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T4 delayed?
Yes
2
No
No
3s delayed?
Signal gone?
Yes
1
Transmit
DCN
3
Disconnect
the line
200 ms
delay?
2
Return "No"
T4=4.5s 15%,manual units
T4=3.0s 15%,automatic units
RESPONSE
REC?
Enter
No
No
Flag?
Yes
Receive a
frame?
Yes
FCS error?
No
Yes
Yes
CRP?
No
DCN?
No
No
Optional
response?
Yes
No
Return "Yes"
Fig. A-57 Response Reception Procedure
No
Yes
Signal gone?
Yes
No
200 ms
delay?
Yes
3
Yes
Process optional
response
1
2
3
4
No
5
No
3 second
delayed?
Yes
6
1
Yes
2
A
çi
A–63
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