Polycom ViewStation manual Nondialed User-Initiated Call State Machine

Appendix C V.35 Technical Information

Nondialed User-Initiated Call State Machine

State

ViewStation Signals

Network Equipment Signals

1	Initial State:	Initial State:
	DTR = 0 <note 3>	RI = 0
	RTS = 0 <note 2>	DLO = 0
	CRQ = 0	ACR = 0
		DSR = 0
	USER INITIATES CALL
2	DTR = 1<note 3>
3	RTS = 1<note 2>
4		DCD = 0 to 1
5	DATA FLOW STARTS	DATA FLOW STARTS
	User Hang-up	Far End Hang-up
6	RTS = 0 <note 2>	DSR= 1 to 0, OR DCD= 1 to 0
	DTR = 0 <note 3>	A falling edge on DSR or DCD is interpreted by
	CRQ = 0
		the ViewStation as a Hang-up.
	All signals go low if Far End or User hang-up is
		<note 4>
	detected.
7	IDLE	IDLE
	DTR = 0 <note 3>	RI = 0
	RTS = 0 <note 2>	DLO = 0
	CRQ = 0	ACR = 0
		DSR = 0

Note 1: DSR is not 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.

© Polycom, Inc. 197 ViewStation User Guide