Appendix C V.35 Technical Information
ViewStation FX/VS 4000 User’s Guide 170 www.polycom.com
State Machine
The V.35 State Machine describes how the V.35 interface signals
handshake with the network interface equipment during call
establishment.
Dial Out State Machine
State View Station or VS4000 Signals Network Equipment Signals
1 Initial State:
DTR = 0 <note 3>
RTS = 0 <note 2>
CRQ = 0
USER INITIATES CALL
Initial State:
RI = 0
DLO = 0
ACR = 0
DSR = 0
2 DTR = 1<note 3>
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 <note 1>)
13 RTS = 1<note 2>
14 DATA FLOW STARTS DATA FLOW STARTS
User Hang-up Far End Hang-up
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