Task Manager Examples - Tait TB8100 User Manual

Task Manager Examples

Repeater Changeover
Data and Speech Service
TB8100 Service Kit User's Manual
Task Manager makes it possible for you to build complex functions into the
base station. Here are some examples of to give you an idea of what can be
done.
Important: While Tait has carefully tested Task Manager, no
guarantee can be given that these examples will work correctly for
your system. Make sure that you thorougly test any set of Task
Manager tasks before commissioning the system.
A line-controlled base station is connected to a console that provides tone on
idle. The following Task Manager tasks automatically convert the TB8100 to a
talk-through repeater if the line fails. When the line is re-established, the
TB8100 reverts to line-controlled operation.
IF Base station in Run mode THEN Disable talk through repeater.
This disables the base station's talk through repeater mode whenever it enters
Run mode.
IF Balanced input low THEN Enable talk through repeater.
IF Balanced input low THEN Disable line-controlled base station.
IF Balanced input low THEN Start over the air alarm.
If the line fails, the input line level falls below the prescribed minimum. This
triggers Task Manager actions that switch off the line-controlled base station
mode, enable the talk through repeater mode, and start sending alarm pips over
the air.
IF NOT Balanced input low THEN Disable talk through repeater.
IF NOT Balanced input low THEN Enable line-controlled base
station.
IF NOT Balanced input low THEN Stop over the air alarm.
When the line is re-established, Task Manager actions re-establish the line-
controlled base station function and stop the alarm.
A repeater needs to relay speech as well as data. The speech needs to be pre-
emphasised while the data needs the full band from < 50 Hz to 3000 Hz.
Speech is sent with a CTCSS tone.
The base station needs to be able to automatically change between repeating
pre-emphasised audio and repeating full band audio.
To achieve this, follow these steps:
1. Set up Channel 1 as a speech repeater. The channel profile (Signal Path tab)
is set to De-emph Speech Band / Pre-emph Speech Band.
2. Set up Channel 2 as a data repeater. The channel profile (Signal Path tab) is
set to Flat Full Band.
3. Set Timer 1 to 150 milliseconds, corresponding to the time that the base
station needs to decode subaudible signalling.
Task Manager Examples 193