Simplex Round Indoor Cable
GJFJH(V)
1-Optical fiber
2-Tight buffer
3-Strength member
4-Sheath
Product features
Small bending radius,Compact structure and light weight
Low procurement and construction costs, convenient connection
Good flexibility, suitable for making patch cord and pigtail
Flame retardant LSZH sheath meets relevant fire protection requirements with indoor environment
Applications
Used in indoor cabling,Pigtail and patch cord in communication equipments
Fiber Transmission Performance
|
Cabled Optical fiber |
62.5um (850nm/1300nm) |
50um (850nm/1300nm) |
G.652 (1310nm/1550nm) |
G.657 (1310nm/1550nm) |
|
Max attenuation(dB/km) |
3.5/1.5 |
3.5/1.5 |
0.4/0.3 |
0.4/0.3 |
|
Typical value(dB/km) |
3.0/1.0 |
3.0/1.0 |
0.36/0.22 |
0.36/0.22 |
Technical Specification
|
Cable type |
Fiber counts |
Tensile force (N) |
Flattening force (N/100mm) |
Minimum bending radius (mm) |
Optical cable diameter (mm) |
|||
|
short term |
Long term |
short term |
Long term |
When installing |
After installation |
|||
|
GJFJH(V) |
1 |
60 |
30 |
500 |
200 |
20D |
10D |
1.6 |
|
GJFJH(V) |
1 |
60 |
30 |
500 |
200 |
20D |
10D |
1.8 |
|
GJFJH(V) |
1 |
60 |
30 |
500 |
200 |
20D |
10D |
2.0 |
|
GJFJH(V) |
1 |
120 |
60 |
500 |
200 |
20D |
10D |
2.5 |
|
GJFJH(V) |
1 |
120 |
60 |
500 |
200 |
20D |
10D |
3.0 |
Note
1. D denotes the diameter of the cable; 2. The above parameters are typical value; 3. The cable spec. can be designed according to customer's requirement;
Environmental Characteristic
• Transport/storage temperature: -20℃ to +70℃
Cable Packing
• Standard length:1,000m or 2,000m; other lengths are also available.
• The cables are packed in wooden drums,or follow customer requirements.
Transportation
• Usually the shipping method is ship, if you need other shipping methods, please contact us
Service
• We can guarantee that the production will be carried out according to your requirements, and you can contact us at any time if you have any questions or quality problems, and we will give you a satisfactory reply and treatment.
Partner
Fiber Simplex Indoor Cable – Structure, Applications and Selection Guide
What Is a Fiber Simplex Indoor Cable?
Fiber Simplex Indoor Cable Definition
A fiber simplex indoor cable is a single-core indoor optical cable designed for use inside buildings. "Simplex" means there is only one optical fiber in the cable, so each cable provides one transmission path. In Hengtong Global's product system, this type of cable typically follows the GJFJH structure – tight-buffered fiber, aramid yarn strength member and a flame-retardant indoor sheath.
Compared with a duplex indoor cable, which contains two fibers for transmit and receive in parallel, a fiber simplex indoor cable is more compact and lighter. It is ideal when you only need one fiber per route, such as for pigtails, device tails or simple point-to-point links.
Flame-Retardant Indoor Jacket for Safe Building Use
Compact Diameter and Tight Bending Radius for Easy Routing
Optimized for Indoor Handling, Stripping and Termination
Where Fiber Simplex Indoor Cable Fits in FTTX & LAN?
FTTH / FTTX networks
In FTTH / FTTX networks, a fiber simplex indoor cable is typically used in the indoor drop section, for example:
From the corridor or floor fiber distribution box to the customer terminal box or wall outlet.
As a pigtail or device tail between the indoor termination box and the ONT/ONU or other CPE.
Its small size and good flexibility make it easy to route along walls, ceilings or inside plastic trunking and conduits, helping operators finish the "last tens of meters" of the FTTX link inside apartments, offices and shops.
enterprise LANs and data centers
In enterprise LANs and data centers, fiber simplex indoor cable is widely used as the base cable for patch cords and pigtails:
Factory-terminated with LC/SC/FC/ST connectors, it becomes a fiber simplex indoor patch cord between ODF/patch panels and active equipment (switches, OLTs, servers, routers).
