| 摘要 |
Streams of data including explicit synchronization patterns (such as entire T1/E1) are transmitted utilizing an unstructured data format, while streams not containing explicit synchronization patterns (such as fractional T1/E1) are sent utilizing a structured data format, i.e., the data structure itself provides for circuit alignment at the receiving end. In addition, SDH VC-12 frames are transmitted over the IP network by encapsulating the entire frame (payload and overhead) into an RTP packet. Furthermore, the clock is reconstructed (clock recovery) from the packet stream at the receiver's side.
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