Protection Length mask mask cont. (present only when L = 1) The protection length field and the mask field have the same meaning as defined in [RFC5109]. FEC Level Extension Header This protocol defines a FEC level extension header between the FEC level header and FEC level payload. 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 A B C D E F G Reserved2 (optional) ... Version field. It indicates whether Reserved2 field is present. A - V (1 bit): B - C (1 bit): C field. This field MUST be set to 0. C - HR1 (1 bit): Header recovery bit1 field. It is used to store the one bit in the FEC protection string. D - HR2 (1 bit): Header recovery bit2 field. It is used to store the one bit in the FEC protection string. E - Reserved (4 bits): Reserved for future use. It MUST be set to 0. F - FEC Count (4 bits): The number of FEC packets generated by a protection operation. G - FEC Index (4 bits): The index of an FEC packet in all the FEC packets generated by a protection operation. The value ranges from 0 to 15. At most 15 FEC packets can be generated by one protection operation. Reserved2 (4 bytes, optional): Reserved for future use. It is present only when V field is 1.
Protection Length mask mask cont. (present only when L = 1) The protection length field and the mask field have the same meaning as defined in [RFC5109]. FEC Level Extension Header This protocol defines a FEC level extension header between the FEC level header and FEC level payload. 0 1 2 3 4 5 6 7 8 9 1 0 1 2 3 4 5 6 7 8 9 2 0 1 2 3 4 5 6 7 8 9 3 0 1 A B C D E F G Reserved2 (optional) ... A - V (1 bit): Version field. It indicates whether Reserved2 field is present. B - C (1 bit): C field. This field MUST be set to 0. C - HR1 (1 bit): Header recovery bit1 field. It is used to store the one bit in the FEC protection string. D - HR2 (1 bit): Header recovery bit2 field. It is used to store the one bit in the FEC protection string. E - Reserved (4 bits): Reserved for future use. It MUST be set to 0. F - FEC Count (4 bits): The number of FEC packets generated by a protection operation. G - FEC Index (4 bits): The index of an FEC packet in all the FEC packets generated by a protection operation. The value ranges from 0 to 15. At most 15 FEC packets can be generated by one protection operation. Reserved2 (4 bytes, optional): Reserved for future use. It is present only when V field is 1.