Chapter 2 - Technical Information

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.

Table 2-22. Dial-Out State Machine

 

ViewStation or

 

State

VS4000 Signals

Network Signals

 

 

 

1

Initial State:

Initial State:

 

DTR = 0a

RI = 0

 

RTS = 0b

DLO = 0

 

CRQ = 0

ACR = 0

 

USER INITIATES

DSR = 0

 

CALL

 

 

 

 

2

DTR = 1a

 

3

Wait 10 ms

 

 

 

 

4

CRQ = 1

 

 

 

 

5

 

PND = 1

 

 

 

6

Set Digit

 

 

(NB1,NB2,NB3,NB4)

 

 

 

 

7

DPR = 1

 

 

 

 

8

 

PND = 0

 

 

 

9

DPR = 0

 

 

 

 

10

If not last digit, go to

 

 

state 4; else continue

 

 

 

 

11

 

Call connects on

 

 

network

 

 

 

12

 

DSR = 1 AND/OR

 

 

DCD = 1

 

 

(AND/OR DSR = 1 c

13

RTS = 1b

 

14

DATA FLOW STARTS

DATA FLOW STARTS

 

 

 

 

User Hang-up

Far end hang-up

 

 

 

© Polycom, Inc.

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Polycom EX, FX, VS4000, EX4000, FX4000, VS4000 manual State Machine, ViewStation or State VS4000 Signals Network Signals

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