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STANAG 4851
STANAG 4851 combined power and data accessory connector for dismounted soldier systems
Makers of dismounted soldier system accessories such as radios, sensors, GPS units and night-vision goggles, the connector and cable suppliers who build to the interface, and the defence buyers who specify it.
STANAG 4851 defines the connector and pin layout that let accessory devices such as radios and GPS units share power and data with a soldier's equipment. NATO has not released it publicly; this page describes it from the Czech implementation, ČOS 593502.
- Edition
- 1
- Published
- 2022-06-21
NATO has not released this STANAG publicly. It is NATO UNCLASSIFIED, and organisations that need it obtain it through their national standardization authority.
What it is
STANAG 4851 is the NATO Standardization Agreement on a combined power and data accessory connector for dismounted soldier systems (DSS). Edition 1, promulgated in June 2022 under CNAD, AC/225 NAAG, LCGDSS, covers the publication AEP-4851. Its purpose, as the Czech defence standards index describes it, is to set requirements for a data and power interface that lets small electronic devices interoperate with a dismounted soldier system, and to define the connector's physical and electrical characteristics together with the data format.
NATO has not released STANAG 4851 publicly. This page describes it from a public national implementation, the Czech defence standard ČOS 593502 (1st edition, effective from 29 January 2025), which states that it introduces STANAG 4851 edition 1, adopting the same-titled publication AEP-4851(A). A national implementation can add national requirements and reservations, so treat what follows as the Czech implementation's content, not as NATO's own text.
What the Czech implementation covers
ČOS 593502 sets a standard interface between a dismounted soldier system and accessory devices such as radios, sensors, GPS receivers, night-vision goggles and laser range finders, carrying both data and power through a single connector. The interface uses the same physical connector as ČOS 593501, which implements the related STANAG 4695 soldier power connector, and differs from it only in the pin assignment. Sharing data between devices is the interface's primary purpose, but it can also be used to power a device only, at 5 V or at 10 to 20 V. Every cable built to the standard must be marked with the code STANAG 4851. NATO's own planning publication AEP-4845 lists STANAG 4851 among the wired connections recommended for a dismounted soldier system, alongside STANAG 4695.
The pin layout and power requirements
The mandatory pin reservations ČOS 593502 sets for the 6-pin connector are: pin 1 for power, 10 to 20 V DC at up to 5 A; pin 2 as an extended ground pin; pin 3 for power, 5 V DC at 250 mA to 2 A; pin 4 for USB positive data; pin 5 for USB negative data; and pin 6 either unconnected or reserved for a national implementation such as USB-ID or USB-CC, which enable USB host mode. The dismounted soldier system's side of the interface must supply 10 to 20 V DC at a minimum of 1 A and 5 V DC over USB; the accessory's side must handle 10 to 20 V DC without drawing more than 5 A or leave pin 1 unused, and must handle 5 V DC over USB or leave pin 3 unused. The system's output port must meet the USB 2.0 specification, and an accessory's port must meet USB 2.0 or USB 1.X. Because pin 3 also serves as a battery-charging pin under ČOS 593501, ČOS 593502 recommends a protective circuit against accidental voltages above 5 V on that pin. Electromagnetic compatibility must not stop the system and its accessories meeting ground mobile application requirements under MIL-STD-461 or the equivalent Czech test, and the connector must stay interoperable across the operating conditions the standard names, from cold to hot dry climates, as set out in STANAG 4370, MIL-STD-810 and ČOS 051627.
How we help
A supplier bound by STANAG 4851 through a contract holds the obtained text through its national authority. In ComplyTrain you record the requirements that apply to you as your own requirements, give each an owner, and keep the evidence that shows you meet them against each one.
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