Tait TM8000 Series, Applications Manual

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TM8000 3DK Hardware Developer’s Kit Application Manual Programmable I/O Lines 83
September 2003 © Tait Electronics Ltd
Rx/PTT Type
The radio can be programmed to tap into and out of the respective audio
path, when the radio is receiving or transmitting (initiated by one of the
PTTs).
Tap Out and Tap In
Points and Types
Table 3.8 lists the available tap points and the tap types available for them.
The tap points and tap types are illustrated in Figure 3.14 .
Select a tap out point to feed audio to an application device, and a tap in
point to feed audio from an application device.
Important
Do not use ‘Bypass Out’ on R1, R2 and R4 with subaudi-
ble or inband signalling schemes, as this may prevent correct
operation of the signalling decoder.
The same tap point can be selected for both tap in and tap out. This is
referred to as a ‘Splice’ tap type as it allows an audio processing device to be
inserted into the radio’s audio path. This tap type is primarily used for
encryption applications (refer to
“Encryption Module (Scrambler)” on
page 107 ).
The ‘Combine’ tap type is intended for the injection of sidetone beeps into
the Rx path.