The RB-DDA22 is a digital audio distribution amplifier with multiple inputs and outputs designed to accept one of 5 different digital inputs and output to 22 digital audio outputs of 5 different connector types. It is used for distributing digital audio data in many formats, repeating both the audio data and the status information of the input whilst re-synchronising the data and re-normalising to appropriate digital audio levels. Input Signals: 1 x AES/EBU XLR 3 female digital audio input 1 x AES-3id BNC digital audio input 1 x AES/EBU RJ45 digital audio input 1 x S/PDIF RCA Phono input 1 x TOSLink optical digital audio input Output Signals: 6 x AES/EBU XLR-3 male digital audio outputs 6 x AES-3id BNC digital audio outputs 6 x AES/EBU RJ45 digital audio outputs 2 x S/PDIF RCA Phono outputs 2 x TOSLink optical outputs The RJ-45 connectors are wired to be StudioHub+ compatible, a format as defined by Radio Systems Inc. Applications include the distribution of audio from a digital mixing console to multiple digital recorders, or feeding multiple studios with the output from a USB audio player. It can accept input sample frequencies in the range of 30kHz to 200kHz, and bit depths of 16, 20 and 24 bit. So, it can be used for standard CD signal distribution at 16 bit 44.1kHz, as well as for high quality 24 bit 96kHz or 192kHz recording. The front panel has an INPUT SELECT button and 7 indicator LEDs. The button is used to select which input to use and indicates the operating mode of the unit. The LEDs will indicate, depending on the operating mode, the selected input, the presence of a valid signal or the operating frequency. Operating Mode In "Operating Mode", the centre LED of the button is off. The unit selects this mode when a valid input signal is present and no button presses have been made for 8 seconds. The LEDs around the button illuminate amber to directly indicate the following frequencies: 32, 44.1, 48, 88.2, 96, 176.4, 192 kHz. If the input is at a non-standard frequency, the unit will indicate the two frequencies either side of the incoming frequency – e.g. if the input signal has a frequency of 64kHz, both the 48kHz and 88.2kHz LEDs will be illuminated. If the frequency is below 32kHz or above 192kHz, the appropriate LED will flash. Input Selection Mode Pressing the central INPUT SELECT button illuminates it red and allows you to select the desired input. Pressing the button will step the input selection to the next one, including auto mode. In input selection mode, the LEDs have the following states: - Off – Signal not selected and no valid signal present - Green – Signal not selected and valid signal present - Red – Signal selected and no valid signal present - Amber – Signal selected and valid signal present or auto mode selected Note: Input selection mode is automatically chosen when the selected input is not present. Auto Selection Mode In this special input selection mode, the unit will scan through all of the inputs until it finds a valid signal. If multiple signals are present, you can force selection of the next input by holding the input select button for 2 seconds, after which the next valid input will be selected.