The Systembase C500xr range of digital audio codec's have been designed and manufactured to deliver unparalleled performance for professional, real-time audio applications. All models incorporate the fast apt-X Sub Band ADPCM compression system with a coding delay of only 2.8ms at data rates of 384Kbps. In addition the C510xr and C520xr ISDN models support G.711 and G.722 coding algorithms to provide compatibility with other manufacturers codecs. Additional design features include 24bit analogue and AES audio interfaces. The analogue interface is electronically balanced resulting in a high Common Mode Rejection Ratio (CMRR).

The C500xr Codecs are well suited for implementing FM and DAB Studio-to-Transmitter Links (STL's), providing up to 22.5KHz Stereo audio over a 384Kbps digital line. To maintain program continuity, an automatic ISDN backup is initiated if there is a failure on the primary circuit. The restoration of the audio back to the digital line also occurs automatically once the fault condition has cleared. To reduce the number of ISDN lines required, the codecs can be configured to monoise the input audio during ISDN backup, and to deliver the audio to both left and right outputs. The bi-directional auxiliary data port facility can be used to simultaneously send RDS control signals to the transmitter, and receive telemetry information.

Systembase codecs interface directly between the audio equipment and the ISDN network via standard ISDN RJ45 sockets. To facilitate world-wide operation, 12 international ISDN standards are supported, and can be selected by the user from either the front panel or the Web Server interface.

The C500xr codecs can provide two 4 wire productions comms audio channels for Outside Broadcasts (OB). The bandwidth of the audio channels is selectable to be either 3.7kHz or 7.5kHz and enables clear communications between the OB team and the producer located at the main studio.

The Digital Hybrid Facility offers a direct replacement for a Telephone Balancing Unit (TBU). The G711 encoding & decoding facility replaces the requirement to install additional TBU's and analogue telephone line. The C500xr can either dial up or receive calls via the ISDN line(s) and connect to a TBU or an analogue telephone, and can even connect to a mobile telephone.

AES3 digital audio interface is provided on all models, and is equipped with automatic sample rate conversion to simplify the problems of connecting between a studio reference clock and the ISDN network clock. The AES3 interface is supported via two transformer isolated XLR connectors located on the rear panel.

The C500xr range of audio codecs features a built in Ethernet connection. This facility allows each codec to be allocated a unique IP address and remotely managed using the standard windows web browser.