Clear-com HLI-4W2 Four Wire Interface Module

Clear-com HLI-4W2

Clear-com HLI-4W2 4-Wire Interface Module for HMS-4X Main Station

Product Code: HLI-4W2
Clear-Com SHLI-4W2

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

Clear-com HLI-4W2 Interface Module for HMS-4X Main Station

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


HLI-4W2’s 4-wire analog transformer and electrically isolated interfaces are assignable to any channel in the HelixNet system and provide discreet analog linelevel input and output. The 4-wire ports allow connectivity to any 4-wire intercom system, cameras, telephone circuits, stage announce, recorders or any other generic audio devices. Level control and VOX/Gate capability is provided for each interface to accommodate the connected device.

HLI-4W2 include call signaling circuits when used with compatible Clear-Com devices such as Eclipse® HX matrices and FreeSpeak II® Base II base stations

Local and Central Management Options

HHLI-4W2 can be added to any HMS-4X main station with an available option slot. Once installed, any channel can be independently assigned to either 4-wire port locally on the HMS-4X** front panel or centrally from the Core Configuration Manager™ (CCM*).

*CCM requires HLI-ET2
**HMS-4X is a legacy product as of 2022


• 4-wire interface for HMS-4X(2)
• Transformer isolated
• Level and VOX control
• Clear-Com call signal

The HelixNet System

• Wired Partyline - Networked
• Flexible cabling
• Up to 24 Channels – Licensed
• Program Audio user level control

Effortless Management

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

• Connectors

4-wire: (2) EtherCON RJ45

• 4-wire Option Module Inputs

Maximum Level Before Clipping: 18dBu

Nominal Input Level: 0dBu (selectable)

Input Impedance: >= 10KO

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: <= 100O

Route to 4-wire input at 0dBu in: Frequency Response: 300Hz - 12kHz ±3dB

Distortion: <0.1% THD @ 1kHz

Noise: <-55dBu

• Dimensions

2.2 x 7.4 x 1.5in (HxWxD)

(57 x 187 x 39mm)

• Weight

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

HTTP–Management 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

Bandwidth: 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

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