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The APT MULTI-CHANNEL CODEC is a compact and efficient solution for the transport of multiple channels of audio or MPX content over IP links. It can support up to 16 channels of audio within a single unit of rackspace – and even more IP streams when using multicast or multiple unicast technology.

The 1RU frame can accommodate up to 4 AoIP modules, each equivalent to a stand-alone stereo duplex codec combining audio, dual IP transport and auxiliary data on board. It offers the entire range of audio formats and modes meeting the audio industry’s requirements: simplex, duplex, AES/EBU, AES/EBU with analog backup, analog with HI/LO or 600Ω impedance.

  • Transports up to two stereo audio channels per module
  • Deliver up to 24 IP audio streams per module
  • 192kHz Sampling supports Digital MPX over AES and fully digital transfer*
  • Simplex and duplex operational modes
  • Analog MPX I/O interface allows transport of two analog MPX signals or one MPX signal in duplex mode
  • Point-to-Point and Point-to-Multipoint operation
  • Four Independent Clock Domains per module
  • Supports Dynamic DNS for global accessibility by hostname rather than IP address
  • Supports UPnP IGD protocol for configuration of UPnP enabled gateways (routers)
  • Forwarding of audio or non-audio (such as PAD or HD Exporter data) UDP Streams
  • Supports “Diffserv” Quality of Service (QoS) on variable DSCP values
  • Support of VLANs and virtual IP interfaces enables multi-network integration for streaming and management
  • Performance monitoring on each individual IP stream
  • User selectable packet size for each stereo audio channel
  • Configurable delay-jitter buffer for each receive IP stream (1 ms to 5000 ms)
  • Headphone socket for audio monitoring
  • Supports APT’s award winning SureStream for high quality audio over open Internet links


WorldCast Systems

WorldCast Systems designs and develops a wide range of innovative broadcast equipment for the Radio & TV markets worldwide. We combine the expertise and knowledge gained over 60 years’ experience in the field with the latest innovative technologies to provide broadcast engineers with highly reliable, efficient and user-friendly products. Encompassing the leading brands APT, Ecreso & Audemat, our product range includes audio codecs, FM transmitters, RF signal monitoring, RDS encoders, audio processors and remote site control units, designed to meet the needs of both large international broadcast networks and small private stations alike. We don’t simply design and develop the products but we also work closely with our customers on turnkey projects, providing everything from advice and consultancy through rack integration to installation, commissioning and training. We count several major public and commercial broadcasters, telecom operators and regulation authorities amongst our customers but we also supply many hundreds of smaller, local and community broadcasters who are just as important to us as a company.


Ethernet: Dual physical Ethernet ports, RJ45 for management and streaming
Virtual Network: Virtual Interfaces and VLAN tagging
Analog I/O: Electronically balanced, capacitive isolated on 37 pin D-Type connector1) Imp. Hi/Lo and 600 Ω
Digital Audio I/O: AES-3, 24 Bit, transformer balanced, on 37 pin D-Type connector#2 Imp. 110 Ω
Digital Ref Input: AES, transformer balanced, on 37 pin D-Type connector#2, Imp. 110 Ω
Serial Aux Data and GPIO: 15 pin HD-Type, 2x serial on RS232 level, 4x opto-coupled inputs and relay contacts
Management: Web GUI, APT NMS, SNMP, XML API (available with a later release)


Asymmetric Audio: Independent audio modes for sent and receive, independent clock domains
Audio Modes: Simplex: 2x stereo Input or 2x stereo output; Duplex: 1x stereo Input and Output
Digital Operation: Output FS, 32/44.1/48/96/192* kHz – software configurable
Audio Bandwidth: 10Hz to 20kHz mono & stereo 85kHz for digital MPX over AES*
Standard Coding Algorithms: aptX Enhanced 16 & 24 Bit, Linear PCM 16 & 24 Bit, MPEG 1/2 Layer II, MPEG4: AAC-LC/LD/ELD, MPEG2/4: HE-AAC v1/v2
Coding Delay: min. 2ms on aptX Enhanced and higher depending on chosen algorithm
Dynamic Range: 16 Bit >85dB, 24 Bit >110dB

Network and IP

IP Protocols Supported: RTP/UDP/IP, RTCP, DNS, Dynamic DNS, DHCP, ICMP, IGMP, VLAN#, UPnP (IGD), NTP, SNMP, SMTP, HTTPS (management)
IP Statistics: Complete IP Statistics for each stream
Casting Modes: Unicast, multiple unicast, multicast, multi- multicast
De-Jitter Buffer: Buffer size 1 – 5,000ms adjustable, automatic packets re-sequencer
RTP/UPD Streaming and Modes: Multiple Tx-Streams, 2x Rx Streams, UDP stream forwarding, Auto-Detection of received Stream, Auto-Reply to sender
Quality of Service: DiffServ, with separate DSCP values per stream, SureStream Technology and Error Concealment
Backup Features: SD Card for audio file storage
Network Security: Service Filter and Firewall Features


Serial Data Rates (embedded): 11200, 2400, 4800, 9600 Baud (2 channels per AoIP module)
Serial Data Rates via IP: 1200 – 115,200 Baud (2 channels per AoIP module)
AUX Data via UDP: UDP forwarding PAD or private Data
GPIO: 4 switch inputs, 4 relays; GPI transmitted as separate UDP stream or embedded in aptX Enhanced

Physical specification

19” 1U Dimensions (H / W / L): 44mm x 482mm x 370mm 1.75” x 19” x 14.5”
Weight: 5Kg / 11lbs
Dual Power Supply: 90-250 VAC / 47-60 Hz or 36-72VDC, AC/AC, AC/DC, DC/DC (order options)
Power Consumption: < 60W
Guaranteed Working Temperatures: 0°C – +45°C
Humidity: Up to 95% relative humidity (non-condensing)

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