SOtM sNI-1G Ethernet Card

SOtM sNI-1G Ethernet Card for High-End Network Audio

Advanced Network Connectivity. Engineered for Music.

The SOtM sNI-1G Ethernet Card is a specialist Gigabit network interface designed for high-end music servers, dedicated audio PCs and computer-based digital playback systems.

Unlike a conventional computer network adapter developed primarily for reliable data communication, the sNI-1G incorporates additional electrical-noise management techniques intended for demanding audio applications.

Its design combines a PCI Express Ethernet controller, specialised network filtering, a buffered M.2 interface and flexible internal or external power supply options.

The result is an audio-oriented Ethernet interface intended to provide reliable network connectivity while addressing unwanted electrical interference within a computer-based music system.

A Different Approach to Network Audio

Modern digital music systems depend on network connections to access streaming services, music libraries, servers and network-attached storage.

In many installations, the Ethernet connection is provided by a standard network interface integrated into the computer motherboard.

Although such interfaces are designed to transmit digital data reliably, the electrical environment inside a computer can be particularly demanding.

Processors, memory, storage controllers, switching regulators and other electronic circuits can generate unwanted high-frequency electrical noise.

SOtM developed the sNI-1G with the objective of addressing the interaction between this electrical environment and the network audio interface.

The manufacturer’s design philosophy focuses on controlling unwanted electrical disturbances rather than altering the digital audio data itself.

Specialised Ethernet Noise Filtering

The sNI-1G incorporates a dedicated network interface architecture developed for high-end audio applications.

According to SOtM, each Ethernet signal line benefits from a separate transformer and common-mode filtering arrangement.

This design is intended to provide improved immunity to unwanted electrical interference associated with the network connection.

The card also incorporates an Ethernet noise-filtering approach designed to address electrical noise extending into the audio-frequency range.

These features reflect SOtM’s emphasis on managing electrical interference across the complete digital playback chain.

It is important to distinguish electrical noise from the digital information carried by Ethernet. Under normal operating conditions, Ethernet transfers data reliably without changing the contents of music files.

Any audible differences associated with a specialist network interface depend on the electrical design of the connected equipment and the overall audio system.

Filtered and Buffered M.2 Interface

One of the defining engineering choices of the SOtM sNI-1G Ethernet Card is the use of a dedicated M.2 interface board.

Rather than installing directly into a conventional motherboard PCIe expansion slot, the card communicates through a compatible PCIe-enabled M.2 interface.

The main sNI-1G board is connected to the M.2 adapter through a dedicated interconnection cable supplied for this purpose.

SOtM specifies a filtered and buffered interface between the network card and the computer motherboard, designed to help limit unwanted motherboard-related electrical interference.

This arrangement is part of the product’s specialist architecture and requires careful attention during installation.

Choose the Correct M.2 Board Key

The sNI-1G is available with different M.2 board-key configurations to accommodate suitable computer motherboards.

The manufacturer identifies the following interface options:

• M.2 A+E Key
• M.2 B+M Key

The correct version depends on the motherboard’s available M.2 connection and its electrical interface.

Important: The presence of an M.2 slot does not automatically guarantee compatibility. The selected slot must provide the PCI Express functionality required by the sNI-1G.

Before ordering, confirm the motherboard model, available M.2 slot, supported PCIe connection and physical space inside the computer chassis.

Contact Chameleon Audio for assistance in selecting the appropriate version.

Dedicated Interconnection Cable

The sNI-1G uses a dedicated cable to connect its main Ethernet board to the M.2 interface board.

Although the cable uses USB Type-C-shaped connectors, it is a specialised internal connection and must not be treated as a conventional USB computer cable.

The manufacturer’s installation guide specifies the required cable orientation and connector positions.

Use only the appropriate SOtM-supplied connection arrangement, following the official installation instructions.

Incorrect cabling may prevent operation or damage the connected hardware.

Gigabit Ethernet Connectivity

The sNI-1G supports standard Ethernet networking at speeds of:

• 10Mbps
• 100Mbps
• 1000Mbps Gigabit Ethernet
• 500Mbps Giga Lite mode

The network controller supports PCI Express 1.1 or higher and complies with the relevant IEEE Ethernet standards specified by SOtM.

The card also supports features including VLAN tagging, traffic priority encoding, full-duplex flow control and Energy Efficient Ethernet.

