Described is a method of managing the bonding of transmissions over a legacy transmission system and over a new transmission system, the legacy transmission system comprising a legacy Cable Modem Termination System (CMTS), the new transmission system comprising a new CMTS and configured to transmit data using a new mode, the method comprising: receiving data at the new CMTS, the data comprising an identification of a receiver as a destination for the data, the legacy receiver configured to receive data transmitted using the legacy mode; monitoring an output of the legacy CMTS; and determining, based on the monitored output, whether to route the data to the legacy CMTS to transmit to the receiver.