Nondialed network-initiated call state machine – Polycom ViewStation User Manual
Page 214
Appendix C
V.35 Technical Information
ViewStation User Guide
198
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Nondialed Network-Initiated Call State Machine
Note 1: DSR is used as a ring-in indicator 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.
State
ViewStation Signals
Network Equipment Signals
1
Initial State:
DTR = 0
RTS = 0
CRQ = 0
Initial State:
RI = 0
DLO = 0
ACR = 0
DSR = 0
USER INITIATES CALL
2
DCD = 0 to 1
3
DTR = 1 4 RTS = 1 5 DATA FLOW STARTS DATA FLOW STARTS User Hang-up Far End Hang-up 6 RTS = 0 All signals go low if Far End or User hang-up is DSR= 1 to 0, OR DCD= 1 to 0 A falling edge on DSR or DCD is interpreted by 7 IDLE IDLE
DTR = 0
CRQ = 0
detected.
the ViewStation as a hang-up.
DTR = 0
RTS = 0
CRQ = 0
RI = 0
DLO = 0
ACR = 0
DSR = 0