These capabilities allow the sNI-1G to function as a conventional network interface while incorporating specialised circuitry intended for audio applications.

Flexible Internal Power Supply

Power supply design is another central element of the SOtM sNI-1G.

The card supports an internal 12V power connection using a standard 15-pin SATA power connector.

Its internal power input is specified at 12V DC, ±0.5V, with a maximum current of 1A.

Providing the network interface with a dedicated power connection is part of the manufacturer’s approach to controlling the card’s electrical environment.

The actual system wiring must follow the official SOtM installation guide.

External DC Power Supply Option

The sNI-1G also offers an external DC power input, giving system builders additional flexibility when selecting a suitable power source.

The manufacturer specifies an external input voltage range of 6.5V to 12V DC, with a maximum current requirement of 1A.

The connector uses a 5.5mm outer diameter and 2.1mm inner diameter DC barrel-jack arrangement.

Suitable external power supplies must match the required voltage, connector polarity and current capability.

SOtM recommends retaining the required internal SATA power connection even when using an external power supply, as described in the installation instructions.

Do not disconnect internal power connections or modify the wiring without following the manufacturer’s specific instructions.

Potential Matching with the SOtM sPS-550

The SOtM sPS-550 Power Supply offers selectable DC output voltages that include settings within the sNI-1G’s published external input range.

It may therefore be a relevant power supply candidate for a correctly configured system.

However, the appropriate voltage, output tolerance, connector polarity and installation requirements must be verified before making a connection.

Chameleon Audio can help confirm suitable power supply and cabling arrangements for the selected card configuration.

Internal Standby Power

The sNI-1G also provides a separate internal standby power input.

SOtM specifies an input range of 6V to 12V DC and a maximum current of 0.5A through a two-pin connector.

This connection supports the card’s intended power management architecture and should be configured strictly according to the manufacturer’s instructions.

External Clock Upgrade Possibilities

SOtM designed the sNI-1G platform with the possibility of integrating additional specialist clock hardware.

The sCLK-EX is a separately available precision clock solution used within selected SOtM audio products.

Appropriately configured sNI-1G installations can incorporate sCLK-EX-related clock arrangements, depending on the selected hardware and installation options.

The manufacturer’s guide identifies internal clock connections and selection jumpers, together with additional board-configuration requirements for certain upgrades.

These upgrades are not automatically included in the standard network card.

External master clock integration must be confirmed for the exact card and clock configuration before ordering.

Adjustable Status LED Indicators

The card incorporates status indicators for network activity and negotiated link speed.

The manufacturer identifies:

• Green LED for network activity
• Yellow LED for 100Mbps link operation
• Amber LED for 1000Mbps Gigabit link operation

The sNI-1G also includes an LED on/off jumper arrangement.

SOtM provides this option for users who prefer to disable unnecessary indicator circuitry as part of the system’s electrical-noise management approach.

Windows and Linux Compatibility

The manufacturer specifies operating-system support for:

• Microsoft Windows 7 and later versions
• Linux operating systems

Actual functionality depends on chipset driver support, operating-system version and the specific hardware platform.

Windows installations may require the appropriate network driver, available through the manufacturer.

For Linux-based music servers, compatibility should be confirmed with the selected Linux distribution and kernel version.

Designed for High-End Music Servers

The SOtM sNI-1G is intended for enthusiasts and system builders developing specialist music servers and computer-based audio transports.

It provides an alternative to the conventional integrated Ethernet ports commonly found on standard computer motherboards.

The card can be particularly relevant to dedicated systems where the motherboard, power supplies, network connections and audio output hardware are selected as part of a complete digital playback architecture.

For example, the SOtM sMS-2000 Network Streamer and Music Server incorporates specialist SOtM network interface technology within a much more extensive reference-level design.

In a suitably configured computer, the sNI-1G allows a similar focus on network interface engineering to be incorporated into a custom-built music server.

Pairing with SOtM Ethernet Cables

Network infrastructure can be developed further using suitable Ethernet cabling.

The SOtM dCBL-CAT7e Ethernet Cable combines Category 7 shielded construction with the manufacturer’s special noise-filtering approach.

It is a relevant cable option for connecting the sNI-1G to a compatible Ethernet switch, router or network device.

As always, the complete electrical installation and the properties of the connected equipment remain important.

