4m SC/APC to SC/APC Simplex Single Mode Fiber Patch Cable, OS2 9/125 Corning, LSZH/OFNR, Yellow

The CableLeader FB121-96XX is an OS2 simplex patch cable: one single mode fiber in one 2.0 mm jacket, terminated with a green SC/APC connector on each end. The construction mirrors how the access network actually works — GPON and FTTH links carry downstream and upstream traffic on a single strand — so the wall-outlet-to-ONT extension inside a home or apartment is a one-fiber, SC/APC-to-SC/APC run. This family serves exactly that link at lengths from 0.5 m through 30 m.

APC — angled physical contact — polishes each ferrule endface at an 8-degree angle, redirecting back-reflection into the cladding rather than straight back toward the source. The result is a minimum return loss of 65 dB, meaningfully higher than the 55 dB of UPC, and the reason FTTH, GPON, and RF-over-glass standards specify angled connectors. Each SC/APC end is factory-tested to 0.30 dB maximum insertion loss at 1310/1550 nm.

The push-pull SC body with keyed housing and 31.8 mm boot is the dominant connector on fiber wall plates, GPON splitters, and ONT uplinks. Green housings mark the APC polish: this cable mates only with green APC receptacles, and forcing it into a blue UPC port damages both angled ferrules and produces high, permanent loss.

The jacket is LSZH/OFNR rated under UL file E510298. Low-smoke zero-halogen material limits toxic emissions in enclosed living spaces, while the OFNR riser rating permits vertical runs between floors — relevant when the 20 m and 30 m variants climb building risers. This is an indoor patch cable; unlike armored outdoor drop cables, it routes cleanly behind furniture and along baseboards. RoHS compliance covers procurement requirements.

The Corning G657A1 fiber grade is bend insensitive, tolerating the tight bends of door frames, baseboards, and wall enclosures without the attenuation spikes standard G652D fiber shows under the same handling. It remains fully compatible with installed G652D single mode plant, dropping into existing OS2 outlets, splice trays, and distribution panels. The single 2.0 mm strand is also easier to conceal than a duplex zipcord, a practical advantage on visible in-home runs.

Compatibility & Ordering Information — FB121-96XX mates with SC/APC (green, angled) single mode ports: fiber wall outlets, GPON splitters, ONT uplinks, and APC distribution panels. Never plug it into blue UPC receptacles. The family is offered from 0.5 m through 30 m; measure the wall-outlet-to-ONT path including baseboard routing and add a service loop. For two-fiber APC links see the FB114-96XX duplex family; for a blue LC/UPC simplex format see FB119-91XX.

Product Comparison: Simplex vs Duplex SC/APC Single Mode Patch Cable

Both cables use identical Corning OS2 9/125 G657A1 fiber and green 8-degree SC/APC connectors; the difference is the number of fibers, which must match how the link carries traffic. The table summarizes the decision:

Select the simplex version (this product) for the standard single-fiber FTTH case — wall outlet to ONT, GPON extensions, RF-over-glass runs.
Select the duplex version when the equipment uses separate transmit and receive fibers. Both are indoor LSZH/OFNR patch cables — for outdoor, buried, or rodent-exposed paths an armored drop cable is the appropriate construction instead. All APC connectors mate only with green APC ports, never blue UPC.

FAQ

What is the difference between simplex and duplex SC/APC cables?

Simplex carries one fiber; duplex carries two in a zipcord pair. GPON and FTTH links transmit both directions on a single strand, so the wall-outlet-to-ONT extension needs exactly this simplex construction, while duplex SC/APC serves equipment that uses separate transmit and receive fibers. Both share the same green 8-degree APC connectors and 65 dB minimum return loss.

Is this cable compatible with my FTTH wall outlet and ONT?

Yes, if both ports are green SC/APC — the standard on fiber wall plates and ONT uplinks. Connect the single strand from outlet to ONT and the link is complete; GPON needs only one fiber. Do not plug either end into a blue UPC port, and note that most ONT data ports (Ethernet) are separate from this optical uplink.

What length should I order for an in-home fiber extension?

Measure the actual routing path — along baseboards, around door frames, up risers — not the straight-line distance, then add about one meter as a service loop. The family spans 0.5 m to 30 m, so a cross-room ONT relocation typically takes 5 m to 15 m while a cross-floor run may need 20 m or 30 m.

How do I route and connect this cable at home?

Plug the green SC/APC connectors straight into the wall outlet and ONT until they click — push-pull SC bodies need no tools. Route the 2.0 mm cable along baseboards and door frames; the G657A1 bend insensitive fiber tolerates tight corners without signal loss. Avoid pinching it under doors, and never force a connector into a blue UPC port.

Which fiber internet cable is best — standard or armored?

Choose this standard LSZH/OFNR simplex cable for indoor wall-outlet-to-ONT runs: it is thinner, routes cleanly along baseboards, and carries the riser fire rating. Armored cables add a protective layer for outdoor, buried, or rodent-exposed paths and are correspondingly stiffer and thicker. For a normal in-home FTTH extension, the indoor cable is the right choice.