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Observing the ADSL Parameters
Following the return softkey on the left, one can start a NEW test, STOP the current test, or
enter the MENU to start an an IP ping test or setting various parameters. The main menu entries
will be detailed on the following slides. When pressing the pulse key, the different ADSL
parameters are shown.
bits / tone
SNR / tone
Typical values for the ADSL
parameters are as follows:
SNR margin >6 dB
downstream att. ~10 dB/km
upstream attenu. ~5 dB/km
dwn/upstream att. ratio with
Annex A ~2:1
SNR = signal to noise ratio; FEC = corrected transmission errors on ADSL layer; CRC =
transmission errors on ADSL layer; HEC = ATM cells with erroneous header checksum
17


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