This read-write value sets the data rate, in bits per second, at the modem interface. Because the two ends of a GM-H modem pair operate as a matched link, changing this value on one modem automatically changes the data rate at the remote counterpart too, so admins only need to configure it once per link. For example, an admin raising this value to increase throughput on a leased line would see the remote modem's rate update to match, keeping both ends synchronized without a separate configuration step.