New DSP Architecture

24bit Digital Audio
32bit Signal Processing
Selectable headroom
(+12dBm or +18dBm)

Ethernet Support

Web Server
Remote Management
SMTP Email Alerts
Backup User Settings
Restore User Settings
Firmware Updates
SNMP Management
SNMP Traps


G.711 (Telephone)
APTX (64->384Kbps)


ISDN: 128Kbps
Dual G.711
Dual G.722
Automatic Backup/Restore
External Trigger Dial
12 ISDN Standards


Transformer Isolated Dedicated XLR

User Interface

24x2 Character VFD
Full VUMetering
Back Space Key

New Telemetry Features

2 x End-End Relays
9600,4800,2400 Aux Data


The Systembase C510xr audio codec has been designed and manufactured to deliver unparalleled performance and reliability for professional real-time audio applications over ISDN and X.21. The C510xr incorporates the fast apt-X Sub Band ADPCM compression system which can deliver a coding delay of only 2.8ms, in addition to G.722 and G.711.

The C510xr is fully compatible with the existing C310xr ISDN codec when operating over ISDN and X.21 circuits. In addition, the C510xr also supports Dual G.711 and Dual G.722 coding to provide enhanced compatibility with ISDN Codec's from other manufacturers. Additional design features include 24 Bit analogue and AES audio interfaces. The analogue interface is electronically balanced resulting in a high Common Mode Rejection Ratio (CMRR) for a significant improvement in performance.

Following a power failure, the C500 series of audio codec can fully reboot to the ready state in approximately 1 second.

C510xr ISDN Codec


The C510xr Codec is 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 Codec's 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. Alternatively, the auxdata port maybe configured to implement a set of end-to-end contact closures for relay based remote management.

The C510xr backup feature is fully interchangeable with the existing C310xr.


Systembase Codec's 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 C510xr codec 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 Dual G711 encoding & decoding facility replaces the requirement to install additional TBU's and analogue telephone line. The C510xr 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.

On the latest version of the codec firmware it is possible to independently control the dialing of individual ISDN B channels from the WEB browser interface.


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 C510xr audio codec features a dedicated Ethernet connection reserved purely for WEB management and SNMP control. This dedicated Ethernet connection provides essential isolation from the IP (AoIP) streaming connection, simplifying the process connecting the codec to the public internet. The management interface allows each codec to be remotely managed using the various standard web browsers such as IE, Chrome and Firefox. To enable a hassle free experience the WEB server pages have been developed to avoid the use of active x components that may require administrative rights to install on the local computer. In addition, this feature allows the Web manager to function correctly on MAC OS.

All C500 series Codec's have a facility to apply firmware updates via the WEB interface. This feature allows for hassle free maintenance in environments where physical access is not always possible. During the update process the upgrade file, typically 400Kb, will be checked for integrity prior to being flashed into the system. Program disruption is minimized to approximately 20 seconds.

C510xr ISDN Codec Menu


All Systembase ISDN Codec's provide support for SNMP (Simple Network Management Protocol). SNMP allows the codec to be managed by industry standard, third party applications that are capable of monitoring and controlling equipment over LAN and WAN environments. All Systembase ISDN Codec's are supported by the BNCS control platform developed by ATOS and DataMiner developed by Skyline Communications. This feature makes the C510xr audio codec ideal for integration into a automated control room environment.


A Recent addition to the C510xr audio codec has been the provision for selecting the effective headroom at the Codec's analog interface. By default the analog headroom is set at +12dBu. However, the user may now change to headroom to +18dBu from either the front panel menu or web server interface.

C510xr ISDN Codec SNMP and BNCS


C510xr X21 ISDN Codec

Download C500xr ISDN CODEC Brochure
C510ip Specification

Technical Specification