How adsl modem carry high bandwidth traffic?

ADSL modems carry high bandwidth traffic by using a technique called frequency division multiplexing. This allows the modem to split the available bandwidth into separate channels: one for upstream data and multiple for downstream data. By utilizing higher frequency ranges for downstream traffic, ADSL can achieve faster speeds while still allowing voice signals to be transmitted simultaneously over the same phone line. This efficient use of the existing copper infrastructure enables high data rates without requiring significant upgrades.