2-Wire Interface Module


  • 2-wire interface for HMS-4X
  • Auto nulling
  • Level and VOX control
  • Clear-Com / RTS-TW Compatible
  • Call and RMK signaling

The HelixNet System 

  • Networked Intercom System
  • Flexible cabling
  • Up to 24 Channels – Licensed
  • Program Audio distribution with independent level controls

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
Item Part Number:


The HelixNet HLI-2W2 is a dual 2-wire partyline 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.

Technical Specifications


2-wire Partyline: (2) 3-pin XLR-F


Compatibility: Clear-Com, RTS-TW configurable with Call and Remote Mic Kill
Termination: External system
Nulling: R-L-C hybrid; user initiated Auto-Calibration with Echo Cancellation
Power: 25mA from external system
Voltage: 20-30V DC (max)
Maximum Level Before Clipping: 6dBu
Nominal Input Level: -18dBu (CC), -12dBu (RTS-TW)
Input Impedance: >= 10KΩ bridging
Route to 4-wire input at 0dBu in:
Frequency Response: 100Hz – 10kHz ±3dB
Distortion: <0.2% THD @ 1kHz
Noise: <-55dBu
Route from a 4-wire output at 0dBu out:
Frequency Response: 40Hz – 10kHz ±3dB
Distortion: <0.2% THD @ 1kHz
Noise: <-75dBu


2.2 x 7.4 x 1.5in (HxWxD)
(57 x 187 x 39mm)


13oz (0.38kg)

Network Specifications (Firmware Version 4.2+)
Network Protocols

Ethernet IPv4–Unicast Audio and Control
mDNS–Multicast Device Discovery
Layer 3–Routable with mDNS function limitations
RTP–Audio Transport
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

HMS-4X 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=41, Assured Forwarding (AF)
System reserved IP range: for endpoints

Associated Products

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