, but slightly out of phase.
64-QAM and 256-QAM are often used in digital cable television and cable modem applications. In the United States, 64-QAM and 256-QAM are the mandated modulation schemes for digital cable (see QAM tuner) as standardised by the SCTE in the standard ANSI/SCTE 07 2013. In the UK, 64-QAM is used for digital terrestrial television whilst 256-QAM is ...
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.
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