PS-SAU-1900E
Mar. 8
th
,1999 (Rev. 0.0)
--- CONFIDENTIAL AND PROPRIETARY ---
24
3.1.2.1. IDLE
State.
To enter the INCOMING CALL state, the LAU must first be operating in the IDLE state. In the IDLE state,
the LAU performs the following repetitive activities:
•
Verifies presence of a valid PILOT and SYNC channel.
•
Monitors for incoming ALERT signal, which would then initiate the INCOMING CALL state.
•
Monitors for input on the Configuration and Maintenance Interface, which would signal transition to
the CONFIGURATION state.
•
Monitors for a transition of the LIU Hookswitch Transition input. Such a transition causes initiation of
the CALL PLACEMENT state.
3.1.2.2.
Ring Treatment and Caller ID Data Transmission.
The LAU enters this substate when an ALERT indication has been detected. The LAU now determines
which type of ring treatment is to be applied over the analog interface, and then transmits the first ring
burst to the interface. Between the first and second ring burst, Caller ID data is transmitted, if present.
This state is maintained until one of several possible events occur:
•
A Hookswitch Transition is detected. In this case, the LAU moves to initiate the Conversation mode.
Figure 3.1.2.a. - High Level State Diagram, INCOMING CALL State.
CONVERSATION
State
Configure
for Voice
Interface
Apply Ring
Treatment
to Analog
Vertical
Features
IDLE
State
Get RING
TREATMENT
Specs.
ALERT = True
OFF_HOOK = False
FLASH_DETECT = True
Generate
CALLER ID
Data
Call
Termination
Procedure
TERMINATION = True
CIDINFO = True
OFF_HOOK = True
