Channels
Internet / Cable Information / Channels
The table on the "Cable Internet" page lists properties of the signal transmission on the cable channeks.
Click on the "Refresh" button to view the current values.
Values are displayed for the following properties:
| Channel ID | The "Channel" ID is an ID number assigned to each channel by the cable network operator. The "Channel ID" is transmitted with the configuration file. |
| Frequency (MHz) | The frequency on which a channel is active. |
| Modulation | Modulation is a process used in telecommunications to change a carrier signal through a useful signal to be transmitted. For internet connections over cable, the QAM (quadrature amplitude modulation) method is used. The higher a QAM value, the higher the transmission rate. The QAM value depends on the line quality. Lower QAM modulation is generally used for lower-quality lines. |
| Mutliplex technique | Multiplex techniques are methods for transmitting signals and messages in which multiple signals are combined into one and transmitted simultaneously over a single medium. The ATDMA profile is used on your cable line. ATDMA is a time multiplex method that stands for "Asynchronous Time Division Multiple Access". It is used to assign time slots to the various cable internet users connected to a single CMTS, within which they can send signals toward the CMTS. This method is applied only in the send direction. |
| Power level | The "Power Level" line displays the signal level on the individual channels. The signal level is given here in dBmV. In the millivolt and microvolt range, dBmV has the same meaning as decibel. |
| MSE | MSE is short for "mean squared error". |
| Latency | Latency is the time that a symbol word needs to arrive at the other end of the transmission path (CMTS or modem) in the correct sequence. |
| correctable errors | For a reliable DOCSIS transmission on the Internet line, what are known as "code words" are used. This value specifies the number of code words received that contained correctible errors. Causes for errors can include disturbances on the line. Whether or not a code word can be corrected depends on the ratio of protection bits to the number of bit errors in the code word. |
| non-correctable errors | For a reliable DOCSIS transmission on the Internet line, what are known as "code words" are used. This value specifies the number of code words received that contained correctible errors. Causes for errors can include disturbances on the line. Whether or not a code word can be corrected depends on the ratio of protection bits to the number of bit errors in the code word. |