DVU-2 Brochure
	The DVU-2 Digital Vocoding Unit is a dual port interface that converts analog telco to Connect Plus Talk Group format. 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 Digital Vocoding Unit Contact your Trident sales representative for details. 828-684-7474 800-798-7881
	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 AMBE2+ encoded and configured as an IP Site Connect 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 talkgroup 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 AMBE2+ encoded and sent to the Connect Plus system and is heard by the talk group. For each DVU-2 two talkgroups can be accessed by external analog devices.  The most common is a legacy 4-wire console or analog repeater.