Final Status Field (FSF)
The FSF (LCS bits 3 - 6) gives further status information. The encoding is based upon the ISF configura-
tion and is defined as follows:
Initial Status = B'0xx'
┌─────────────────────┬──────────────────────────────────────────────┐
│ ISF
FSF
F │
│
│
│
│
│ ð 1 2
3 4 5 6
7 │ Meaning
│
├─────────────────────┼──────────────────────────────────────────────┤
│ ð x x
ð ð ð ð
x │ Timeout occured after reception has begun and│
│
│
ISF is not ððð
│
│ ð x x
ð ð 1 1
x │ ENQ received
│
│ ð x x
ð 1 ð ð
x │ EOT received
│
│ ð x x
ð 1 ð 1
x │ DLE/xxx was received (xxx=any valid second
│
│
│
character)
│
│ ð x x
ð 1 1 ð
x │ Wrong ACK received
│
│ ð x x
ð 1 1 1
x │ NAK received
│
│ ð x x
1 ð ð 1
x │ ETX received
│
│ ð x x
1 ð 1 ð
x │ ETB received
│
│ ð x x
1 1 ð 1
x │ RVI received
│
│ ð x x
1 1 1 ð
x │ Positive ACK (ð or 1) received
│
│ ð x x
1 1 1 1
x │ WACK received
│
└─────────────────────┴──────────────────────────────────────────────┘
Initial Status = B'100' (Special)
┌─────────────────────┬──────────────────────────────────────────────┐
│ ISF
FSF
F │
│
│
│
│
│ ð 1 2
3 4 5 6
7 │ Meaning
│
├─────────────────────┼──────────────────────────────────────────────┤
│ 1 ð ð
ð ð ð ð
x │ Timeout (nothing received); ACR, COS, DLO, or│
│
│
PND failed to drop; X.21 timeout on ready
│
│
│
for data
│
│ 1 ð ð
ð ð ð 1
x │ Ending condition on start/stop
│
│ 1 ð ð
ð ð 1 ð
x │ X.21 timeout during clear
│
│ 1 ð ð
ð ð 1 1
x │ 386x/58xx test control active/X.21 timeout
│
│
│
on proceed to select
│
│ 1 ð ð
ð 1 ð ð
x │ DLE-EOT disconnect sequence received
│
│ 1 ð ð
ð 1 ð 1
x │ Lost data
│
│ 1 ð ð
ð 1 1 ð
x │ Poll entry too long
│
│ 1 ð ð
1 1 ð ð
x │ EOT transmitted
│
│ 1 ð ð
1 1 ð 1
x │ X.21 call progress signal (CPS) error
│
│ 1 ð ð
1 1 1 ð
x │ Disconnected/X.21 DCE clear received
│
│ 1 ð ð
1 1 1 1
x │ Connected
│
└─────────────────────┴──────────────────────────────────────────────┘
Notes:
1. When a special status occurs, the line is set to the disable state.
2. For X.21, if 'DTE clear' or 'DCE clear' confirmation is required, the 'X.21 timeout during clear' flag (bit
7) is added to the final status to indicate the result of the clear operation. Bit 7 is set to zero if the
clear was successful, and to one if it was not.
Chapter 5. High Performance Transmission Subsystem (HPTSS)
5-33
Содержание 3745 Series
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Страница 255: ...The HPTSS in 3745 Models 130 150 160 and 170 Data Flow Chapter 5 High Performance Transmission Subsystem HPTSS 5 3 ...
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