Networked modems configurable to establish a communication system on a wired communication medium. Each modem includes: a network module, transmit and receive path modules and a frequency domain echo canceller. The network module is configured to communicate with network modules of remaining ones of the at least three modems to allocate bandwidth of the shared communications medium for at least two discrete point-to-point communication links between corresponding pairs of the at least three modems. The transmit and receive path modules are configured for multi-tone modulation and demodulation of communications on the wired communication medium and are responsive to the bandwidth allocation of the network module to concurrently process at least a first discrete point-to-point communication link with a first modem among remaining ones of the at least three modems and at least a second discrete point-to-point communication link with a second among remaining ones of the at least three modems. The frequency domain echo canceller is configured to substantially cancel leakage of the communications transmitted on the transmit path into the receive path and to enable each point-to-point communication link to support full duplex communications.