header length | code credit | TPDU-NR and EOT | user data |
一个字节 | 一个字节，code占高四位，credit占低四位 | 一个字节 | n个字节 |
After the credit field (which is always ZERO on output and ignored
on input), there is one additional field prior to the user data.TPDU-NR and EOT 8 bits Bit 7 (the high-order bit, bit mask 1000 0000) indicates the end of a TSDU. All other bits should be ZERO on output and ignored on input.Note that the TP specification limits the size of an expedited
transport service data unit (XSDU) to 16 octets.
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