Polycom EX Manual De Usuario
Chapter 2 - Technical Information
© Polycom, Inc.
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State Machine
The V.35/RS-449/RS-530 state machine controls how the
V.35/RS-449/RS-530 interface signals handshake with the network
interface equipment while the call is being established. The
following tables describe the machine states.
V.35/RS-449/RS-530 interface signals handshake with the network
interface equipment while the call is being established. The
following tables describe the machine states.
Table 2-22. Dial-Out State Machine
State
ViewStation or
VS4000 Signals
VS4000 Signals
Network Signals
1
Initial State:
DTR = 0
DTR = 0
a
RTS = 0
b
CRQ = 0
USER INITIATES
CALL
USER INITIATES
CALL
Initial State:
RI = 0
DLO = 0
ACR = 0
DSR = 0
RI = 0
DLO = 0
ACR = 0
DSR = 0
2
DTR = 1
a
3
Wait 10 ms
4
CRQ = 1
5
PND = 1
6
Set Digit
(NB1,NB2,NB3,NB4)
(NB1,NB2,NB3,NB4)
7
DPR = 1
8
PND = 0
9
DPR = 0
10
If not last digit, go to
state 4; else continue
state 4; else continue
11
Call connects on
network
network
12
DSR = 1 AND/OR
DCD = 1
(AND/OR DSR = 1
DCD = 1
(AND/OR DSR = 1
c
13
RTS = 1
b
14
DATA FLOW STARTS
DATA FLOW STARTS
User Hang-up
Far end hang-up