Table 2-25. Non-Dialed Network-Initiated Call State Machine - Polycom SoundStation2 EX, FX, VS4000 Integrator's Reference Manual

© Polycom, Inc.

Table 2-25. Non-dialed Network-Initiated Call State Machine

State
1
2
3
4
5
6
7
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. If DCD filter is set to ON in the V.35 Advanced Setup screen,
the system does not react to a low DCD until DCD has been low
for 60 seconds.
Chapter 2 - Technical Information
ViewStation FX or
VS4000 Signals
Initial State:
a
DTR = 0
b
RTS = 0
CRQ = 0
a
DTR = 1
b
RTS = 1
DATA FLOW STARTS
User hang-up
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
Network Signals
Initial State:
RI = 0
DLO = 0
ACR = 0
DSR = 0
USER INITIATES
CALL
DCD = 0 to 1
DATA FLOW STARTS
Far end hang-up
DSR= 1 to 0, or DCD=
1 to 0
A falling edge on DSR
or DCD is interpreted
by the FX/ VS4000 as
a hang-up
c
DCD= 0
IDLE
RI = 0
DLO = 0
ACR = 0
DSR = 0
43