Subnero M25M Series Platinum Edition medium-frequency (MF) acoustic smart modem in a rugged housing on a protective cage base, with underwater connector and antenna Two Subnero M25M Series Platinum Edition MF acoustic smart modems in bronze and dark green rugged housings, showing available hull finish options
Subnero M25M Series Platinum Edition MF modem thumbnail – front view on cage base Subnero M25M Series Platinum Edition MF modem thumbnail – bronze and dark green hull finishes
Legacy
Platinum Edition
MF Band

M25M Series

20 - 32 kHz Band

Delivering performance under the toughest environmental conditions, Subnero’s platinum edition modems are designed to meet rigorous quality standards mandated by sectors such as defense, oil & gas and subsea engineering.

Key Features

  • Up to 15 kbps* data rate.
  • More than 4 km communication range in tropical waters.
  • Certified to MIL-STD-810G, 461E, and related environmental standards.
  • Ranging functionality with 0.1 m precision.
  • Doppler resilience of ±4 knots or better.
  • Support for coherent and incoherent communication schemes.
  • Support for arbitrary signal transmission and recording (passband, baseband).

* Depending on channel conditions and reliability requirements.

Subnero M25M Series Platinum Edition medium-frequency (MF) acoustic smart modem shown at an angle with its protective transducer cage and underwater connectors

Flexible Configurations

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

WNC-M25MPS3

Subnero WNC-M25MPS3 Standalone Configuration Preview

Standalone Configuration

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

WNC-M25MPE3

Subnero WNC-M25MPE3 Embedded Configuration Preview

Embedded
Configuration

Integration-ready electronics 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.

Embedded Configuration (OC)

The embedded configuration (EC) 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-based missions, and payload integration within custom subsea assemblies, providing flexibility without compromising performance.

Brochures

Subnero M25M Underwater Modems brochure Subnero M25M Underwater Modems

Technical Specification

Communication
Feature Details
Modulation (software defined) PSK-OFDM, FH-BFSK
FEC (Forward Error Correction) LDPC, BCH, Convolution code
JANUS support Yes, subject to operating frequency band
Bandwidth 12 kHz (20 - 32 kHz)
Software
Feature Details
Framework UnetStack
User Interface Interactive web UI
Software Interfaces Java, Groovy, Python, C, JavaScript, Julia
Electrical
Feature Details
Power supply 22 - 28 VDC (24 VDC recommended)
Power consumption < 4 W (receive mode, nominal)
< 60 W (transmit mode, avg.)
< 80 W (transmit mode, max.)
< 1.5 W (sleep mode)
External interface Ethernet (10/100 Mbps), RS232 (115200 bps)
Mechanical
Feature Details
Hull material Aluminum
Operating depth 300 m
Dimensions SC: ⌀ 127 ✕ 400 mm EC: 90 ✕ 90 ✕ 180 mm
Operating temperature SC: 0 to 50 °C EC: 0 to 70 °C (Electronics), 0 to 50 °C (Transducer)
Supported MIL standards MIL-STD-810G, MIL-STD-810E, MIL-STD-461E
Workmanship - IPC class 2A
- Conformal coating
- Environmental Stress Screening (ESS)

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.

View Details →
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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