Polycom ViewStation EX4000 - Manual (Page 51)

Chapter 2 - Technical Information
© Polycom, Inc. 41
5 DTR = 1
6 RTS = 1 b
7 Wait for DSR high
8 DSR = 1 AND/OR
DCD = 1 (AND/OR
DSR = 1
c )
9 Go to connected state
10 DATA FLOW STARTS DATA FLOW STARTS
11 User Hang-up Far End Hang-up
12 RTS = 0 b
DTR = 0 a
CRQ = 0
All signals go low if Far
End or User hang up
is detected
DSR= 1 to 0, OR
DCD= 1 to 0 OR CTS=
1 to 0
A falling edge on DSR
or DCD or CTS is
interpreted by the
FX/VS4000 as a
hang-up
e
13 IDLE
DTR = 0
a
RTS = 0 b
CRQ = 0
IDLE
RI = 0
DLO = 0
ACR = 0
DSR = 0
a. DTR does not act as shown but remains high if DTR is set to ON
in the V.35 Advanced Setup screen.
b. RTS does not act as shown but acts as a resync pulse if
Security/Crypto Resync is set to ON.
c. DSR is used as a ring-in indicate if DSR is set to ANSWER in the
V.35 Advanced Setup screen.
d. If RS-366 Dialing is not enabled, auto answer must be enabled.
If auto answer is not enabled, ring-in will be ignored when in
non-dialed mode.
e. If DCD filter is set to ON in the V.35 Advanced Setup screen,
the system will not react to a low DCD until DCD has been low for
60 seconds.
Table 2-23. Inbound Call State Machine (Continued)
State
ViewStation FX or
VS4000 Signals
Network Signals