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===L2 data frames===
The Data Link layer (L2) clusters 17-bit UniPro symbols into packet-like data frames (the term packet is reserved for L3). These data frames start with a 17-bit start-of-frame control symbol, followed by up to 288 bytes of data (144 data symbols) and followed by an end-of-frame control symbol and a checksum
The value of 288 was chosen to ensure that the entire protocol stack could easily transmit 256 bytes of application data in a single chunk. Payload consisting of odd numbers of bytes are supported by padding the frame to an even number of bytes and a corresponding flag in the trailer.
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