Listening Performance and Musical Presentation

SOtM developed the sNI-1G with the objective of reducing unwanted electrical noise associated with computer-based network audio.

The manufacturer’s listening descriptions emphasise improved transparency, instrumental texture and a more spacious presentation.

Independent listening reports have also described differences in image focus, soundstage depth and perceived background noise compared with conventional network interfaces.

These impressions relate to particular listening systems and should not be interpreted as guaranteed outcomes.

The principal purpose of the card is to provide reliable Ethernet connectivity through a specialist interface engineered with additional electrical-noise management features.

International Reviews

U-Audio | SOtM sNI-1G Review

U-Audio published an independent review of the sNI-1G, examining its M.2-based connection arrangement, installation requirements, power supply options and subjective listening performance.

Read the U-Audio Review

This editorial review is written in Chinese. It should not be represented as an award or an independent laboratory certification.

Key Features

• High-end Ethernet interface developed for network audio
• PCI Express Ethernet controller
• Supports PCIe 1.1 or higher
• 10/100/1000Mbps network operation
• Additional Giga Lite 500Mbps mode
• Dedicated Ethernet transformer and common-mode filtering arrangement
• Ethernet noise-filtering design
• Filtered and buffered M.2 signal interface
• M.2 A+E Key and B+M Key options
• Dedicated main-board-to-M.2 connection cable
• Internal 12V SATA power input
• External 6.5V to 12V DC power input
• Separate internal standby power connection
• Network activity and link-speed indicators
• Selectable LED on/off configuration
• Compatible with suitable Windows and Linux systems
• Potential integration with specialist SOtM clock options
• Designed for high-performance custom music servers

Official Manual and Documentation

Download SOtM sNI-1G Installation Guide (PDF)

SOtM sNI-1G Official Product Page and Driver Information

Technical Specifications

Frequently Asked Questions

What is the SOtM sNI-1G?

It is a specialist Gigabit Ethernet network interface card developed for audio-oriented computer systems and dedicated music servers.

Does it support Gigabit Ethernet?

Yes. The card supports 10Mbps, 100Mbps and 1000Mbps Ethernet connections.

Does it fit into a conventional PCIe slot?

The sNI-1G uses a dedicated M.2 interface adapter connected to the main card. The motherboard must provide a compatible PCIe-enabled M.2 slot.

What is the difference between M.2 A+E Key and B+M Key?

These are different M.2 connector configurations. The correct version depends on the motherboard’s slot design and PCIe capabilities.

Can I install the sNI-1G in any computer?

No. M.2 interface compatibility, physical installation space, power connections and operating-system support must be verified.

Does the card require additional power?

Yes. The manufacturer specifies dedicated power connections. Installation must follow the official guide.

Can I use an external linear power supply?

A suitable external DC power supply may be used within the manufacturer’s specified voltage and current requirements, with correct polarity and wiring.

Can it work with the SOtM sPS-550?

The sPS-550 includes suitable nominal voltage settings for consideration, but exact electrical and installation compatibility must be confirmed before connection.

Is an upgraded clock included?

No. Additional clock hardware and installation options must be selected separately where available.

Does it support Windows?

Yes. SOtM lists Windows 7 and later, subject to appropriate driver support.

Does it support Linux?

Yes. Linux support is specified, with actual compatibility depending on the kernel and selected distribution.

Will the sNI-1G change my music files?

No. The card transfers Ethernet data using established networking standards. Its specialised design addresses electrical noise management rather than changing the audio data itself.

Will it improve sound quality in every system?

No. Audible differences depend on the connected equipment, the electrical environment and the complete playback system.

Is the sNI-1G suitable for a custom-built Roon server?

It may be used as a network interface in a compatible computer running Roon-related software, provided the selected operating system and hardware support the card.

Why Choose the SOtM sNI-1G?

The SOtM sNI-1G Ethernet Card combines reliable Gigabit Ethernet performance with specialist audio-oriented engineering.

Its filtered network circuitry, buffered M.2 interface, flexible power supply arrangements and optional clock integration make it an interesting choice for enthusiasts developing a dedicated high-end music server.

Purpose-Built Network Connectivity for Serious Computer Audio.

Availability and International Orders

Contact Chameleon Audio for current availability, M.2 board-key selection, compatible motherboards, power supply matching, specialist clock upgrades and international shipping.