Interference Resistance

When the DSL connection is established, specific connection parameters are negotiated between the exchange and the FRITZ!Box. Under some circumstances it may not be possible to take into consideration interference caused at peak load times or by electrical devices in the household.

Adjusting Interference Resistance

In order to increase stability against interference pulses, you can change the settings of your FRITZ!Box as far toward "Maximum stability" as possible. Do not change the preconfigured settings if your DSL connection is stable.

  1. Move the control toward "Maximum stability" step by step until the DSL connection is stable again.

    Keep in mind that the data throughput of the DSL connection is reduced accordingly.

  2. Click "Apply" to submit your settings to the FRITZ!Box. The DSL connection then will be established anew using the changed parameters.

    These settings are not supported by all remote stations. If the problems with the DSL connection cannot be resolved in this way, change the setting back to "Maximum performance".

Intended signal-to-noise ratio The signal-to-noise ratio is a value for the quality of the DSL signal. The higher the ratio, the more stable the DSL connection. The signal-to-noise ratio cannot be influenced.
Impulse Noise Protection (INP) The electronic immunity of the DSL connection to sources of interference can be increased by means of Impulse Noise Protection. When you move this control step by step toward "Maximum stability", the FRITZ!Box negotiates the DSL connection by applying such technologies to increase the electromagnetic immunity of the connection.
Identification of radio frequency interference (RFI) Under some circumstances radio transmitters located nearby can interfere with DSL communication (RFI: Radio Frequency Interference). This normally will be detected automatically by the FRITZ!Box. If this identification does not work correctly or if an additional source of interference appears, you can move this control step by step toward "Maximum stability" to improve the DSL connection.

Annex Settings

Select the annex used on your DSL line. The following table will assist you in making this selection. However, we cannot guarantee the accuracy of the information in the table.

Important:
If you select the wrong annex type, the telephony function may be disrupted. In some cases it may not be possible to synchronize DSL.

Annex A Afghanistan, Albania, Algeria, Andorra, Antigua, Argentina, Armenia, Australia, Azerbaijan, Bahamas, Bahrain, Bangladesh, Barbados, Barbuda, Belarus, Belize, Benin, Bhutan, Bolivia, Brazil, Brunei Darussalam, Bulgaria, Burkina Faso, Burundi, Cambodia, Cameroon, Canada, Central African Republic, Chad, Chile, China, Colombia, Comoros, Congo (Democratic Republic), Congo (Republic), Costa Rica, Côte d'Ivoire (Ivory Coast), Cuba, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Eritrea, Equatorial Guinea, Ethiopia, Fiji, Finland, France, Gabon, Gambia, Georgia, Ghana, Great Britain, Grenada, Guatemala, Guinea, Guinea-Bissau, Guyana, Haiti, Honduras, India, Indonesia, Iran, Iraq, Ireland, Israel, Italy, Jamaica, Jordan, Kazakhstan, Kenya, Kyrgyztan, Kiribati, Korea (Democratic People's Republic, North Korea), Korea (Republic of Korea, South Korea), Kuwait, Laos, Lebanon, Lesotho, Liberia, Libya, Lithuania, Madagascar, Malawi, Malaysia, Maldives, Mali, Malta, Marshall Islands, Mauritania, Mauritius, Mexico, Micronesia, Moldavia (Republic), Monaco, Mongolia, Morocco, Myanmar, Namibia, Nauru, Nepal, New Zealand, Nicaragua, Niger, Nigeria, Niue, Norway, Oman, Pakistan, Palestinian territories, Palau, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Qatar, Romania, Rwanda, Sahara, Samoa, San Marino, Saudi Arabia, Senegal, Seychelles, Sierra Leone, Singapore, Solomon Islands, Somalia, South Africa, Sri Lanka, St. Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Sudan, Suriname, Swaziland, Sweden, Syria, Tajikistan, Taiwan, Tanzania, Thailand, Timor-Leste, Togo, Tonga, Trinidad and Tobago, Turkey, Tunisia, Turkmenistan, Turks and Caicos Islands, Tuvalu, Uganda, Ukraine, United Arab Emirates, United States of America, Uruguay, Uzbekistan, Vanuatu, Vatican City, Venezuela, Vietnam, Yemen, Zambia, Zimbabwe
Annex B Germany, Slovakia
Annex A and Annex B Angola, Austria, Belgium, Bosnia and Herzegovina, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Greece, Hungary, Iceland, Latvia, Liechtenstein, Luxemburg, Macedonia, Montenegro, Netherlands, Poland, Portugal, Russian Federation, Serbia, Slovenia, Spain, Switzerland