Single Pair Ethernet Switches & Media Converters
Single Pair Ethernet (SPE) Switches & Media Converters
Industrial 10BASE-T1L hardware that brings Ethernet to the field over a single twisted pair — up to 1,000 m on cabling you may already have in conduit. Authorized distribution from Automation Distribution.
Single Pair Ethernet (SPE) is the IEEE 802.3cg standard that carries 10 Mbit/s Ethernet over one twisted pair of conductors at distances up to 1,000 meters. It replaces traditional 4–20 mA loops, HART, and proprietary 2-wire fieldbuses with native IP communication from the sensor to the controller — and on to the cloud — without protocol gateways. Automation Distribution stocks SPE switches and media converters for industrial control panel builders, OEM machine designers, process plant integrators, and building automation contractors migrating to Ethernet-to-the-edge.
What Is Single Pair Ethernet?
Single Pair Ethernet refers to a family of IEEE 802.3 standards that transmit Ethernet over two conductors instead of the four pairs used in conventional 100BASE-TX or 1000BASE-T cabling. The variant most relevant to industrial automation is 10BASE-T1L (IEEE 802.3cg-2019), which delivers:
| SPE Variant | Speed | Reach | Typical Use |
|---|---|---|---|
| 10BASE-T1L (IEEE 802.3cg) | 10 Mbit/s | Up to 1,000 m | Process automation, building automation, decentralized sensors, brownfield fieldbus migration |
| 10BASE-T1S (IEEE 802.3cg) | 10 Mbit/s | Up to 25 m, multidrop | Short multidrop sensor/actuator buses replacing CAN or LIN |
| 100BASE-T1 (IEEE 802.3bw) | 100 Mbit/s | Up to 15 m | Automotive, in-machine networking |
| 1000BASE-T1 (IEEE 802.3bp) | 1 Gbit/s | Up to 15–40 m | Vehicle networks, high-bandwidth in-machine links |
The products in this category target industrial 10BASE-T1L applications — the variant designed specifically for process plants, factories, and buildings where cable runs are long and the existing infrastructure is two-wire.
Why Migrate to Single Pair Ethernet?
| Driver | What It Delivers in the Field |
|---|---|
| 10× the reach of 100BASE-TX | 1,000 m vs. 100 m on Cat 5. Connect remote sensors, pump stations, outdoor enclosures, and tank farms to the control network without intermediate switches, fiber media converters, or DSL modems. |
| Reuse existing 2-wire cabling | 10BASE-T1L is engineered to run on instrumentation cable already pulled in conduit — including PROFIBUS PA and Foundation Fieldbus Type A cable. Migrate fieldbus to Ethernet without re-pulling wire. |
| Up to 60% weight and material savings | Two conductors instead of eight. Less copper, less cable tray real estate, faster pulls, lower BOM cost on long runs and dense sensor networks. |
| Native IP communication | Sensors and field devices speak Ethernet protocols (PROFINET, EtherNet/IP, Modbus TCP, OPC UA, MQTT) end-to-end. No protocol gateways, no signal converters, no translation overhead between field and IT. |
| Power over Data Line (PoDL) | The same two wires can deliver up to 50 W to powered SPE devices on PoDL-equipped switches. One cable for power and data — useful for cameras, smart sensors, and remote condition-monitoring devices. |
| Ethernet-APL ready | Ethernet-APL (Advanced Physical Layer) builds on 10BASE-T1L to add intrinsic safety for hazardous-area process automation in oil & gas, pharmaceutical, food & beverage, and chemical plants. |
Shop SPE Products by Application
The right SPE hardware depends on whether you're aggregating multiple field devices into a switch or extending a single device across a long run.
