Optionally used (class 4). This parameter contains a copy of the information received in an AK TPDU, to allow the transmitter of the AK TPDU to be certain of the state of the receiving transport entity.
CODE: 1000 1100
LENGTH: 8
VALUE: 1. Lower window edge (32 bits). Bit 8 of octet 1 of the
parameter value field is set to zero, the remainder
contains the YR-TU-NR value of the received AK TPDU.
When the format has been selected, only the least
significant seven bits (bits 1 to 7 of octet 4 of the
parameter value field) of this field are significant.
2. Your subsequence (16 bits). Contains the value of the
subsequence parameter of the received AK TPDU, or zero
if this parameter was not present.
3. Your credit (16 bits). Contains the value of the CDT
field of the received AK TPDU. When normal format has
been selected, only the least significant four bits
(bits 1 to 4 of octet 2 of the Your Credit field) of
this field are significant.