Patent ID: 7382789

Claim:
A data transmission apparatus used in a packet-based node of a multiple service ring including at least two packet-based nodes, said apparatus comprising: a first working ring input for receiving data frames including a destination node address, a tributary service type and port identifier indicating a tributary service type and port of a destination tributary, and a first actual data, from a first upstream neighbor node; a first RX framing means for deframing said data and extracting said destination node address, said tributary service type and port identifier, and the first actual data; a first RX filtering means for identifying whether said data are for the local node according to said destination node address; a first receiving service processing means for determining the service type destined for said data based on said tributary service type and port identifier when said data are for the local node; a tributary TX framing means for converting said data to a format of a service specified by said tributary service type; and a plurality of tributary ports for outputting the converted data, and said converted data being output to one of said tributary ports which is designated by said tributary service type and port identifier.