DSL
This page presents information about data transmission in both the transmit and receive directions of communication. You receive information about the quality of the line, and meters are displayed for error events on the ADSL layer.
Click on the "Refresh" button to view the current values.
Information on the Data Rates
| Max. DSLAM throughput | Highest possible speed of data transmission at the DSL exchange (DSLAM). |
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| Min. DSLAM throughput | Lowest possible speed of data transmission at the DSL exchange (DSLAM). |
| Attainable data rate | The maximum volume of data that can be sent on the line. |
| Current throughput | The bit rate actually configured on the line. This is the speed at which the data are transmitted over the line. |
| Seamless Rate Adaptation | Technology for ADSL2+ that adjusts the speed of data transmission to the transmission quality of the DSL connection without re-synchronizing the DSL connection. This process is switched on or off at the DSL central exchange (DSLAM). When it is switched on, the FRITZ!Box will use it. |
| Energy-saving mode L2 | Power-saving function of ADSL2+. When it is active, it reduces power when the DSL line is subject to no or little use. This function is switched on or off at the DSL exchange (DSLAM). When it is switched on, the FRITZ!Box will use this function. |
| Latency | The time that a symbol word needs to arrive completely at the other end of the transmission path (DSLAM or modem). |
| Impulse Noise Protection (INP) | Impulse noise protection: The higher the value displayed here, the lower the impulse noise. |
| G.INP | |
| Signal-to-noise ratio | Rate (in dB) by which the signal can become weaker before an error rate of 10-7 occurs. |
| Bitswap | A bit swap makes it possible to adjust data transmission to changing line conditions by redistributing the bits over the carriers. Data throughput remains unchanged in a bit swap. If a bit swap is needed, its performance is negotiated with the telephone exchange. |
| Line attenuation | Rate (in dB) by which the signal is attenuated during transmission. |
| Power reduction | If the communication between the modem and DSLAM is good, for instance because they are located very close to each other, the power can be cut back to reduce the minimum energy requirement and minimize interference in cables in the vicinity. |
| Carrier record | This value indicates which handshakes are used for Annex J or VDSL |
Error Events on the ADSL Layer in the FRITZ!Box and at the Central Exchange
| Errored Seconds (ES) | ES stands for "Errored Seconds". This value indicates the number of seconds during which transmission errors occurred. The seconds are counted starting from when the DSL connection is established. |
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| Severely Errored Seconds (SES) | SES stands for "Severely Errored Seconds". This value indicates the number of seconds during which many transmission errors occurred. |
| Forward Error Correction (FEC) | A transmission error was corrected using the check bytes of a code word. |
| Cyclic Redundancy Check (CRC) | The check sum of the superframe transmitted by the remote party does not correspond to the sum calculated locally. Possible cause: Disturbances on the line |