[ADSL] Synchronization issues: the causes

• The speed synchronization (also called debit ATM).
• The margin of signal noise. To be quite simple, ADSL uses a frequency band. The margin of signal noise is the difference between the highest point of the band, which is deducted the noise on the line. It remains a margin, typically around 10 dB.
• The mitigation. The latter will vary depending on the quality of your telephone line and your connections.

• The telephone extension. Completely banned: to connect your ADSL modem. Indeed, the extension telephone will capture all the noise surrounding your home (and there are many: DECT phone ...). These will create an increase in attenuation on your line, causing a flow is less, a complete loss of signal ADSL.
• Electromagnetic environment. ADSL modems are generally very sensitive to their environment. Avoid close modem: DECT, halogen lamps, loudspeakers, amplifiers ... In short, anything that can emit radiation.
• The ADSL filters. The ADSL filter will allow to separate the frequencies used by ADSL and telephony. It is imperative to install filters to improve your ADSL signal.
• The main outlet. When France Telecom carries out an installation in a habitat, there is always a main outlet, which connects one or more catches. For ADSL, it is always best to connect to the main outlet, with the aim to improve the ADSL signal.