Patent ID: 7489697

Claim:
An unidirectional ring system used in an indoor backbone network, comprising: a residential gateway (RG) for connection to an external large-capacity network; a service gateway (SG) coupled to the RG for serving as a clock master to synchronize clock signals in the system, for managing traffic and buses in the indoor backbone network, and for monitoring the physical states of transmission lines in the indoor backbone network; a plurality of service platforms (SPs) for exchanging user data between a user and the indoor backbone network, and a detachable service adapter (SA), which is coupled to a device servicing each user, in each of the SPs, for connecting a user cluster network with a corresponding SP and providing various services to the user, wherein the SG and the plurality of SPs serve as each node and form a unidirectional ring structure, and each of the SPs is configured to connect its respective SA to the backbone network so that an event and a service do not influence the backbone network.