Ethernet over Copper (EoC) is a business Ethernet service delivered over the copper telephone pairs that already run to many buildings. The carrier places equipment at both ends that uses DSL-family line technology, often bonding several pairs together, and hands the customer a standard Ethernet port. EoC filled a gap for years between slow T1 lines and costly fiber builds, and it still appears where fiber is not yet available, though many carriers are winding down copper networks.
At a glance
- EoC delivers an Ethernet hand-off over existing copper telephone pairs instead of fiber.
- Speed depends on distance from the carrier’s equipment and the number of bonded pairs; typical offerings run from a few Mbps to tens of Mbps.
- It is usually sold as a business service, often symmetrical, with a committed rate and SLA depending on the provider.
- It can install faster than a new fiber build because the copper is usually already in place.
- Availability is shrinking as carriers retire copper, so check support plans before signing a long term.
What problem it solves
Fiber is the default for business connectivity, but not every building has it, and bringing it in can mean construction, permits and months of waiting. For years, the alternative was a T1 line at 1.5 Mbps, or several bonded T1s, which quickly became too slow for cloud applications.
EoC used copper that was already in the building to deliver Ethernet at speeds well above a T1, with business-grade terms. For a site with modest bandwidth needs, it offered a quicker, cheaper path than a fiber build. Today it is mostly a fallback: a way to get a business Ethernet service at an address fiber has not reached, or a bridge while fiber construction is underway.
How it works
Copper pairs. The carrier uses existing twisted-pair copper running from its central office or a remote cabinet to the building, the same plant that once carried phone lines and T1 circuits.
Line technology. Equipment at each end uses DSL-family technology, often a symmetrical variant, to send Ethernet frames over the copper. Like DSL, it slows down as the copper gets longer, so the distance from the carrier’s equipment largely sets the speed available.
Bonding. Carriers often bond two, four or more pairs into one service. Bonding raises the available speed and can let the circuit keep running at reduced speed if one pair fails, depending on the equipment.
Hand-off. At the customer site, the carrier’s device presents an Ethernet port, usually at the demarcation point. From the customer’s side, it looks like any other Ethernet service.
Service types. EoC can carry internet access, often sold with business terms similar to dedicated internet access, or point-to-point and multipoint Carrier Ethernet services between sites. Committed rates, SLAs and static IP options vary by provider.
To compare EoC with fiber, cable and wireless options at your address, see our Internet Access solution page.
When it matters for buyers
- Fiber is unavailable or costly. EoC can provide business Ethernet while you wait for a fiber build, or where one is not justified.
- Replacing T1 lines. Sites still on T1s may get several times the speed from EoC, if copper services are still sold there.
- Carrier copper retirement. If your carrier announces copper retirement, plan a move to fiber, fixed wireless, cable or cellular before the deadline.
- Renewals. An older EoC contract may cost more than a faster fiber or cable service now available at the same address.
- Backup links. EoC on copper can take a different physical path from a primary fiber circuit, which may help with resilience; confirm the actual route.
Questions to ask vendors
- What speed can you deliver at our address, and how many copper pairs will be bonded?
- Is the service symmetrical, and is the rate committed or best effort?
- What SLA covers availability and repair time?
- Is copper service still sold and supported in this area, and do you have retirement plans that would affect us during the term?
- If we later move to fiber, can we upgrade without early termination fees?
- Where is the demarc, and what equipment and power will you need on site?
How it differs from DSL
Both use copper telephone lines and related line technology. DSL is usually a consumer or small-business broadband product: often asymmetrical, sold with “up to” speeds and limited repair commitments. EoC is typically sold as a business Ethernet service, often symmetrical, frequently bonding several pairs, and usually with a committed rate and SLA. The line may look similar; the service terms and expectations are different.