Polycom ViewStation - Manual (Page 210)

Appendix C V.35 Technical Information
ViewStation User Guide 194 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 ViewStation 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 the last digit, go to state 4 otherwise
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