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Integrators' Reference Manual for ViewStation EX, ViewStation FX, and VS4000
40
Table 2-22. Dial-Out State Machine (Continued)
State
15
16
a. DTR does not act as shown but remains high if DTR is set to ON
in the V.35 Advanced Setup screen.
b. RTS does not act as shown but acts as a resync pulse if
Security/Crypto-Resync is set to ON.
c. DSR is used as a ring-in indicate if DSR is set to ANSWER in the
V.35 Advanced Setup screen.
Table 2-23. Inbound Call State Machine
State
1
2
3
4
ViewStation or
VS4000 Signals
b
RTS = 0
a
DTR = 0
CRQ = 0
All signals go low if Far
End or User hang up
is detected
IDLE
a
DTR = 0
b
RTS = 0
CRQ = 0
ViewStation FX or
VS4000 Signals
Initial State:
a
DTR = 0
b
RTS = 0
CRQ = 0
d
Notify user of ring-in
System accepts call
Network Signals
DSR = 1 to 0, OR DCD
= 1 to 0
A falling edge on DSR
or DCD are interpreted
by the ViewStation FX
or VS4000 as a
hang-up
IDLE
RI = 0
DLO = 0
ACR = 0
DSR = 0
Network Signals
Initial State:
RI = 0
DLO = 0
ACR = 0
DSR = 0
REMOTE USER
INITIATES CALL
RI= 0 to 1, or DCD= 0
c
to 1, or DSR= 0 to 1
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