It means that the hardware configuration is designed to cope satisfactorily with the data throughput corresponding to peaks in the demand. That can be achieved by increasing the data-rate, and/or (as here) by splitting the total throughput between 8 parallel channels (modems).

Read about throughput here: https://en.wikipedia.org/wiki/Throughput

Depending on how the throughput is defined/measured, the ST may be referring to the PIR (or perhaps the CIR), discussed here: https://en.wikipedia.org/wiki/Peak_information_rate , or to some other objective measurement.