As pigtails, short lengths of fiber simplex indoor cable are spliced to backbone or distribution cables in racks and cabinets, providing a flexible connector interface for fiber management.
Thanks to this versatility, the fiber simplex indoor cable acts as a key building block linking FTTX access, enterprise LAN and data center environments.
Structure & Materials of Fiber Simplex Indoor Cable
Layer-by-Layer Construction Overview
A fiber simplex indoor cable from Hengtong Global adopts a compact, tight-buffered GJFJH structure. Each layer is designed to protect the fiber and make indoor installation easier and safer:
Optical Fiber (single-mode / multimode)
At the center is a single optical fiber, available in both single-mode and multimode versions. The glass fiber provides low-loss transmission over typical FTTH, LAN and data center distances, while maintaining stable performance under normal indoor bending and handling.
Tight Buffer Layer
The bare fiber is covered with a tight buffer coating, forming a 0.6–0.9 mm buffered fiber (depending on design). This layer offers high bonding strength to the fiber, providing:
Extra protection against moisture and micro mechanical damage
Better resistance to micro-bending in dense routing
Easier stripping during connector termination and splicing
Strength Member – Aramid Yarn
Around the tight-buffered fiber, aramid yarn (Kevlar®-type) is used as the primary strength member. It:
Absorbs tensile forces during pulling and installation
Increases crush resistance when the cable is pressed in ducts or under other cables
Keeps the cable flexible and lightweight for easy indoor routing
Sheath – PVC / LSZH
The whole construction is completed with a flame-retardant outer sheath, typically PVC or LSZH:
Provides mechanical protection against abrasion and minor impacts
Ensures the cable meets indoor fire safety requirements
Offers a smooth, round profile that is easy to pull through conduits, trays and cabinets
This layer-by-layer design ensures that the fiber simplex indoor cable remains rugged enough for daily operation, yet flexible and compact for high-density indoor cabling.
Available Fiber Types
To match different network architectures and transmission distances, the fiber simplex indoor cable can be supplied with a full range of ITU-T compliant fiber types:
Single-Mode Options (SM)
G.652D:
Standard, low-water-peak single-mode fiber
Suitable for long-distance transmission and general-purpose FTTX, metro and backbone links
G.657A1 / G.657A2:
Bend-insensitive single-mode fibers designed for tight indoor routing
Ideal for FTTH drops, in-building risers, cabinets and high-density fiber management where small bending radii are required
Multimode Options (MM)
OM2 (50/125 μm):
Suitable for short-reach 1G/10G Ethernet links in buildings and small data rooms
OM3 (50/125 μm, laser-optimized):
Designed for 10G and shorter-distance 40G applications
Widely used in modern data centers and high-performance LANs
OM4 (50/125 μm, enhanced laser-optimized):
Supports longer-reach 10G/40G/100G links
Recommended for high-density, high-bandwidth data center environments
By selecting the right combination of single-mode or multimode fiber and cable construction, Hengtong Global's fiber simplex indoor cable can be tailored to support anything from FTTH access to high-speed data center interconnects.
Jacket Options and Flame Retardancy
The outer sheath of the fiber simplex indoor cable is available in different materials to satisfy building codes and installation environments:
PVC Jacket – Cost-Effective for General Indoor Use
Suitable for standard office buildings, factories, equipment rooms and other environments with basic fire-retardant requirements
Offers good flexibility and mechanical protection at a competitive cost
Easy to strip for termination and rework
LSZH Jacket – Enhanced Safety for Public and Critical Buildings
Low Smoke Zero Halogen (LSZH) compounds significantly reduce:
- Smoke generation during fire
- Emission of corrosive and toxic gases
Recommended for public buildings, such as:
- Airports, railway stations, metro systems
- Hospitals, schools, shopping malls
- Data centers and control rooms with high equipment density
Helps protect both people and sensitive electronic equipment in the event of a fire
Compliance with Flame-Retardant Standards
Depending on project and regional requirements, the jacket can be designed and manufactured to meet common international flame-retardant and safety standards, such as typical IEC/EN/UL fire tests and, where required, local building codes. Specific certificates and classifications (for example, certain IEC 60332/60754/61034, EN/CPR or UL categories) can be provided according to Hengtong Global's actual product certification portfolio and the target market.
