State Machine; Table 2-22. Dial-Out State Machine - Polycom SoundStation2 EX, FX, VS4000 Integrator's Reference Manual

State Machine

© Polycom, Inc.
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.

Table 2-22. Dial-Out State Machine

State
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Chapter 2 - Technical Information
ViewStation or
VS4000 Signals
Initial State:
a
DTR = 0
b
RTS = 0
CRQ = 0
USER INITIATES
CALL
a
DTR = 1
Wait 10 ms
CRQ = 1
Set Digit
(NB1,NB2,NB3,NB4)
DPR = 1
DPR = 0
If not last digit, go to
state 4; else continue
b
RTS = 1
DATA FLOW STARTS
User Hang-up
Network Signals
Initial State:
RI = 0
DLO = 0
ACR = 0
DSR = 0
PND = 1
PND = 0
Call connects on
network
DSR = 1 AND/OR
DCD = 1
c
(AND/OR DSR = 1
DATA FLOW STARTS
Far end hang-up
39