PS-SAU-1900E
Mar. 8
th
,1999 (Rev. 0.0)
--- CONFIDENTIAL AND PROPRIETARY ---
26
3.1.3.1. IDLE
State.
Previously defined.
3.1.3.2.
Dial Tone and Digit Collection.
The LAU enters this substate when an Off Hook condition has been detected. The LAU now determines
which type of dial tone treatment is to be applied over the analog interface. Possible dial tones are:
•
Country-specific standard dial tone.
•
Stutter dial tone (for Message Waiting configurations).
•
Fast dial tone (no service available).
Dial tone is provided until the LAU detects a dialed DTMF digit from the analog interface, or until an On
Hook condition is detected, or until the Receiver On Hook timer expires.
3.1.3.3.
Gather Dialed Digits Substate.
The LAU begins gathering digits immediately upon detection of the first DTMF input from the analog loop
interface. Detection and decoding is taken care of by hardware DTMF detection circuitry which is located
in the LIU module. The following general digit gathering scheme is used.
Figure 3.1.3.a. - High Level State Diagram, CALL PLACEMENT State.
CONVERSATION
State
Configure
for Voice
Interface
Call
Connect.
Vertical
Features
IDLE
State
Gather
Dialed
Digits data.
OFF_HOOK = True
FLASH_DETECT = True
Call
Termination
Procedure
TERMINATION = True
CONNECT = True
Apply Dial
Tone
Treatment.
NTWK_SYNC = True
NTWK_SYNC = False
ON_HOOK = True
ON_HOOK = True
ON HOOK = True
