4-Wire Interface Module



  • 4-wire interface for HMS-4X
  • Transformer isolated
  • Level and VOX control
  • Clear-Com call signal

The HelixNet System 

  • Networked Intercom System
  • Flexible cabling
  • 12 partyline channels; expandable to 24 channels via optional license
  • Program Audio distribution with independent level control

Effortless Management 

  • Fast front panel control and configuration
  • Easy to use CCM browser configuration
  • Plug-and-go with auto discovery
  • Central upgrades from main station

The HelixNet HLI-4W2 is a dual 4-wire interface module for the HMS-4X main station.

The HelixNet IP networking guide provides specifications, best practices and guidance for the integration of HelixNet into an existing or new IP network.

Item Part Number:
  • HLI-4W2

Technical Specifications


4-wire: (2) EtherCON RJ45

4-wire Option Module Inputs

Maximum Level Before Clipping: 18dBu

Nominal Input Level: 0dBu (selectable)

Input Impedance: >= 10KΩ

Route to 4-wire output at 0dBu in:

Frequency Response: 20Hz – 10kHz ±3dB

Distortion: <0.2% THD @ 1kHz

Noise: <-65dBu

4-wire Option Module Outputs

Maximum Level Before Clipping: 18dBu

Nominal Output Level: 0dBu (selectable)

Output Impedance: <= 100Ω

Route to 4-wire input at 0dBu in:

Frequency Response: 300Hz – 12kHz ±3dB

Distortion: <0.1% THD @ 1kHz

Noise: <-55dBu


2.2 x 7.4 x 1.5in (HxWxD)

(57 x 187 x 39mm)


13oz (0.38kg)

Network Specifications (Version 4)
Network Protocols

Ethernet IPv4 – Unicast Audio and Control

mDNS – Multicast Device Discovery

Layer 3 routable with mDNS function limitations

WavPack – Audio Codec

Network Ports


Port 80 TCP – System Management

Port 6001 TCP – System Management

Port 6001 UDP – Audio Streams


Port 5353 UDP – mDNS, Names, Discovery

Network Parameters

Endpoint Resource Use: 1 per active port


300 (max) kbps from each active port to HMS

1200 (max) kbps from HMS to each active port

Network Jitter Tolerance:

<= 128ms jitter buffer per audio stream receiver automatically adjusted to network performance

QoS Tags:

DSCP=46, High Priority / Expedited Forwarding (EF)

System Reserved IP Range: for endpoints

Associated Products

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