Tieline MPX STL Codecs designed for the distribution of FM-MPX composite signals over IP networks.

They support uncompressed and compressed formats (including μMPX), offering reliable, high-quality audio transmission for broadcasting.

These codecs are ideal for STL (Studio-to-Transmitter Link) applications, with advanced redundancy features that guarantee stable signal distribution across multiple transmission sites.

MPX2 Stack Front 1024X492

Tieline's MPX IP codecs (MPX I & II) are advanced audio transmission solutions designed for radio broadcasters looking for exceptional quality and simplified integration. These codecs are specially designed to transmit the MPX (Multiplexed) signal, which includes audio, RDS (Radio Data System) and sound processing information directly from the studio to the transmitter, maintaining fidelity and eliminating the need for additional encoding or processing at the transmitter site.

Main features

• Full MPX signal transport

Allows integrated transmission of audio, RDS (Radio Data System) and sound processing directly from the studio to the transmitter, eliminating the need for additional processing at the transmitter site.

• High-efficiency compression

Supports lossless or low-latency compression, guaranteeing signal integrity and minimising bandwidth occupation in IP networks.

• Support for redundant streams

Provide greater resilience and stability by offering redundancy options to minimise failures in challenging network environments.

• Compatibility with various networks

They operate on different types of IP infrastructure, such as public, private or hybrid networks, adapting to the broadcaster's needs.

MPX1 Lefthigher Res
MPX

Main benefits

• Superior transmission quality

Guarantees crystal-clear audio and a consistent signal, even on challenging networks.

• Operational simplicity

Reduces infrastructure complexity by concentrating signal management in the studio and eliminating the need for multiple pieces of equipment in the transmitter.

• Cost efficiency

Efficient compression and the elimination of additional equipment result in operational and infrastructure savings.

• Scalability and flexibility

Suitable for both small broadcasters and complex networks with multiple transmitters.

Tieline Delivers Flexible FM-MPX or µMPX Transport Solutions

The MPX I is ideal for transmitting a composite STL signal from a single station with return monitoring, whereas the Tieline MPX II can transport two discrete composite FM-MPX signals from the studio to transmitters with return monitoring.

Applications

 

Sending transmission-ready FM composite signals from the studio allows broadcasters to maintain audio processing and RDS data insertion at the studio. This significantly reduces capital and operational costs by eliminating processing equipment from transmitter sites, which reduces on-site power consumption, wiring and space requirements, as well as site visits for service and support. Composite MPX over IP signals can be easily replicated and distributed using multicast and multi-unicast^ technologies and take advantage of rock solid redundancy features like redundant streaming, RIST, FEC, and automated SD card file failover.

 

Compressed μMPX and uncompressed FM-MPX encoding and decoding with FM return monitoring

 

  • Single or Dual MPX Composite Encode or Decode: Encode/Decode up to two point-to-point MPX/μMPX composite signals.

 

  • MPX/μMPX Composite Encode or Decode with Encoder or Decoder FM Monitoring: Encode/Decode two point-to-point MPX/μMPX composite signals; at the encoder monitor the demodulated local MPX input or the return feed. At the decoder monitor the MPX output or the secondary MPX feed, which is either the local MPX input or the secondary stream.

 

 

MPX Transport

 

 

MPX signals can be distributed to transmitter sites using the following transport options:

 

  • Wireless Point-to-Point STL links.

 

  • Managed networks and unmanaged Public WANs.

 

  • Satellite links using MPEG-TS.

 

 

 

 

 

 

Affordable MPX Distribution Solutions

 

Multipoint distribution via multicast or multi-unicast technologies reduces costs by affordably replicating MPX composite streams using a single MPX I or MPX II encoder, similar to how baseband IP audio streams are replicated in audio codecs. Compressed µMPX composite signals can be distributed over WANs like the internet at low bit-rates to reduce bandwidth requirements.

 

 

 

 

MPEG-TS over Satellite

 

An optional satellite tuner card with MPEG-TS and MPE support lets you encode MPEG-TS over IP to transmit UDP streams over DVB satellite connections. When the satellite signal is received at the decoding MPX unit, a satellite tuner card decodes the DVB-S or DVB-S2 signal and the MPX unit outputs MPX composite directly into the exciter.

