User's Manual

Radio Activity S.r.l. 26 / 44
∞ Audio Line 1 is the audio port for Console; it is a PM (phase modulated = the incoming audio is
emphasized) audio port
∞ Audio Line 2 is the audio port for External modem (e.g.: paging interface); this port is a FM (frequency
modulated = the incoming audio is “flat”) audio port
In digital communication, if the AMBE option board is installed, these ports have the following roles:
∞ Audio Line 1: this port is connected to the DMR timeslot 1.
∞ Audio Line 2: this port is connected to the DMR timeslot 2; it is needed the dual AMBE option
Note that the audio port can be configured in many different modes. For example the Audio Line 1 can be
used to synchronize two base stations through a 2 wire long line.
The audio line settings (levels, filters, PM/FM in-out, …) are modifiable with the setup tool, using the “LINE
setup” mask.
3.4 Option boards
KAIROS has got two internal connectors for placing option boards. The main option boards are:
∞ GPS receiver: embedded receiver for GPS/GLONASS service, with high precision Pulse Per Second
(PPS) output function in order to synchronize the station. Only an external active antenna is required.
This option is required for simulcast and special operations. Place it in “OPTBOARD B” position.
∞ AMBE codec: two DSP, one per timeslot, perform the cross-coding of linear audio (mu-law coded) to
a DMR audio and vice versa. This option is required for SIP/RTP-IP and local audio applications. This
option board can be ordered for 1 or for 2 audio. Place it in “OPTBOARD B” position.
∞ USB port: it allow to connect to KAIROS standard USB devices like Flash Keys and the remote control
modem. Place it in “OPTBOARD A” position.
∞ RS232 port: it allow to connect to KAIROS standard RS232 serial devices like external data logger.
Place it in “OPTBOARD A” position.