Telephone Line Emulator User’s Manual
40-400-00020, Rev. M 22
Open Switch Interval
The Open Switch Interval is a form of DC signaling, sent during an on-hook state, prior to
Visual Message Waiting. During this time, the -48 VDC is momentarily removed. Open
Switch Interval may be set from 0 seconds to 5 seconds in 5 mS increments.
Advanced Screen Telephony
ADSI, also known as Advanced Screen Telephony, a Type III Caller ID sequence, is
supported in the TLE using a special ADSI test number ∗∗99∗∗, which performs a script
download from the TLE. Three data bursts are sent from the TLE, shown in the display as
ADSI_ack1, ADSI_ack2, and ADSI_ack3 to load a script called “Call Management”.
This new service provides a limited script that will display “New Call From” and “Caller
ID”. After answer, the display changes to “Talking To” and “Caller ID” and a button
labeled “Don’t interrupt”. If the button is pressed, the CPE will perform a flash; dial ∗70
to disable Call Waiting and then displays “Call Waiting OFF”.
When the CPE receives a Caller ID during a call, the display will show “New Call From”
and “Caller ID”. The button selection will change to “Connect New Call”. If this button is
pressed, the original caller is placed “On Hold” and the button changes to “Reconnect
1st Call”.
DC Signaling
DC Signaling changes polarity or loop current characteristics of the line. These include
On/Off-Hook Detect Times, Hook Flash Detect Time, Line Reversal, and Forced
Disconnect Length and Delay.
Figure 13. DC Signaling Screen
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