Protocol: ISO 8073 / TP TP PCI / Überblick
Field: length indicator (LI)
Length: 1 byte
Contents: length of TPDU.
The length indicator is found in the first octet being a binary value covering the TPDU header (LI field and user data field excluded [if any] ).
> max. value: 254 (binary 11111110).
> value 255 (binary 11111111) is reserved for possible extensions.
The substraction (LI)-(length of fixed part) indicates the variable part's length (if any exists). The variable part's length indicates how many parameters the variable part may contain.