Subnero L12L Series Silver Edition low-frequency (LF) acoustic smart modem in side profile, showing its compact cylindrical underwater housing and connector Subnero L12L Series Silver Edition LF acoustic smart modem mounted upright on its base, showing the underwater connector and cable assembly Disassembled Subnero L12L Series Silver Edition modem showing its internal electronics stack, processing board, and pressure housing components Subnero L12L Series Silver Edition acoustic smart modem on a dockside ledge with a harbor in the background, ready for long-range underwater deployment
Subnero L12L Series Silver Edition LF modem thumbnail – side profile view Subnero L12L Series Silver Edition LF modem thumbnail – upright mounted view Subnero L12L Series Silver Edition LF modem thumbnail – disassembled internal components Subnero L12L Series Silver Edition LF modem thumbnail – dockside deployment view
Gen4x
Silver Edition
LF Band

L12L Series

Designed for reliable long-range communication in shallow waters, Subnero’s Silver Edition L12L series modem addresses one of the toughest challenges in underwater acoustics — maintaining robust links over extended distances in complex environments.

Built on decades of research and innovation, the L12L series enables dependable data transfer beyond 10 km, unlocking new possibilities for remote monitoring, tracking, telemetry, and control of subsea assets. Engineered for endurance and stability, it supports mission-critical operations across defense, research, and commercial deployments, where long-range connectivity is essential.

Applications

  • Long-range operations in shallow, mid-range and deep waters
  • Long-term seabed or sensor node deployments
  • Communication and tracking of AUVs and subsea vehicles
  • Coastal area monitoring networks

Key Features

  • Communication range exceeding 10 km in littoral waters*.
  • Up to 8 kbps data rate at shorter ranges.
  • Supports NATO JANUS standard.
  • Ultra-low power deep sleep mode (< 1 mW) for extended deployments.
  • Acoustic ranging functionality.
  • Doppler resilience of ±4 knots or better.
  • Supports arbitrary waveform transmission and recording.
  • Fully programmable using UnetStack for user-defined protocols.

* Depending on channel conditions and reliability requirements.

Subnero L12L Series Silver Edition low-frequency (LF) acoustic smart modem shown at an angle, highlighting its rugged underwater housing and connector

Flexible Configurations

Available in standalone, and open configurations to suit a range of deployment needs—from self-contained setups to integrated systems.

WNC-L12LSS4X

Subnero WNC-L12LSS4X Standalone Configuration Preview

Standalone Configuration

Self-contained modem powered by an external battery or supply.

WNC-L12LSO4X

Subnero WNC-L12LSO4X Open Configuration Preview

Open
Configuration

Integration-ready design for AUVs, ROVs, and sensor platforms.

Standalone Configuration (SC)

The standalone configuration (SC) features a pressure-rated housing designed for operation at various depths, powered externally via batteries or through a surface power supply. This configuration is ideal for fixed or moored sensor nodes, seabed installations, coastal monitoring stations, or surface-deployed relay systems, where ease of deployment and reliability are critical.

Open Configuration (OC)

The open configuration (OC) streamlines integration and enhances adaptability, making it ideal for incorporation into subsea platforms such as marine robots, autonomous systems, and larger sensors. It supports seamless electrical and software integration for platforms. This configuration is well suited for AUV- or USV-based missions, and payload integration within custom subsea assemblies, providing flexibility without compromising performance.

Brochures

Subnero L12L Series Underwater Modems borchure Subnero L12L Series Underwater Modems

Useful Links

WNC Product Series

Technical Specification

Communication
Feature Details
Modulation (software defined) PSK-OFDM, FH-BFSK
FEC (Forward Error Correction) LDPC, BCH, Convolution code
JANUS support Yes
Bandwidth 7 kHz (9 - 16 kHz)
Software
Feature Details
Framework UnetStack
User Interface Interactive web UI
Software Interfaces Java, Groovy, Python, C, Javascript, Julia, JSON/TCP
Electrical
Feature Details
Power source 18 - 30 VDC (24 VDC recommended)
Power consumption < 4 W (receive mode, nominal)
< 45 W (transmit mode, avg.)
< 200 mW (sleep mode)
< 5 mW (deep sleep mode)
Wake up modes Acoustic wakeup, External electrical interrupt, Scheduled wakeup
External interface Ethernet (10/100 Mbps), RS232*
On-board storage 256 GB, 1 TB
Receive channels 1, 2 (configurable at the time of purchase)
Mechanical
Feature Details
Hull material Aluminum, Stainless steel
Depth rating 300m, 2000m
Dimensions SC: ø 100 x 313 mm, OC: ø 88 x 137 mm
Operating temperature SC: 0 to 40 °C, OC: 0 to 70 °C (electronics) 0 to 40 °C (transducer)
* Different cable required for RS232 connection.

Quick LInks

LF Band

L12L Series

9 - 16 kHz band

Long-range, acoustic communication for persistent presence.

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MF Band

M25M Series

20 - 32 kHz band

Versatile connectivity for diverse set of applications.

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HF Band

S40H Series

25 - 50 kHz band

High-speed connectivity for data-intensive underwater applications.

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Gen4X

Components, Accessories & Optional Upgrades

Expand functionality with modular components, accessories and upgrades.

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Legacy

Gen4 WNC Series

Trusted technology continuing to support ongoing deployments.

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