Clear-com HLI-2W2 Two Wire Interface Module

Clear-com HLI-2W2

Clear-com HLI-2W2 2-Wire Interface Module for HMS-4X Main Station

Product Code: HLI-2W2
Clear-Com HLI-2W2

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

Clear-com HLI-2W2 Interface Module for HMS-4X Main Station

Clear-com The HelixNet HLI-2W2 is a dual 2-wire interface module for the HMS-4X** main station. 


HLI-2W2’s 2-wire analog partyline interface are assignable to any channel in the HelixNet system and provide connectivity to powered Clear-Com or RTS-TW analog partyline systems. Level control and VOX/Gate capability is provided for each interface to accommodate the connected system.

HLI-2W2 include call signaling and remote mic kill circuits when used with compatible Clear-Com and RTS-TW partyline devices.

Local and Central Management Options

HLI-2W2 can be added to any HMS-4X** main station with an available option slot. Once installed, any channel can be independently assigned to either 2-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


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

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

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

• Partyline

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: >= 10KO 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

• 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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