DS0             64.00  kbps
DS1/T1/VC12      1.544 Mbps
DS2/T2           6.312 Mbps
DS3/T3/VC3      44.736 Mbps
T4             274.176 Mbps
OC1             51.840 Mbps
OC3/STM1/VC4   155.520 Mbps
OC9/STM3       466.560 Mbps
OC12/STM4      622.080 Mbps
                

Enter the numeric value for the GB/Month or Mb/second into the top text field to the left, and choose the calculation you wish to perform.