Fischer KEYSTONE™ Data & power hub

Easy to wear. Easy to connect. Easy to control.

Easy connectivity and data and power management for soldier-worn digital efficient equipment

Fischer KEYSTONE™ is a simple, easily deployable personal area network solution to the soldier connectivity challenge. Seamlessly integrated.

Fischer Connectors’ new tactical connectivity solution serves as the keystone to soldiers’ digital equipment. It enables soldiers to connect their body-worn devices easily and reliably, and to efficiently manage power and data flows through a single source.


The soldier can easily control the hub, devices and power supply through a single app on the EUD. This app comes as standalone or as a plug-in within the Android Team Awareness Kit (ATAK).



Fischer KEYSTONE™ is a complete MIL-spec solution comprising three parts – hence the triangle in its logo:


  1. Fischer KEYSTONE™ 6, a 6-port tactical hub for data (USB 2.0 and SMBus) and power (100 W – 5 A max)
  2. A power management app that can be seamlessly integrated as an ATAK plug-in
  3. Customized cable assembly solutions with connectors intermateable with other Nett Warrior/NATO STANAG 4695 and 4851 connectors

Key features

Fischer KEYSTONE™ is the innovative wearable solution to one of the main connectivity challenges confronting dismounted soldiers – size, weight and power (SWAP).


Swiss-engineered for MIL-spec digital connectivity with Fischer Connectors’ world-renowned technologies in ruggedness, sealing,  miniaturization and data transmission.


  • Manages power (100 W – 5 A max) and data (USB 2.0 and SMBus)
  • Meets MIL-STD 810 and 461
  • Secure firmware
  • ATAK plug-in
  • USB-C bidirectional power delivery
  • Connects to all Nett Warrior/NATO STANAG 4695 and 4851 standard components
  • Simple operation with no training required
  • No maintenance or repair parts
  • Competitive multiport tactical hub
  • Manages all digital equipment for most soldiers

Electrical and data architecture

The Fischer KEYSTONE™ multiport hub and cable assembly solutions enable soldiers to power their devices through a central battery, optimizing resource management for lighter combat gear. With the SMBus technology, the hub monitors battery state of charge and operating time, while the user manages the system’s energy flow on the EUD power management app. The individual PANs’ energy consumption can be independently monitored and controlled for better efficiency.

VBATT power distribution


  • Wide range of batteries supported, incl. SMBus protocol
  • Unregulated VBATT distribution between 10–20 V DC
  • Dual battery hot-swap functionality
  • Electrical fail-safe mechanisms on all ports
5 V DC power distribution


  • USB devices powered by regulated 5 V bus
  • USB-C bidirectional power delivery on EUD port
  • Radio 5 V DC Power IN functionality on RADIO/BATT port
  • Robust protection of 5 V bus circuits
Data distribution


  • EUD / HOST USB HUB upstream port
  • PANs, BATT and RADIO / BATT USB downstream ports
  • Automatic detection between USB and SMBus on BATT and RADIO/BATT ports


Examples of supported batteries

Software application

The Fischer KEYSTONE™ system software has been designed to provide an easy-to-use all-in-one application to manage the power and data flows of all worn devices, thus enhancing the situational awareness and efficiency of soldiers at every level of their mission in the field.


The Android power management application delivered by the Fischer KEYSTONE™ software comes as a standalone app or as a plug-in seamlessly integrated within the industry standard ATAK (Android Team Awareness Kit). The app or plug-in serves as a single, centralized PAN management application with an easy-to-read GUI on the soldier EUD – smartphone or tablet.


Software security is ensured through only booting signature verified with a SHA256 checksum and an ECC256 signature, while update files are encrypted using an AES 256 encryption. The firmware code has been designed to meet the FIPS 140-2/3 requirements.


Standalone power management app


ATAK plug-in

Hub specifications

Standard connectors and cable assemblies


Designed to be compatible with Nett Warrior components and intermateable with other NATO STANAG 4695 connectors, the Fischer UltiMate™ 80 connector has been engineered to offer ultra-rugged, lightweight and IP68-sealed connectivity solutions with up to 10,000 mating cycles.


The connector comes in two layouts featuring 6 or 7 signal and power contacts with up to AWG 22.


Cable assemblies

The Fischer KEYSTONE™ solution offers various cable assemblies that can be customized upon request.


Related case studies, news & blog

Product news

Fischer KEYSTONE™ delivers easy connectivity and efficient power management for soldier-worn digital equipment


Fischer Connectors showcases new soldier connectivity as key design enabler to address the revolution in military affairs


Trend Paper: ‘The connectivity challenge – a new revolution in military affairs’

Interested in deploying Fischer KEYSTONE™ ?