COMMUNICATIONS NETWORK

摘要

A PON in which parallel optical fibre paths are provided between dual OLTs and the ONTs, one of the optical fibre paths providing an active connection and the other optical fibre path providing a standby connection. Respective VLANs may be formed over the parallel optical fibre paths. If performance indicators, for example Ethernet continuity check messages, indicate that an ONT is no longer in communication with the OLT then data may be sent via the VLAN associated with the standby connection.