Explication sur test adsl?

Bonjour,j aimerai savoir ce que veux dire ces test et upload et dowload
Câble/ADSL 128k 128 Kbps (IP: 16 Ko/sec - ATM: 20 Ko/sec)
Câble/ADSL 512k 512 Kbps (IP: 64 Ko/sec - ATM: 80 Ko/sec)
Câble/ADSL 1024k 1024 Kbps (IP: 128 Ko/sec - ATM: 160 Ko/sec)
T1 1500 Kbps (IP: 187.5 Ko/sec - ATM: 234.38 Ko/sec)
Câble/ADSL 2M 2000 Kbps (IP: 250 Ko/sec - ATM: 312.5 Ko/sec)
Câble/ADSL 5M 5000 Kbps (IP: 625 Ko/sec - ATM: 781.25 Ko/sec)
ADSL 8M 8000 Kbps (IP: 1000 Ko/sec - ATM: 1250 Ko/sec)
ADSL2+ 10M 10000 Kbps (IP: 1250 Ko/sec - ATM: 1562.5 Ko/sec)
ADSL2+ 15M 15000 Kbps (IP: 1875 Ko/sec - ATM: 2343.75 Ko/sec)
ADSL2+ 20M 20000 Kbps (IP: 2500 Ko/sec - ATM: 3125 Ko/sec)
Bande Passante 3887.009 Kbps (IP: 485.88 Ko/sec - ATM: 607.35 Ko/sec)


Débit ATM Débit IP Débit réel
download = 3.68 Mb/s download = 2.95 Mb/s download = 377 Ko/s
upload = 994 Kb/s upload = 795 Kb/s upload = 99 Ko/s