Appendix C V.35 Technical Information
ViewStation FX/VS 4000 User’s Guide 172 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.
Non-dialed User Initiated Call State Machine
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
State ViewStation FX or VS4000 Signals Network Equipment Signals
1 Initial State:
DTR = 0 <note 3>
RTS = 0 <note 2>
CRQ = 0
Initial State:
RI = 0
DLO = 0
ACR = 0
DSR = 0
USER INITIATES CALL
2 DTR = 1<note 3>
3 RTS = 1<note 2>
4 DCD = 0 to 1
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