By choosing between PVC and LSZH jackets and the appropriate compliance level, customers can ensure that their fiber simplex indoor cable not only delivers reliable optical performance, but also meets the fire safety and regulatory requirements of each building and country.
Key Features of Fiber Simplex Indoor Cable
Compact Design and Easy Handling
Fiber simplex indoor cable has a small, round and lightweight structure. It can be routed easily in conduits, trays and cabinets, with tight bending radius and low risk of fiber damage during installation.
Cost-Effective for Indoor FTTX Deployment
With a single-core, tight-buffered design, this cable offers low material and termination cost. It is ideal for large-volume FTTH indoor drops where a simple, reliable and economical solution is required.
Flexible for Patch Cord and Pigtail Assembly
The cable's tight buffer and flexible jacket make stripping and termination straightforward. It is widely used as the base cable for patch cords, pigtails and equipment tails with SC, LC, FC or ST connectors.
Flame-Retardant and Safe for Indoor Use
When supplied with an LSZH jacket, the cable generates low smoke and no halogen in case of fire. This improves safety for people and protects sensitive equipment in indoor environments.
Typical Applications of Fiber Simplex Indoor Cable
01
Indoor FTTH / FTTX Cabling
Used as the indoor drop from floor distribution boxes or weak-current rooms to customer outlets or termination boxes, typically over the last 50–200 m of the FTTH link.
02
Patch Cords and Pigtails in Communication Equipment
Serves as the base cable for factory- or field-terminated patch cords between ODF/patch panels and switches, OLTs and routers, and for pigtails spliced inside termination boxes.
03
Building LAN and Vertical Distribution
Applied in building LANs and riser systems as equipment tails and short links between floor distribution boxes and network devices in wiring closets.
04
Industrial and Control Rooms
Used for single-fiber connections in control rooms, monitoring centers and industrial cabinets where good tensile and bending performance and EMI immunity are required.
Customization & OEM Service for Fiber Simplex Indoor Cable
Customizable Parameters
Customers can specify fiber type, cable diameter, jacket color, printing, reel length (e.g. 500 / 1000 / 2000 m / other) and packaging style (wooden drum, plastic reel, small coils) to match project and branding needs.
Compliance and Certificates
Cables can be supplied in accordance with relevant RoHS, REACH, ISO, CPR and other regional standards, with supporting certificates and test reports available on request.
Lead Time and Global Delivery
Standard designs allow competitive lead times and practical minimum order quantities, with global shipping options to support both project-based and long-term OEM business.
FAQ
Q: What is the typical bending radius of this fiber simplex indoor cable during installation and after installation?
A: A1: The bending radius is normally specified as 20D during installation and 10D in service, where D is the cable diameter.
Q: Can this fiber simplex indoor cable be terminated directly in the field?
A: A2: Yes. The tight-buffered design supports standard field termination with mechanical or splice-on connectors using common tools.
Q:Is LSZH jacket available for all diameters of fiber simplex indoor cable?
A: A3: LSZH options are available for the main diameters such as 2.0 mm and 3.0 mm, and can usually be provided for other sizes depending on product configuration.
Q: What is the recommended installation temperature range?
A: A4: A typical installation range is around -10°C to +60°C; exact limits depend on the specific cable design and should be checked in the datasheet.
Q: Can you supply pre-terminated fiber simplex indoor cable assemblies with SC/LC connectors?
A: A5: Yes. Pre-terminated assemblies with SC, LC, FC or ST connectors can be supplied in custom lengths and colors, with full factory testing.
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