| If Your Application Is… | You Need… | Featured Product |
|---|---|---|
| Aggregating multiple SPE devices into a control network | An SPE switch with multiple 10BASE-T1L ports and RJ-45 uplinks | WAGO 852-2112 — 4-port SPE switch with 2 RJ-45 uplinks, 1,000 m reach, lever-actuated SPE connectors, -40°C to +70°C, UL listed. |
| Extending a single Ethernet device over a long run | A point-to-point SPE-to-RJ-45 media converter | WAGO 852-1705 — 10BASE-T1L to 10BASE-T media converter, replaces DSL modems and short fiber links between buildings or machines. |
| Replacing a 4–20 mA, HART, or fieldbus run | An SPE switch on the control side + 10BASE-T1L-equipped field devices | Pair the WAGO 852-2112 with SPE-capable field hardware. Existing twisted-pair cabling can usually be reused. |
| Networking sensors over an existing Ethernet backbone | An SPE switch uplinked to your standard 100/1000 Mbit/s network | The WAGO 852-2112's two 10/100BASE-TX RJ-45 ports plug directly into any standard managed or unmanaged Ethernet switch. |
Typical Industrial SPE Use Cases
| Industry / Application | How SPE Solves It |
|---|---|
| Water & wastewater | Pump stations, lift stations, and remote chemical-feed cabinets often sit hundreds of meters from the SCADA panel. SPE delivers Ethernet to those cabinets over the existing two-wire run, eliminating fiber transceivers and DSL modems. |
| Oil & gas surface installations | Wellhead controllers, tank-level transmitters, and metering skids are spread across acres. With Ethernet-APL on top of 10BASE-T1L, IP communication reaches into Zone 1/2 hazardous areas. |
| Process plants (food & beverage, pharma, chemical) | Replace 4–20 mA + HART loops with native Ethernet from each instrument. Recover device parameters, diagnostics, and software updates over the same wire that used to carry one process variable. |
| Building automation | HVAC controllers, lighting nodes, occupancy sensors, and energy meters consolidate onto a single SPE infrastructure rather than parallel BACnet, KNX, DALI, and Modbus runs. |
| Discrete machine OEMs | Machine builders integrating SPE-equipped vision systems, smart cameras, encoders, and condition-monitoring sensors get a UL-listed switch with RJ-45 uplinks — no firmware management required for the SPE leg of the network. |
| Brownfield retrofits | Plants modernizing decades-old fieldbus or 4–20 mA installations can pull SPE through existing conduit on existing twisted-pair cable, dramatically lowering capital cost vs. a full Cat 5 re-pull. |
How to Choose the Right SPE Hardware
Five questions narrow the selection quickly:
| Question | What to Look For |
|---|---|
| How many SPE devices on this run? | One device → media converter (e.g., WAGO 852-1705). Multiple devices → SPE switch with 4+ T1L ports (e.g., WAGO 852-2112). |
| Do field devices need power on the SPE line? | Yes → specify a switch with PoDL output and confirm the PoDL class matches your devices. No → data-only switches (like the WAGO 852-2112) keep the BOM simpler and the cabinet thermal load lower. |
| What's the ambient temperature in the cabinet? | Outdoor or unconditioned enclosures need -40°C to +70°C-rated hardware. Some emerging SPE devices on the market are limited to 0°C or +60°C — verify before specifying for harsh environments. |
| What approvals does the panel require? | North American panel builds typically require UL 61010-2-201 listing. Check that the switch carries it (not just CE/CB) before specifying into NRTL-listed assemblies. |
| Managed or unmanaged? | Most SPE deployments today are unmanaged (plug-and-play) because the SPE leg connects sensors and edge devices, not infrastructure. Specify managed only if you need VLAN, RSTP, SNMP, or PROFINET-aware switching at the SPE layer. |
Why WAGO for Single Pair Ethernet
WAGO has been an active member of the Single Pair Ethernet System Alliance (SPESA) since 2022 and brings two specific advantages to industrial SPE deployment:
- Lever-actuated SPE termination — the same CAGE CLAMP® lever connector technology WAGO is known for, applied to SPE. Tool-free termination, accepts solid/stranded/ferruled conductors, supports rework without re-cutting cable.
