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Its purpose varies depending on the device connected, but the most specific meaning is to indicate when a modem is connected to another remote modem via telephone lines. The word "carrier" is a reference to the analog carrier signal generated by a modem, which is modulated to carry the data. On a data modem, the carrier's loss equates to the ...
The calling modem waits for the tone after it dials the phone line before it initiates data transmission. If it does not receive a carrier tone within a set amount of time, it will disconnect the phone line and issues the NO CARRIER message. The actual data is transmitted from the answering modem to the calling modem via modulation of the carrier.
The modem only uses frequencies above 8 kHz, to avoid interfering with normal phone service. The bandwidth of the line between 8 kHz and about 1 MHz is divided into 247 separate channels, each 4 kHz wide. [2] A separate carrier signal carries information in each channel. Thus the system acts like 247 separate modems operating simultaneously.
Dial-up doesn't work with phone services offered by cable companies. Check your physical phone connection - A loose cable or cord can often be the cause of a connection problem. Unplug all phone devices in your home - Unplug all phone devices in your home, then reconnect just the modem. Try to connect online, and if it works, plug in each ...
The command AT+FCLASS=8 or AT#CLS=8 will put the modem in voice mode. Most modems still remain on-hook and respond with OK . Once this command has been accepted, most modems will respond with Data Link Escape (DLE) messages instead of or in addition to normal modem responses.
Xfinity Voice (formerly Comcast Digital Voice) is a Voice Over IP cable telephony service that was launched in 2005 in some markets, [75] and to all of Comcast's markets in 2006. Comcast's older service, Comcast Digital Phone, continued to offer service for a brief period, until Comcast shut it down around in late 2007. [76]
Therefore, the modem will ignore the weaker signal and show no problem. Line in bridge tap technology can be much less performing caused to the high attenuation added and to the length of the cable itself. Bridged tap technology does not add latency. But it affects the performance of the line in general, it affects the bandwidth a lot.
Two simple NIDs, carrying six lines each, on the outside of a building A German copper phone line termination box called Abschlusspunkt LinienTechnik (APL, "Demarcation point") In telecommunications , a network interface device ( NID ; also known by several other names) is a device that serves as the demarcation point between the carrier's ...