| 摘要 |
Signal frames are formatted to include a port identifier (28) for identifying sources and/or intended recipients in a point to multi-point system. In one embodiment, a port identifier (28) is appended to the data portion of the frame (12), e.g., the protocol data unit (PDU) (30) portion of a frame (12). In another embodiment, the port identifier (28) is appended to the header portion of the frame. The system and method are particularly applicable to communications between a cable modem and cable modem (CM) termination system (CMTS) conforming to the data over cable service interface specification (DOCSIS).
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