- Freely selectable polarity on T1L ports — D+ and D- can be terminated in either orientation, eliminating wiring errors at the field device.
- Industrial temperature range — WAGO's SPE switches share the same -40°C to +70°C envelope as the rest of the 852-series industrial Ethernet line.
- UL 61010-2-201 listed — certificate E175199, suiting the products to North American industrial control panel assemblies.
- Compatible with the WAGO ecosystem — the SPE switches share the 12–48 VDC supply rail, DIN-35 rail mount, and Push-in CAGE CLAMP® connector family already used by WAGO PFC controllers, 750/753 I/O, and BASE/ECO/PRO2 power supplies.
Frequently Asked Questions About Single Pair Ethernet
Q: What is Single Pair Ethernet (SPE)?
Single Pair Ethernet is a family of IEEE 802.3 standards that transmits Ethernet over a single twisted pair of conductors. The industrial automation variant is 10BASE-T1L (IEEE 802.3cg), which delivers 10 Mbit/s over distances up to 1,000 meters on shielded twisted-pair cable.
Q: How is 10BASE-T1L different from regular Ethernet?
Conventional 100BASE-TX uses four pairs of conductors and is limited to 100 m. 10BASE-T1L uses one pair and reaches 1,000 m at 10 Mbit/s. Above the physical layer it's compatible with standard Ethernet protocols, so existing IP, PROFINET, EtherNet/IP, and Modbus TCP networks integrate without translation.
Q: Can SPE reuse existing fieldbus cabling?
Often yes. 10BASE-T1L was designed to work with shielded twisted-pair cables that meet specific return-loss and insertion-loss requirements — including PROFIBUS PA and Foundation Fieldbus Type A cables already installed in many process plants. Confirm the specific cable type's compliance with the SPE switch manufacturer's recommendations before reuse.
Q: What is Power over Data Line (PoDL)?
PoDL is the SPE equivalent of PoE: it delivers DC power to a connected field device over the same twisted pair that carries data. The IEEE 802.3cg standard defines PoDL classes from approximately 0.5 W up to about 50 W. Not every SPE switch sources PoDL — check the product datasheet.
Q: What is Ethernet-APL?
Ethernet-APL (Advanced Physical Layer) is a specification built on top of 10BASE-T1L that adds intrinsic safety for hazardous-area process automation. APL is supported by PROFIBUS & PROFINET International, ODVA, and FieldComm Group, and targets installations in oil & gas, pharmaceutical, food & beverage, and chemical plants.
Q: Do I need a managed SPE switch?
Most SPE deployments today are unmanaged because the SPE leg of the network connects sensors and edge devices rather than infrastructure. Choose a managed SPE switch only if you need VLAN, RSTP, SNMP, or PROFINET-aware switching at the SPE layer.
Q: What's the difference between an SPE switch and an SPE media converter?
An SPE switch (e.g., WAGO 852-2112) aggregates multiple 10BASE-T1L ports and provides RJ-45 uplinks — it consolidates several SPE field devices into a single point on the control network. An SPE media converter (e.g., WAGO 852-1705) is a one-to-one device that translates a single 10BASE-T1L link to a single RJ-45 link — used to extend one Ethernet device across a long run.
Q: Where can I buy industrial Single Pair Ethernet hardware?
Automation Distribution is an authorized WAGO distributor and stocks the WAGO 852-2112 SPE switch and the 852-1705 SPE media converter, along with the broader 852-series industrial Ethernet switch line. Contact us for current lead time, project pricing, and application support.
Migrating to Single Pair Ethernet? We Can Help.
Automation Distribution carries the full WAGO 852-series industrial Ethernet portfolio and provides application support for SPE deployments — from drop-in 4–20 mA replacements to multi-site Ethernet-APL process networks. Request a quote or contact our team for design assistance and project pricing.