Hytera PD78XG System Planner

Hytera DMR System Planner
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2.10 Back-to-Back
The “back-to-back” is a system solution based on accessory pin. It is used to
achieve cross-band communication among analog and digital terminals. There are
two methods of back-to-back solution provided by Hytera:
 Back-to-back Mobile Radio
 Back-to-back Repeaters
2.10.1 Mobile Radio Accessory Pin
Input
On both analog and digital channels, the mobile radio can trigger or terminate the
transmission via the accessory pin, and the audio signals to be transmitted will be
sampled via the input pin as well.
Function Type Applicable
Mode
Definition
EXT Mic PTT
(via
accessory
PTT)
A fixed
function
Analog and
Digital
When a valid level is input, the mobile
radio will trigger its external PTT and
transmit the audio signal sampled
from Codec. However, the
transmission will be stopped in case
of invalid level.
Tx Audio
(via external
MIC signal)
A fixed
function
Analog and
Digital
When the external PTT is enabled,
the mobile radio will transmit the
audio signals.
Output
On both analog channel and digital channels, the mobile radio can output (in level
form) the status of call request as well as the call contents from the portable radio
via the accessory pin. The definition of involved pins is given below:

Hytera PD78XG Specifications

General

Brand	Hytera
Model	PD78XG
Category	Portable Radio
Language	English