Analog Gateway to MOTOTRBO™ Connect Plus
When the DVU-2 is interfaced to the Motorola™ XRT 9000 it allows voice interface to a talk group. When a selected talk group becomes active, the XRT 9000 transports the talk group digital audio to the DVU-2 where it is converted to analog voice and made available as a 2-wire or 4-wire Type II E&M interface. Each DVU-2 can interface two external analog devices to two talk groups.
DVU-2 accesses, and registers with, an XRT 9000 via IP for an audio connection to a preset in the XRT 9000 talk group. Channels 1 & 2 in the DVU-2 corresponds to channels 1 & 2 in the XRT 9000. These channels are preset to a radio talk group in the XRC 9000 Controller and correspond directly.
When the DVU-2 accesses the XRT 9000 and gets a valid logon, the connection is ready to operate. If the radio talk group becomes active, digital audio is sent to the DVU-2 from the XRT 9000. This audio is AMBE+2™ encoded and configured as a Connect Plus packet. The DVU-2 decodes each digital audio packet and converts to analog where is sent out on the 2-wire or 4-wire type II E&M interface.
In the case of 4-wire, the E and M leads are used to control the talk group access. When the call originates at the Connect Plus system, the M lead is asserted indicating audio is available at the 4-wire type II E&M interface. If the talk group is idle and the E lead is asserted by the external device connected to the DVU-2 4-wire type II E&M interface, the audio sent to the DVU-2 on the 4-wire type II E&M interface is AMBE+2™ encoded and sent to the Connect Plus system and is heard by the talk group.
For each DVU-2 two talk groups can be accessed by external analog devices. The most common is a legacy 4-wire console or analog repeater.