This read-write value sets the data rate, in bits per second, at the interface, with the description noting that changing it also changes the data rate at the remote counterpart simultaneously since both ends of an HDSL link must run at the same rate. Admins use it to provision the actual throughput of the HDSL circuit, keeping in mind that the change takes effect on both the local and remote modem at once. An admin upgrading a circuit's capacity would change this value, understanding the remote modem's rate updates automatically to match.