Inside view of the 220 MHz version of the DB-1000 Software Defined Base Station Repeater. In the upper left are the shielded transmitter and receiver modules. These units plug into the motherboard. At the upper right is the bottom side of the Pentium-class processor. The channel processor module (CPU and DSP) is directly below it. The UPS batteries are near the bottom (front). and the plug-in 200 watt switching power supply is to the lower right. Ample fans provide cooling. A front panel loudspeaker provides the ability to monitor analog demodulation to observe co-channel signals. An optional digital telephone interconnect module is available and nests atop the channel processor module.