The Common Vocabulary
The term Fiber to the X (FTTX) describes any access architecture where fiber replaces some portion of the copper outside plant. The X identifies the termination point: the home, the node, the curb, the building, or the premises. Each variation pushes fiber deeper into the network, replacing more copper as it goes.
From shortest fiber to longest:
- FTTN — Fiber to the Node (street-side cabinet)
- FTTC — Fiber to the Curb (closer cabinet, usually under 300m of copper)
- FTTdp — Fiber to the Distribution Point (last 100m on copper using G.fast)
- FTTB — Fiber to the Building (basement of MDU, copper to apartments)
- FTTH — Fiber to the Home (fiber all the way to the residence)
- FTTP — Fiber to the Premises (umbrella term covering FTTH and FTTB)
Side-by-Side Comparison
| Architecture | Fiber Termination | Last-Mile Tech | Typical Speed | Common Use |
|---|---|---|---|---|
| FTTN | Street cabinet (300-1500m from home) | VDSL2 | 50-100 Mbps | Legacy telco modernization |
| FTTC | Curbside cabinet (under 300m) | VDSL2 / G.fast | 200-500 Mbps | Suburban brownfield |
| FTTdp | Pole or pedestal (under 100m) | G.fast | 500-1000 Mbps | European deployments, MDU |
| FTTB | MDU basement | Cat5e/Cat6 Ethernet, G.fast, MoCA | 1 Gbps | Apartments, condos |
| FTTH | Inside the home (ONT) | None (pure fiber) | 1-25 Gbps | New residential builds |
| FTTP | Inside the premises | None or short copper LAN | 1-25 Gbps | Marketing umbrella term |
FTTH (Fiber to the Home)
The gold standard. Fiber runs from the central office or hub through the outside plant, into the customer's home, and terminates on an ONT. The customer's LAN runs Ethernet or WiFi from the ONT. No copper bottleneck.
Architectures: GPON, XGS-PON, 25G-PON, or active Ethernet. PON dominates residential because it shares one fiber across 32-128 subscribers via a passive splitter. See our XGS-PON vs GPON vs 25G-PON comparison.
For installers, FTTH is the simplest architecture to commission: optical power at the ONT, register with OLT, done. No copper testing required.
FTTB (Fiber to the Building)
Common in apartment buildings, condos, and dense urban housing where running individual fibers to each unit is expensive. Fiber terminates at a basement or wiring closet on a building-level switch or PON OLT. Each apartment gets a copper extension (Cat5e/Cat6 Ethernet, G.fast, or MoCA).
For installers, FTTB combines fiber commissioning at the building entrance with copper or G.fast testing for the in-building extensions. Two distinct skill sets and two test kits.
FTTN (Fiber to the Node)
Fiber runs from the central office to a street-side cabinet. From the cabinet, existing twisted-pair copper carries the service the remaining 300-1500m to the home using VDSL2 or G.fast. Common in legacy telco footprints from 2010-2020 modernization.
FTTN's main limitation is copper distance. Speeds drop sharply with loop length. A subscriber 1500m from the cabinet might see 30 Mbps; a subscriber 300m from the cabinet might see 100 Mbps on the same DSLAM.
For installers, FTTN visits are usually copper-side: VDSL2 modem swap, line testing with a copper test set. Fiber tools are needed only at the cabinet itself.
FTTC (Fiber to the Curb) and FTTdp (Fiber to the Distribution Point)
Same idea as FTTN but with the cabinet pushed closer to the customer. FTTC cabinets typically serve 16-32 subscribers within 300m. FTTdp pushes the active electronics to a pole-mount or pedestal within 100m, enabling G.fast for near-gigabit speeds over short copper runs.
FTTC and FTTdp are common in European deployments where the existing copper plant is in good condition and full FTTH is not yet economically justified. Less common in North America.
Why It Matters for Installers
The acronym determines what tools you need and what you are tested on at handoff.
| Architecture | Fiber Tools | Copper Tools | Customer-Side Skill |
|---|---|---|---|
| FTTH | Required (PON meter, OTDR, microscope) | None | ONT install, WiFi config |
| FTTB | Required at building entrance | Required for in-building copper | Switch config, Ethernet runs |
| FTTN/FTTC | Cabinet only | Required (VDSL line tester) | VDSL modem swap, line conditioning |
| FTTdp | Distribution point | G.fast tester | G.fast modem install |
Crews specializing in FTTH need fewer copper tools but a deeper PON test bench. The New Hire Fiber Tech Bundle covers everything an FTTH-only tech needs.
Performance Differences
Speed
FTTH delivers symmetric multi-gigabit speeds with no distance penalty inside the typical PON reach. FTTN is asymmetric and degrades quickly with loop length. The gap between an FTTH subscriber and an FTTN subscriber on the same operator can be 10x or more in download speed.
Latency
FTTH PON latency is 1-3 ms inside the access network. VDSL2 adds 5-15 ms of additional latency from line conditioning. For interactive applications (cloud gaming, video calls) FTTH is noticeably better.
Reliability
Fiber is immune to electromagnetic interference and unaffected by weather (other than the rare physical cable cut). Copper plant suffers from water intrusion, cross-talk, and degraded splices over time. FTTH operators report fewer truck rolls per subscriber per year.
Test Equipment Recommendations
XGS/GPON Power Meter
$484.99 — Required for FTTH commissioning regardless of split architecture.
Fiber Ranger OTDR
$579.99 — Characterizes feeder and distribution fiber for FTTH and FTTB builds.
WiFi Fiber Microscope
$1,249.99 — Connector inspection on every mated pair.
Optical Power Meter (LC)
$339.99 — General-purpose meter for FTTB feeder and patch testing.
Migration Path
Most operators are progressively replacing FTTN and FTTC footprints with FTTH. The transition typically follows:
- Deploy FTTH overbuild parallel to existing FTTN copper
- Migrate subscribers one at a time as service plans upgrade
- Decommission FTTN cabinets when subscriber base falls below threshold
- Remove copper plant where right-of-way costs justify it
For installers, this means a steady increase in FTTH work and a steady decrease in copper service calls over the 2025-2030 horizon.
Frequently Asked Questions
Is fixed wireless an FTTX architecture?
No. Fixed wireless access (FWA) uses cellular or licensed wireless from a tower to the home. The tower is typically fed by fiber, but the last mile is RF, not copper or fiber. FWA is sometimes marketed as a competitor to FTTH in markets where running fiber is impractical.
What about cable internet (DOCSIS)?
Cable networks are HFC (Hybrid Fiber Coax). Fiber runs to the node; coax to the home. Architecturally similar to FTTN but with coax instead of twisted-pair copper. Modern DOCSIS 4.0 reaches multi-gigabit speeds on existing coax.
Does FTTP always include phone service?
Optionally. Most FTTP ONTs include analog telephone (POTS) ports, but the operator may or may not offer voice service. Voice over fiber uses SIP back to the carrier softswitch.
What is the cheapest architecture to deploy?
FTTN is cheapest in greenfield modernization where copper plant already exists. FTTH is cheapest in greenfield new construction because trenching for copper and fiber costs the same. Cost crossover for brownfield FTTH overbuild varies widely by density and labor cost.
The Bottom Line
The acronym tells you where the fiber stops. FTTH is the long-term winner for residential access; FTTN, FTTC, and FTTB are transitional architectures still in service across many North American footprints.
For installers, knowing which architecture you are working on tells you what tools to load on the truck and what test results to expect. For more on the specific FTTH testing workflow see our installation checklist and drop cable testing guide.