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    WorldCast Systems APT ­MULTI-CHANNEL CODEC

    Multiple Channels of Audio & MPX over IP

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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


    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)

    APT Multichannel Codec Brochure


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