 

 

 

 

Specifications

 

Audio

 

  • Robust DSP-based architecture designed for rock solid, mission critical MPX audio
  • 16-bit (2.3 Mbps) and 24-bit (4.6Mbps) Raw MPX
  • Optional μMPX encoding: 320, 340, 360, 384, 400, 448, 512, 576, 640, 704, 768, 800, 900 kbps
  • Support for μMPX v1, 2, 3 and 4
  • Sampling frequency: 192kHz
  • Support for RIST
  • Support for Multi-unicasting μMPX streams
  • Multicast MPX to unlimited endpoints over compatible networks.
  • Monitor demodulated MPX locally, or stream external signal at decoder back to encoder for monitoring
  • MPX/μMPX redundant stream with hitless packet switching at the decoder
  • Support for non-MPX IP connections
  • Full size SD card slot for firmware upgrades and backup files

 

Security

 

  • User name and password protection of codec and Toolbox Web-GUI.
  • Support for SSL Security Certificate installation

Connectivity

 

  • 1 (MPX I) or 2 Shared Stereo Analog Line Inputs; 1 (MPX I) or 2 x stereo AES3 Inputs via RJ-45.
  • 1 (MPX I) or 2 Shared Stereo Analog Line Outputs; 1 (MPX I) or 2 x stereo AES3 Outputs via RJ-45.
  • 1 (MPX I) or 2 Stereo AES192 Digital MPX Composite Inputs & Outputs via RJ-45.
  • 1 (MPX I) or 2 BNC Analog MPX composite Inputs and 2 (MPX I) or 4 BNC Outputs.
  • 2 (MPX I) or 4 x Serial I/O Ports.
  • SmartStream PLUS dual redundant IP streaming.
  • DVB-S and DVB-S2 supported via optional DVB module; 16, 24 and 32-bit PCM at 96kHz.
  • 5 automated, or fixed/static jitter buffer settings.
  • Two Gbit Ethernet ports for Control/IP streaming over WANs.
  • Gbit Ethernet port for Control.
  • Gbit Ethernet AoIP/LAN4 Port.
  • Opus encoding for confidence Monitor connections
  • Non-MPX IP Encoding Options: Tieline Music/MusicPLUS, Opus, G.711, G.722, MPEG Layer 2, MPEG Layer-3, AAC algorithms, 16/24 bit aptX® Enhanced
  • 2 configurable Input/Output BNC sync connectors
  • DB-25 Control Port I/O Supporting: 4 GPIOs in MPX I; 8 GPIOs in MPX II.
  • Highly advanced error concealment strategies.
  • Real-time IP connection packet statistics.

 

 

Operation

 

  • Full hardware front panel interface including navigation, LCD display, PPM meters and dialing key pad.
  • User-friendly HTML5 Toolbox Web-GUI enables codec configuration and control remotely over WANs.
  • Auto switching, dual redundant internal AC power supplies.
  • IPv4 & IPv6 compatible and ready.
  • Integrated alarm management including automatic silence detection.
  • Configurable software rules engine via web-GUI.
  • Upgrade firmware from SD card.
  • Backup and restore configuration via SD card.
  • Automated firmware upgrade notifications via Web-GUI.
  • Support for multiple languages.
  • Compliant with RAVENNA Stream Discovery and Advertisement.
  • Livewire+ Compliant
  • NMOS IS-04 & IS-05 Discovery, Registration and Connection Management.
  • Compliant with Audio Engineering Society standards for AES67.
  • Compliant with ST 2110-30, ST 2022-7 and Ember+

Features

  • Sdcard
    SD card backup
    SD card backup delivers file failover.
  • Ehthernet
    Dual Ethernet Ports
    Dual Gigabit (10/100/1000) RJ-45 LAN ports for IP Streaming / Control
  • Power
    Dual Internal Power Supplies
    Dual Power Supplies to protect you in case one fails
  • Unicast
    Multicast & Multi-Unicast
    Multi-unicast μMPX signals to reduce CAPEX and OPEX at the studio and TX sites. Multicast uncompressed MPX or compressed μMPX signals
  • Streaming
    Redundant streaming
    Redundant streaming with hitless packet switching, RIST and Forward Error Correction (FEC)
  • Support
    Support for GPIOs
    Support for GPIOs in MPX or μMPX modes.
  • Remotecontrol
    Full remote control
    Full remote control using the HTML5 Toolbox Web-GUI, Cloud Codec Controller, plus comprehensive automated alarms and SNMP monitoring.
  • Analogdigital
    Analog and Digital
    Support for both analog and digital MPX signals allows networks to support transmissions using analog transmitters as networks transition to newer all-digital setups over time.
  • Monmitordemodulated
    Monitor demodulated MPX
    Monitor demodulated MPX at the encoder or decoder.
  • Compressed
    Transport Compressed μMPX
    Transport uncompressed MPX or reduce bandwidth requirements by transmitting compressed μMPX Composite signals to sites.
  • MPEG TS
    MPEG-TS over Satellite
    An optional satellite tuner card with MPEG-TS and MPE support can receive DVB-S or DVB-S2 signals
  • Returnfm
    Return FM Monitoring
    Monitor demodulated MPX locally, or stream an external signal at the decoder back to the encoder for monitoring.