APT IP/ISDN CODEC (formerly known as WorldCast Equinox) is a multi-algorithm, fully duplex, stereo audio codec offering IP, ISDN and X.21 / V.35 connections.

Designed primarily for studio to transmitter links and interstudio networking applications, the APT IP/ISDN CODEC provides a reliable platform for the transport of broadcast grade audio with 24/7/365 reliability.


Audemat ScriptEasy Powerful Performance

  • Fully duplex stereo audio codec
  • High quality audio transport over IP networks with support for Unicast & Multicast applications
  • ISDN interface with Mucas Bonding & L3 Telos Bonding, CCS, H221 & Hitachi ISDN Bonding
  • X.21/V.35 interface
  • Robust DSP-based platform for mission-critical operation


Audemat ScriptEasy Powerful Control

  • Front panel operation with level meters and headphone socket
  • Highly intuitive Network Management Software (NMS)
  • Allows management of network conditions such as packet size, buffers and QoS levels for optimum audio performance
  • Embedded Auxiliary data for transmission of RBDS /RDS or PAD


Audemat ScriptEasy Powerful Savings

  • Competitvely-priced professional audio codec
  • Flexible Platform can be deployed on many different networks
  • Support for cost-effective IP networking


  • Automatic back-up from IP to X.21/V.35 or ISDN - or from X.21/V.35 to IP or ISDN
  • Non-destructive, cascade-resilient, real-time coding with aptX® Enhanced
  • Wide range of algorithm and coding options 
  • Support for SIP/SDP
  • Support for Layer III bonding ensuring ISDN compatibility with existing units
  • DSP-based platform for 24/7/365 reliability
  • Reliable DSP-based architecture


Offering multiple connection options, the IP/ISDN codec is ideal for use by broadcasters who wish to back-up their primary IP connection with a secondary ISDN or X.21 / V.35 link. The inbuilt silence detection will identify a failure on the main link and automatically switch to the pre-defined back-up connection.

APT IP/ISDN to APT IP/ISDN duplex IP link with X21 or ISDN Backup connection
user report

Informe de usuario

«Creemos que los códecs APT ofrecen una combinación única de gran calidad de audio con un nivel muy alto de fiabilidad y esto los ha convertido en el proveedor preferido de las emisoras japonesas»
Suzuki San, Gerente de Ventas, TechnoHouse Inc, Japón


Current version: 3.3


IPEthernet 1 x RJ45, RTP/UDP, SIP/ SDP
X.21 / V.3515 Way D Type DTE, RS422 levels, Rates 64-576 kbps
ISDN2x RJ45 - standard
Aux Data9 pin D Type, RS232 level
Data Rates (embedded)1200, 2400,4800, 9600 Baud
Data Rates (via IP)1200, 2400, 4800, 9600, 19200 Baud
ControlNMS Software & SNMP, Optional front panel
Digital Audio I/OAES/EBU, Balanced XLR-3, Impedance 110 Ω
Digital Ref InputAES-3
Analog Audio I/OBalanced XLR-3, Input Impedance >10k / 600 Ω, Output Impedance <50 / 600 Ω
Alarms8 Alarms on 25 pin D Type, NO/NC relay contacts
Inputs25 way D Type, 8 Opto-coupled or Switch Inputs driving 8 Relay Outputs
Digital Operation10Hz through to 22.5kHz mono & stereo
Digital Audio Bandwith10Hz through to 22.5kHz mono & stereo
ADC / DAC Sampling Rates8kHz-48kHz
Analog Audio Bandwith10Hz through to 22.5kHz mono & stereo
Sample Rate Converter 8:1 (with bypass modes)
A/D Converter 24-bit/96kHz sigma-delta
Standard CodingLinear PCM 16 / 20 / 24Bit (Dolby E support), aptX Enhanced 16-Bit & 24-Bit, MPEG I Layer II, MPEG I Layer III, MPEG 2 Layer II, G.711, G.722, ISO/MPEG 2/4 AAC-LC, ISO/MPEG4 AAC-LD & AAC-ELD, HE-AAC v2
Compression RatioEnhanced apt-X:   4:1 / others: Variable
Coding DelayEnhanced apt-X 1.9ms @48kHz Fs
Dynamic Range16 Bit > 85dB,  24 Bit > 120dB
Phase Response Linear0 to Fs/2
Pass Band Ripple< 0.2dB
Physical specification
External Dimensions (W / L / H)44mm x 480mm x 360mm  / 1.75” x 19” x 14.2”
Weight3.5Kg / 7.7lbs
Main Power Supply100-250VAC, 50-60Hz (optional 48VDC Supply)
Power Consumption< 20W
Guaranteed Working Temperatures0°C - +55°C
Humidity10-95% non-condensing relative humidity



  • APT IP/ISDN CODEC - Manual (Legacy product)

    Publicado en 3/6/2020

Notas Técnicas

  • La guía esencial de Audio sobre IP para las Emisoras

    Publicado en 29/5/2020


  • WorldNet NMS Software

    Publicado en 5/11/2018


  • Conformity certificate - APT IP ISDN CODEC

    Publicado en 12/5/2020


  • WorldCast Systems Overview

    Publicado en 1/10/2019

Inicios rápidos

  • APT IP/ISDN CODEC - Quick start

    Publicado en 13/5/2020

Kit de prensa

  • Logo WorldCast Systems - Paquete de prensa

    Publicado en 16/9/2019