| 摘要 |
Conventionally, since in an ADM apparatus being an interface apparatus between a DS3 network and a SONET network a DS3 frame is mapped into an STS1 frame, the multiplexing and demultiplexing of the STS1 frame has to be carried out in units of DS3 frames. For this reason, the DS3 frame is demultiplexed and converted to a DS2 frame, and then to a DS1 frame, the DS1 frame is multiplexed and converted to a VT1.5 frame, and this VT1.5 frame is mapped into an STS1 frame. Since the VT1.5 frame is synchronized with the STS1 frame, the multiplexing and demultiplexing processes can be carried out in smaller units of the VT1.5 frame. Accordingly, data can be distributed on smaller units on a network.
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