Beyond 100m: Transmitting Ethernet and PoE over 2-Wire Cables

An overview of using existing two-conductor paths, twisted or untwisted, to carry IP video and PoE beyond the 100 m / 328 ft Ethernet limit.

“2-Wire” means virtually any qualified two-conductor path, twisted or untwisted, with performance determined by gauge, construction, distance, and camera power load.

When Is 2-Wire Extension the Right Choice?

Many retrofit sites have only two conductors available and pulling new cable may be the biggest cost or very difficult.

Use a 2-Wire extender when:

  • Only two conductors are available to the remote device
  • New conduit, trenching, or elevator downtime adds cost
  • Existing elevator, alarm, intercom, or gate wiring can be reused
  • The endpoint needs Ethernet data and power while no local power available. 
The value is not just distance; it is saving the existing path when the path is hard to replace.

Major Application: Elevator Connections

Why elevators are a strong application:

  • Traveler cables may include flat, shielded, alarm, phone, or other non-twisted conductors
  • Cable replacement can involve elevator downtime and specialty labor
  • Cameras, CCTV, intercom, and emergency-phone upgrades can reuse existing paths
Use the wire that is already moving with the cab.

One 2-Wire Link Carries Data, and PoE

A long-distance 2-wire carries:

Ethernet data:

  • IP Video
  • Network timing and negotiation
  • Camera-specific traffic (RTSP, ONVIF, multicast)

PoE power (802.3af/at)

This is a modulated, conditioned, and restored Ethernet link engineered for long-distance performance.

How the Extended 2-Wire Link Works

A 2-wire extender operates as a point-to-point link, with two endpoint units working together to carry Ethernet and PoE over an existing two-conductor run.

  • Control-side unit connects to the network switch/PSE and converts Ethernet to be transmitted over 2 conductors.
  • Remote unit restores Ethernet and PoE for the camera or IP device.
To the network, the endpoint behaves like a standard Ethernet device over a cable path that may be far longer than 100 m.

Distance, Data Rate & PoE Depend on the Wire

A typical performance of G.hn technology

Wire effects: Twisted, untwisted, and different gauges perform differently over distance.
PoE effects: Higher loop resistance reduces power available at the remote device.

Installation Factors That Affect Performance

Actual performance is shaped by the cable path, device load, and installation environment:

  • Conductor gauge, copper quality, and current capacity
  • Direct-run condition; splices and jumpers can reduce performance
  • Polarity, terminations, corrosion, and connector quality
  • Grounding, surge protection, and electrical noise exposure
  • Camera load including IR, heater, PTZ motors, and accessories
Old cable paths may have hidden splices, oxidized terminals, or lower current capacity that affect IP and PoE performance.

How to Choose a 2-Wire Extender?

Application
Elevator, alarm, emergency phone, gate, access control, or camera retrofit?

Wire path
Twisted, untwisted, flat, shielded, alarm, traveler, or other qualified two-conductor wiring?

Distance + speed
What data rate is required at the actual distance?

Power budget
How much power the remote device needs

Environment
Is it rated for operation in the remote environment?

How The 2-Wire Technologies Compare?

TechnologyCable TypeSpeedDistance / Rate​Primary Applications​
SPE1-pair UTP/STP10 Mb/s1 km @ 10 Mb/sSensors/actuators; robotics; building automation/APL.
VDSL21-pair Cat3/5 UTP200–300 Mb/s0.3/1/2 km: 300/100/25 Mb/sLegacy LAN; IP cameras/APs; campus/floor retrofit.
G.fast1-pair phone wire~1 Gb/s<300 m best; ~500 m reducedShort-building/FTTB retrofit; high-speed copper.
G.hn
2-wire phone/coax/power~2 Gb/s PHY100s m; some links ~1 kmMDU/hospitality; broadband/IP-camera retrofit.
G.SHDSL1-pair telecom wire5.7–15 Mb/sSeveral km; 6+ km at low rateSCADA/telemetry; rail/roadside; remote industry.
HomePlugAC/DC power wiring~1–2 Gb/s PHY~300 m typical; wiring dependentHome/light-commercial LAN; temporary IP/energy.
SPE is optimized for defined single-pair channels. 2-Wire extenders are for qualified existing conductors, including elevator traveler, alarm, and other nonstandard paths.

Vigitron’s OmniiCopper Vi27001 Series

Ethernet & PoE over 2-Wire remote unitSingle-port companion unit for one link4-port receiver for
multi-channel installations		Rack shelf for 4-port receiver configurations
Vi27000Vi27001Vi27004Vi5000R

Vigitron 2-Wire Product Highlights

Reach + Speed

  • Up to 3,000 ft / 914 m over 24/2 to 16/2 two-conductor wires
  • Up to 100 Mb/s network speeds

Power + Reliability

  • PoE input or 48–57VDC local power; up to 36W PoE capability
  • IEEE 802.3af/at, RFC-2544 tested,
  • -30°C to +65°C operation

Wire Compatibility

  • Compatible with UTP, STP, and untwisted pairs
  • Designed for virtually any existing two-conductor building wiring

Plug & Play

  • No switch settings or network programming required.
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