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Fiber Linking Interface

  • HMS-4X(2) fiber linking

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

Item Code


Optional Accessories:

HLI-SMFO: Single-mode transceiver

HLI-MMFO: Multi-mode transceiver


Transceiver Connectors

(2) 100Mb SFP Ethernet Connections

For use with:

HLI-SMFO Single-Mode transceiver (1 included)

HLI-MMFO Multi-Mode transceiver


2.2 x 7.4 x 1.5in (HxWxD)

(57 x 187 x 39mm)


13oz (0.35kg)

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 655 TCP–Link Group Audio/Database Communication

Port 6001 TCP–System Management

Port 6001 UDP–Audio Streams


Port 5353 UDP–mDNS, Names, Discovery, Linking, Expansion Optional for device names and linking

Network Parameters

HMS-4X Endpoint Resource Use: None

Bandwidth: 300 kbps each audio input linking between HMS/LQ Link Group audio sent dynamically between members 300-600 (max) kbps from an active audio input to HMS 1200-2400 (max) kbps from HMS to endpoint

Network Jitter Tolerance: <= 128ms jitter buffer per audio stream receiver automatically adjusted to network performance

QoS Tags: DSCP=41, Assured Forwarding (AF)

Link-Local Default IP Address Range:

System Reserved IP Ranges: for endpoints for Link Group

Recommended Ethernet Switches

• Managed Ethernet Switch – Layer 3

• 100/1000 Base-T ports for endpoints

• 1000 Base IP Trunks between switches

• QoS configuration

• Energy Efficient Ethernet bypass option

• IGMP Snooping bypass option

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