8F Butterfly Flat Indoor FTTH Drop Cable

8‑fiber butterfly flat indoor FTTH drop cable with central fiber and dual parallel strength members

LSZH flame‑retardant jacket, small size, flexible, bend‑insensitive, and easy to install

Complies with ITU‑T G.657A1/A2 fiber, offering low loss and stable high‑bandwidth transmission

Excellent mechanical, temperature, and humidity resistance for reliable indoor operation

Suitable for FTTH, access networks, LAN, and indoor terminal equipment connections

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Product Description
Specification
Product Advantage

Product Description

1 Scope

This specification defines the structure, optical, mechanical, environmental, and connector performance requirements for 8‑fiber butterfly flat indoor FTTH drop cables used in indoor cabling, premises distribution, access networks, and direct end‑user connections.

2 General Description

The cable adopts a butterfly flat structure with optical fiber unit(s) in the center, two parallel strength members on both sides, and an LSZH outer jacket. It features small dimension, flexibility, water resistance, good bend performance, easy stripping and splicing, and stable transmission under indoor conditions.

3 Cable Structure

• Optical fiber(s) at center

• Two parallel strength members: FRP / KFRP / solid steel wire

• Sheath: Low Smoke Zero Halogen (LSZH), flame retardant

• Color: White or black optional

• Strength member diameter: 0.45–0.52 mm

• Cable dimension (approx.): 2.0(±0.1) mm × 4.0(±0.2) mm

• Cable weight (approx.): 8.5 / 11.5 kg/km

Specification

4 Optical Fiber Specifications

Fiber type complies with ITU‑T G.657A1 / G.657A2

4.1 G.657A1

Item	Unit	Value
Mode field diameter @1310 nm	μm	8.6–9.5 ±0.4
Cladding diameter	μm	125.0 ±0.7
Cladding non‑circularity	%	≤1.0
Core/cladding concentricity error	μm	≤0.5
Coating diameter	μm	245 ±5
Cable cut‑off wavelength	nm	≤1260
Attenuation @1310 nm	dB/km	≤0.36
Attenuation @1550 nm	dB/km	≤0.22
Macro‑bend loss @1550 nm (1 turn, 10 mm radius)	dB/km	≤0.75
Macro‑bend loss @1625 nm (1 turn, 10 mm radius)	dB/km	≤1.5
Proof stress level	kpsi	≥100

4.2 G.657A2

Item	Unit	Value
Mode field diameter @1310 nm	μm	8.6–9.5 ±0.4
Cladding diameter	μm	125.0 ±0.7
Cladding non‑circularity	%	≤1.0
Core/cladding concentricity error	μm	≤0.5
Coating diameter	μm	245 ±5
Cable cut‑off wavelength	nm	≤1260
Attenuation @1310 nm	dB/km	≤0.36
Attenuation @1550 nm	dB/km	≤0.22
Macro‑bend loss @1550 nm (1 turn, 7.5 mm radius)	dB/km	≤0.5
Macro‑bend loss @1625 nm (1 turn, 7.5 mm radius)	dB/km	≤1.0
Proof stress level	kpsi	≥100

5 Connector Performance (Optical)

Test condition: 1310 nm LED light source

Parameter	UPC	APC
Insertion Loss	<0.3 dB	<0.3 dB
Return Loss	>50 dB	>60 dB

6 Mechanical Performance

Max. insertion loss change <0.2 dB for all items

Test	Condition
Vibration	10–55 Hz, 1.5 mm (p‑p)
Flex	0.9 kg, −90° ~ +90°, 100 cycles
Torsion	1.35 kg, −90° ~ +90°, 10 times
Tensile	90 N, 10 min
Drop	1.5 m, 8 drops total
Exchangeability	Random mating
Durability	500 mate‑demate cycles

7 Environmental Performance

Max. insertion loss change <0.2 dB for all items

Test	Condition
High temperature	+85 °C, 168 h
Temperature cycle	−40 °C ~ +75 °C, 21 cycles, 168 h
Humidity aging	+75 °C, 95 %RH, 168 h
Humidity/condensation cycle	−10 °C ~ +65 °C, 90–100 %RH, 14 cycles, 168 h

8 Cable Mechanical & Environmental Ratings

Item	Value
Short/Long term tensile (steel)	200 N / 100 N
Short/Long term tensile (KFRP)	80 N / 40 N
Short/Long term crush resistance	1000 N/100 mm / 500 N/100 mm
Operating temperature	−40 °C ~ +70 °C

9 Mechanical Test Requirements (IEC 60794‑1‑2)

Test	Standard	Requirement
Tension	E1	Additional attenuation ≤0.4 dB
Crush	E3	Additional attenuation ≤0.4 dB
Impact	E4	Additional attenuation ≤0.4 dB
Repeated bending	E6	Additional attenuation ≤0.4 dB
Temperature cycling	F1	Attenuation change ≤0.4 dB/km

10 End‑Face Quality (Single Mode)

Compliant with IEC 61300‑3‑35:2015
No scratches or defects allowed in zones A–E

Zone	Range (μm)	Requirement
A (Core)	0–25	No scratches, no defects
B (Cladding)	25–115	No scratches, no defects
C (Adhesive)	115–135	No scratches, no defects
D (Contact)	135–250	No scratches, no defects
E (Rest of ferrule)	Full	No scratches, no defects

11 Connector Standards

• SC: IEC 61754‑4, TIA/EIA FOCIS3, GR‑326, JIS C5973

• LC: IEC 61754‑20, TIA/EIA FOCIS10, GR‑326, EIA/TIA‑604‑10, JIS C5973

12 Key Features

• Good mechanical and environmental stability

• Simple, lightweight structure

• LSZH flame‑retardant, low‑smoke, zero halogen jacket

• Easy stripping and splicing

• Excellent anti‑electromagnetic interference and crush resistance

• Bend‑insensitive fiber for high bandwidth and stable transmission

13 Applications

• FTTH indoor cabling

• Access networks

• Local area networks (LAN)

• Premises distribution systems

• Connection to ONU, terminal boxes, wall outlets

Product Advantage

1

Simple and lightweight butterfly flat structure, easy to install and maintain.
2

LSZH jacket with flame-retardant, low-smoke and zero-halogen properties, safe for indoor use.
3

Bend-insensitive fiber ensures high bandwidth and stable transmission performance.
4

Dual parallel strength members provide excellent anti-electromagnetic interference and crush resistance.
5

Good mechanical and environmental stability, adaptable to various indoor working conditions.
6

Low attenuation, compliant with ITU-T G.657 standards, ensuring reliable signal transmission.