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Appendix C V.35 Technical Information
ViewStation User Guide 196 www.polycom.com
Note 1: DSR is used as a ring-in indicate if DSR is set to ANSWER
in the V.35 Advanced Configuration screen.
Note 2: RTS does not act as shown but act 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 is
DTR is set to ON in the V.35 Advanced Configuration screen.
State ViewStation Signals Network Equipment Signals
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
15 RTS = 0 <note 2>
DTR = 0 <note 3>
CRQ = 0
All signals go low if Far End or User hang-up is
detected.
DSR= 1 to 0, OR DCD= 1 to 0
A falling edge on DSR or DCD is interpreted by
the VS4000 as a hang-up.
IDLE
DTR = 0 <note 3>
RTS = 0 <note 2>
CRQ = 0
IDLE
RI = 0
DLO = 0
ACR = 0
DSR = 0