Polycom EX, FX, VS4000 manual State Machine, ViewStation or State VS4000 Signals Network Signals

Chapter 2 - Technical Information

State Machine

The V.35/RS-449/RS-530 state machine controls how the V.35/RS-449/RS-530 interface signals handshake with the network interface equipment while the call is being established. The following tables describe the machine states.

Table 2-22. Dial-Out State Machine

	ViewStation or
State	VS4000 Signals	Network Signals
1	Initial State:	Initial State:
	DTR = 0a	RI = 0
	RTS = 0b	DLO = 0
	CRQ = 0	ACR = 0
	USER INITIATES	DSR = 0
	CALL
2	DTR = 1a
3	Wait 10 ms
4	CRQ = 1
5		PND = 1
6	Set Digit
	(NB1,NB2,NB3,NB4)
7	DPR = 1
8		PND = 0
9	DPR = 0
10	If not last digit, go to
	state 4; else continue
11		Call connects on
		network
12		DSR = 1 AND/OR
		DCD = 1
		(AND/OR DSR = 1 c
13	RTS = 1b
14	DATA FLOW STARTS	DATA FLOW STARTS
	User Hang-up	Far end hang-up

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