| Category | Indoor Tight Buffer Fiber Optic Cable, OS2 / OM2 / OM3 / OM4 |
| Fiber Core | 1–48 cores (order in 04, 06, 08… increments) |
| Strength Member | Aramid yarn (all-dielectric) |
| Jacket | LSZH |
| Standards | ISO/IEC 11801, ITU-T G.651/G.652/G.655/G.657, IEC 60793/60794 series |
| Certifications | RoHSCE |
| Packaging | Reel-packed indoor cable, custom core count & length available |
Heizka’s Indoor Tight Buffer Fiber Optic Cable is an all-dielectric, tight-buffered fiber solution engineered for structured cabling inside buildings, data centers, and telecom rooms. Built around an aramid yarn strength member and a compact 0.9mm tight-buffered construction, it is available in singlemode OS2 or multimode OM2/OM3/OM4 fiber types with an LSZH jacket for safe, code-compliant indoor routing.
Because the cable is fully dielectric, it is immune to electromagnetic interference and safe to route alongside power cabling, making it a dependable choice for LAN backbones, fiber-to-the-desk deployments, and data center cross-connects. Every reel is manufactured and tested to ISO/IEC 11801, ITU-T G.651/G.652/G.655/G.657, and IEC 60793/60794 standards, and backed by Heizka’s multi-year warranty for long-term field performance.
Features
- ✓Tight-buffered fiber construction, easy for stripping and termination
- ✓Aramid yarn strength member for excellent tensile strength performance
- ✓All-dielectric structure, immune to electromagnetic influence
- ✓Light-weight, high-flexibility design with small bending radius and excellent performance
- ✓Available in OS2 singlemode or OM2/OM3/OM4 multimode fiber types
- ✓LSZH jacket for safe indoor, riser, and plenum-adjacent routing
- ✓Core count from 1 to 48 fibers, ordered in 04, 06, 08… increments
- ✓Designed in the USA
Standard Compliance
- ISO/IEC 11801
- ITU-T G.651 / G.652 / G.655 / G.657
- IEC 60793-1
- IEC 60793-2
- IEC 60794-1
- IEC 60794-3
- IEC 60332-3
Every Indoor Tight Buffer Fiber Optic Cable from Heizka ships ready to splice, terminate, and patch into your existing fiber infrastructure.
Ordering Information
| Item # | Description |
|---|---|
| HEFITNXX0LZ | Indoor Tight Buffer Optical Fiber Cable, XX Core, OS2, LSZH |
| HEFITNXX2LZ | Indoor Tight Buffer Optical Fiber Cable, XX Core, OM2, LSZH |
| HEFITNXX3LZ | Indoor Tight Buffer Optical Fiber Cable, XX Core, OM3, LSZH |
| HEFITNXX4LZ | Indoor Tight Buffer Optical Fiber Cable, XX Core, OM4, LSZH |
Note: XX = Core Order (04, 06, 08…)
Technical Specifications
Construction
| Fiber type | G.652D / OM2 / OM3 / OM4 |
| Fiber core | 1–48 |
| Tight buffered material | PVC |
| Tight buffered diameter | 0.9 mm |
| Strength member | Aramid yarn |
| Sheath material | LSZH |
Mechanical and Environmental Performance
| Tensile, long/short term (≤4 cores) | 70 / 220 N |
| Tensile, long/short term (≤12 cores) | 200 / 600 N |
| Crush, long/short term | 300 / 1000 N/100mm |
| Bend radius, static/dynamic | 10 / 20 × cable diameter |
| Installation temperature | -10°C ~ 70°C |
| Storage and operation temperature | -20°C ~ 70°C |
Optical Specifications
| Fiber type | Attenuation 850/1300nm or 1310/1550nm (dB/km) | 1GbE | 10GbE | 40GbE | 100GbE |
|---|---|---|---|---|---|
| OM2 | ≤3.0 / ≤0.8 | 550m | 82m | — | — |
| OM3 | ≤2.8 / ≤0.7 | — | 300m | 100m | 70m |
| OM4 | ≤2.8 / ≤0.7 | — | 550m | 150m | 150m |
| OS2 | ≤0.36 / ≤0.22 | 20km – 200km | |||
Indoor Tight Buffer vs Outdoor Loose Tube — Which One Do You Need?
| Feature | Indoor Tight Buffer (F1) | Outdoor Loose Tube Non-metallic (F2) | Outdoor Loose Tube Steel Tape (F3) |
|---|---|---|---|
| Item # (OM3) | HEFITNXX3LZ | HEFOLNXX3PE | HEFOLSXX3PE |
| Fiber core range | 1–48 | 2–144 | 2–12 |
| Strength member | Aramid yarn (all-dielectric) | FRP (all-dielectric) | Two parallel steel wires + corrugated steel tape |
| Sheath | LSZH | PE | PE + corrugated steel tape |
| Tensile, long/short term | 70–200 / 220–600 N | 600 / 1500 N | 600 / 1500 N |
| Operating temperature | -20°C ~ 70°C | -30°C ~ 70°C | -40°C ~ 70°C |
| Best for | Indoor LAN backbone, data center cross-connect, FTTD | Outdoor aerial or duct backbone runs | Long-haul outdoor/direct-burial runs needing rodent & crush protection |
Frequently Asked Questions
The 61 Series Indoor Tight Buffer cable is available in singlemode OS2 or multimode OM2, OM3, and OM4 fiber, covering everything from short data-center links to long campus backbone runs.
No. This is an indoor-rated, tight-buffered cable with an LSZH jacket. For outdoor runs, choose Heizka’s Outdoor Stranded Loose Tube Non-metallic or Steel Tape Armor fiber cables, which are rated for UV exposure and wider temperature ranges.
OM3 and OM4 are multimode fibers optimized for shorter, high-bandwidth links (up to 550m at 10GbE for OM4); OS2 is singlemode fiber built for long-haul links up to 200km. Choose multimode for data center and LAN runs, and singlemode for campus or long-distance backbone links.
Because the cable contains no metallic elements, it is immune to electromagnetic interference and safe to route in the same pathway as power cabling, while the aramid yarn still delivers strong tensile performance during pulling and installation.
Core counts run from 1 to 48 fibers, ordered in 04, 06, 08… increments to match your splicing and patch panel requirements.
Heizka Cable — Designed in the USA, distributed in 20+ countries worldwide.
