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Envoy ACP/XF Application Programming Manual

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Asynchronous Balanced Mode (ABM) Protocols
EnvoyACP/XF Application Programming Manual–132179
2-9
Reject (REJ)
Reject (REJ)
The REJ command or response indicates that the specified I-frame was received in error
and requests retransmission of the indicated I-frame(s) and all subsequent I-frames. For
modulo-8 frame sequencing, this type of error recovery causes EnvoyACP/XF to
retransmit at most seven frames. For modulo-128 frame sequencing, however, the REJ
command or response can introduce substantial inefficiency.
Figure 2-4. Two Retry Count Variables
015
Retry Count = 3
WRITE Operation Issued
Send I-Frame
Send RR,P
Send I-Frame
(No Response; Timeout)
(RR,F Received)
(No Response; Timeout)
(RR,F Received)
WRITE Operation Aborted with File-System Error Code 162.
Send RR,P
RR Frame
Retry Count
1
0
0
1
Send I-Frame
Send RR,P
Send RR,P
(No Response; Timeout)
(No Response; Timeout)
(RR,F Received)
(No Response; Timeout)
Send I-Frame
1
0
2
0
3
2
1
0
I Frame
Retry Count