參數(shù)資料
型號: MA28140
廠商: Dynex Semiconductor Ltd.
英文描述: Packet Telecommand Decoder
中文描述: 包遙控解碼器
文件頁數(shù): 11/72頁
文件大小: 857K
代理商: MA28140
MA28140
11/72
Figure 5: The FARM Sliding Window Concept
NS=VR+1
N(S)=V(R)
NS=VR+PW1
NS=VR-NW
N(S)=V(R)-1
DISCARD FRAME &
SET RETRANSMIT
FLAG
DISCARD
FRAME & GO TO
LOCKOUT
STATE
DISCARD FRAME
FRAME &
SET V(R)=V(R)+1
POSITIVE WINDOW AREA = PW
L
NEGATIVE WINDOW AREA = NW
A Frame Sequence Number N(S) falls outside the FARM Sliding Window i.e. in the Lockout Area when:
N(S)>V(R)+PW-1
N(S)<V(R)-NW
In this case, the Lockout flag is set.
When N(S) falls inside the FARM Sliding Window, one of the following three cases can occur:
First case
N(S)=V(R)
The frame is accepted
Second Case
N(S)>V(R) and
N(S)
V(R)+PW-1
The frame is in the positive window and does not contain the expected Frame Sequence Number. The Frame is discarded
and the retransmit Flag is set.
Third Case
N(S)<V(R) and
N(S)
V(R)-NW
The frame is in the negative window and is discarded without any other action being taken.
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