This page presents information about the throughput rates for 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 the "Refresh" button to view the current values.
Information on Throughput Rates:
| Max. DSLAM throughput | The maximum transmission rate possible at the DSL exchange station (DSLAM). |
| Min. DSLAM throughput | The minimum transmission rate possible at the DSL exchange station (DSLAM). |
| Attainable throughput | The maximum transmission rate physically possible on the line |
| Current throughput | The current data rate is the bit rate actually configured on the line. This is the speed at which the data are transmitted over the line. |
| Latency | Latency is the time that a symbol word needs to arrive at the other end of the transmission path (DSLAM or modem) in the correct sequence. |
| Bit swap | 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. |
| Seamless Rate Adaptation | A technology for ADSL2+ that adjusts the data rate to the transmission quality of the DSL connection without re-synchronizing the DSL connection. This process is switched on or off at the DSL exchange (DSLAM). When it is switched on, the FRITZ!Box will use it. |
| Impulse Noise Protection | Impulse noise protection: The higher the value displayed here, the lower the impulse noise. |
| L2 Power mode | A 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. |
Information on Line Quality
| Signal-to-noise ratio | Rate (in dB) by which the signal can become weaker before an error rate of 10^-7 occurs |
| Line attenuation | Rate (in dB) by which the signal is attenuated during transmission |
| Power cutback | 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. |
Error Events on the ADSL Layer:
| CPE (Customer Premises Equipment) | ADSL terminal device |
| COE (Central Office Equipment) | ADSL devices at the exchange |
| Loss of Signal (LOS) | The pilot tone has been lost. Results in a retrain procedure. Possible causes: Disturbances on the line or an interrupted cable connection. |
| Loss of Frame (LOF) | The synchronization frame has been lost. Results in a retrain procedure. Possible cause: Disturbances on the line. |
| 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. |
| No Cell Delineation (NCD) | The ATM connection is in HUNT or PRESYNC mode (while attempting to connect). |
| Header Error Control (HEC) | The ATM connection is in HUNT or PRESYNC mode. |