6100 ADCCP Programming Manual

Link States and Transitions
ADCCP/X21 Protocol Module
069225 Tandem Computers Incorporated 3–11
Figure 3-4. X.21 Link States During Quiescence
DTE Not Ready,
Uncontrolled
DTE Ready
1
DTE Ready
DCE Ready
DTE
t = 1,
r = 1,
c = Off
i = Off
14
DTE Not Ready,
Controlled
DCE Ready
t = 01,
r = 1,
c = Off
i = Off
24
DTE Not Ready,
Uncontrolled
DCE Ready
t = 0,
r = 1,
c = Off
i = Off
DTE
DCE
Ready
23
DTE Not Ready,
Controlled
DCE Not Ready
t = 01,
r = 0,
c = Off
i = Off
22
DTE Not Ready,
Uncontrolled
DCE Not Ready
t = 0,
r = 0,
c = Off
i = Off
DTE
DTE
18
DTE Ready
DCE Not Ready
t = 1,
r = 0,
c = Off
i = Off
DTE Not Ready,
Controlled
DCE
Not
Ready
DCE DCE DCE
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