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ADX-120 ANNOUNCE UNIT The ADX-120 Anounce Unit is a new approach to the standard sports broadcast announce booth requirements.  This unit employs audio transport via standard Ethernet to provide many advantages in the remote TV environment. The ADX-120 is a compact, self-contained unit providing the following features: two microphone Inputs: a front panel headset input and a rear panel XLR for a second mike or line source. a two-channel (interrupt and program) IFB for the headset a second two-channel IFB on a rear panel XLR. This output can be wet (RTS format) or dry balanced. a two-channel RTS-format wet intercom/PL connection on a rear panel XLR. two talkback paths, activated by illuminated, relegendable buttons on the top of the unit. an illuminated mute button for the headset microphone. two four-wire-to-two-wire converters for the PL circuits two RTS-format power supplies, one for the PLs and one for the IFBs, short and overload protected. two high-quality microphone preamps with remote control of preamp gain from the ADX2400 in the truck. redundant 100baseT Ethernet connections, with power supplied via the CAT5 cable. An ADX2400 Audio Distribution unit provides the 'truck end' of the system. One ADX-2400 supports up to four of the ADX-120 announce units, or a combination of ADX-120 and ADX-140 units.   The ADX2400 provides remote control of all functions and status monitoring of various parameters such as board temperature and PL and IFB voltages and currents. The ADX2400 also provides full-flexibility routing of IFB and program inputs, talkback outputs, and PL port assignments.  It also provides headphone and VU monitoring of all signals to and from the booth. The connection between the booth and the truck is Ethernet, via a variety of media.  Typically fiber would be used, with an Ethernet switch in the booth providing the fiber connection to the truck via a similar switch or media converter.  A single gigabit fiber connection can support up to 48 of the ADX-120 announce units and/or ADX-140 interface units.  The ADX-800 Dual Power Supply is located with the switch in the booth and provides fully-redundant power for up to eight of the ADX-120s. Since all audio traffic is a standard, registered Ethernet Layer 2 protocol, it can use standard off-the-shelf IT switches and other components.  Redundancy is easily accomplished at any level that is appropriate for the application using standard IT techniques.