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)
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