Non-Dialed Network Initiated Call State Machine - Polycom ViewStation FX User Manual

Appendix C
5 DATA FLOW STARTS
User Hang-up
6 RTS = 0 <note 2>
DTR = 0 <note 3>
CRQ = 0
All signals go low if Far End or User hang up is
detected
7 IDLE
DTR = 0 <note 3>
RTS = 0 <note 2>
CRQ = 0

Non-dialed Network Initiated Call State Machine

State ViewStation FX or VS4000 Signals
1 Initial State:
DTR = 0 <note 3>
RTS = 0 <note 2>
CRQ = 0
2
3 DTR = 1<n
4 RTS = 1<note 2>
5 DATA FLOW STARTS
© Polycom, Inc.
Note 1: DSR is not used as a ring-in indicate if DSR is set to
ANSWER in the V.35 Advanced Configuration screen.
Note 2: RTS does not act as shown but acts as a resync-pulse if
Security/Crypto-Resync is set to ON.
Note 3: DTR does not act as shown but remains at a high voltage if
DTR is set to ON in the V.35 Advanced Configuration screen.
Note 4: If DCD filter is set to ON in the V.35 Advanced Configuration
Screen, the system does not react to a low DCD until DCD has been
low for 60 seconds.
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 ViewStation FX or VS4000 as a Hang-up.
<note 4>
IDLE
RI = 0
DLO = 0
ACR = 0
DSR = 0
Network Equipment Signals
Initial State:
RI = 0
DLO = 0
ACR = 0
DSR = 0
USER INITIATES CALL
DCD = 0 to 1
DATA FLOW STARTS
173 ViewStation FX/VS 4000 User's Guide
V.35 Technical Information