Description
The DDS GYXTW-SM is an outdoor armored single-mode fiber optic cable designed for reliable optical communication in telecommunications, FTTH/FTTx, CCTV, LAN, access and outdoor backbone networks.
The cable uses a central gel-filled PBT loose tube containing the optical fibers. A corrugated steel tape armor provides mechanical and rodent protection, while two parallel steel wires provide additional tensile strength. The entire construction is protected by a UV-resistant black PE/MDPE outer jacket.
The central loose-tube construction provides a compact and lightweight cable design while maintaining good mechanical and environmental performance.
Cable Construction
The DDS GYXTW-SM cable consists of the following layers:
1. Optical Fibers
Single-mode G.652D optical fibers provide high-performance optical transmission.
2. Central Loose Tube
A hydrolysis-resistant PBT loose tube contains the optical fibers and is filled with thixotropic water-blocking gel.
3. Water Blocking
The filling compound prevents longitudinal water penetration and protects the optical fibers against moisture.
4. Corrugated Steel Tape Armor
A corrugated steel tape layer provides additional mechanical protection and improved resistance against crushing, impact and rodents.
5. Parallel Steel Wires
Two parallel steel wires positioned on opposite sides of the cable provide tensile reinforcement.
6. Outer Jacket
A black UV-resistant PE/MDPE outer sheath protects the cable against outdoor environmental conditions.
This construction is characteristic of GYXTW cables.
Structural Specification
| Parameter | Specification |
|---|---|
| Cable Designation | GYXTW |
| Cable Structure | Central Loose Tube |
| Fiber Type | Single Mode |
| Fiber Standard | ITU-T G.652D |
| Loose Tube Material | PBT |
| Loose Tube Filling | Thixotropic Water-Blocking Gel |
| Armor | Corrugated Steel Tape |
| Strength Member | 2 × Parallel Steel Wires |
| Water Blocking | Filling Gel / Water-Blocking Layer |
| Outer Sheath Material | PE / MDPE |
| Outer Sheath Color | Black |
| UV Resistance | Yes |
| Installation | Outdoor |
| Maximum Fibers per Tube | Up to 24 |
| Maximum Loose Tubes | 1 |
The single central tube and two steel wires are key characteristics of GYXTW.
Optical Fiber Specifications
Single Mode G.652D – OS2
| Parameter | Specification |
|---|---|
| Fiber Type | Single Mode |
| Standard | ITU-T G.652D |
| Fiber Core / Cladding | 9/125 µm |
| Coating Diameter | 245–250 µm |
| Maximum Attenuation @1310 nm | ≤ 0.36 dB/km |
| Maximum Attenuation @1550 nm | ≤ 0.22 dB/km |
| Maximum Attenuation @1625 nm | Typically ≤ 0.23 dB/km |
| Operating Wavelength | 1310 / 1550 nm |
| Cable Cut-Off Wavelength | ≤ 1260 nm |
| Mode Field Diameter @1310 nm | Typically 9.0–9.5 µm |
| Mode Field Diameter @1550 nm | Typically 10.0–10.5 µm |
Published GYXTW specifications commonly use G.652D fiber with attenuation of approximately ≤0.36 dB/km at 1310 nm and ≤0.22 dB/km at 1550 nm.
Fiber Color Identification
The standard 12-color sequence can be used for fiber identification:
| Fiber No. | Color |
|---|---|
| 1 | Blue |
| 2 | Orange |
| 3 | Green |
| 4 | Brown |
| 5 | Slate / Gray |
| 6 | White |
| 7 | Red |
| 8 | Black |
| 9 | Yellow |
| 10 | Violet |
| 11 | Rose / Pink |
| 12 | Aqua |
For 4-, 8- and 12-core versions, the corresponding number of fibers is used. For the 24-core version, identification is normally achieved using a second identification sequence/marking system as specified by the manufacturer.
Mechanical Specifications
| Parameter | 4 Core | 8 Core | 12 Core | 24 Core |
|---|---|---|---|---|
| Typical Cable OD | ~7.7–8.5 mm | ~7.9–8.5 mm | ~8.5–9.0 mm | ~8.5–11.2 mm |
| Short-Term Tensile | 1500 N | 1500 N | 1500 N | 1500 N |
| Long-Term Tensile | 600 N | 600 N | 600 N | 600 N |
| Short-Term Crush | 1000 N/100 mm | 1000 N/100 mm | 1000 N/100 mm | 1000 N/100 mm |
| Long-Term Crush | 300 N/100 mm | 300 N/100 mm | 300 N/100 mm | 300 N/100 mm |
| Static Bending Radius | ≥10 × OD | ≥10 × OD | ≥10 × OD | ≥10 × OD |
| Dynamic Bending Radius | ≥20 × OD | ≥20 × OD | ≥20 × OD | ≥20 × OD |
Actual cable diameter varies according to the loose-tube diameter, steel tape thickness, steel-wire diameter and jacket design. Published GYXTW constructions show approximately 7.7–8.5 mm for 4/8 cores and approximately 8.5–9.0 mm or higher for 12/24 cores.
Typical Cable Dimensions
For a DDS product catalogue, I recommend using the following nominal ranges rather than presenting an unnecessarily precise dimension before the factory production drawing is finalized:
| Part Number | Fiber Count | Typical OD Range |
|---|---|---|
| DFC-GYXTW-SM-4C | 4 | 7.7–8.5 mm |
| DFC-GYXTW-SM-8C | 8 | 7.9–8.5 mm |
| DFC-GYXTW-SM-12C | 12 | 8.5–9.0 mm |
| DFC-GYXTW-SM-24C | 24 | 9.0–11.2 mm |
Different GYXTW manufacturers use different tube and jacket dimensions, so the final DDS value should be taken from the actual production specification.
Typical Cable Weight
| Fiber Count | Typical Weight Range |
|---|---|
| 4 Core | ~57–80 kg/km |
| 8 Core | ~59–90 kg/km |
| 12 Core | ~65–105 kg/km |
| 24 Core | ~80–130 kg/km |
Cable weight depends on the steel tape, steel-wire dimensions and jacket thickness. Published GYXTW examples range from approximately 63 kg/km to 95 kg/km depending on construction, while other armored designs are heavier.
Tensile and Crush Performance
Tensile Strength
Short-Term: 1500 N
Long-Term: 600 N
Crush Resistance
Short-Term: 1000 N/100 mm
Long-Term: 300 N/100 mm
These are widely specified values for GYXTW cable constructions.
Bending Radius
| Condition | Minimum Bending Radius |
|---|---|
| Static / Without Tension | ≥10 × Cable OD |
| Dynamic / Under Installation | ≥20 × Cable OD |
For example, for a 10 mm cable:
- Static: ≥100 mm
- Dynamic: ≥200 mm
Published GYXTW specifications commonly specify 10×OD static and 20×OD dynamic bending radii.
Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | -40°C to +70°C |
| Installation Temperature | -20°C to +60°C |
| Storage / Transport | -40°C to +70°C |
| Outer Sheath | UV-Resistant PE/MDPE |
| Water Resistance | Yes |
| Moisture Protection | Yes |
| Rodent Protection | Enhanced by steel armor |
| Outdoor Application | Yes |
These temperature ranges are consistent with published GYXTW products.
Recommended Applications
The DDS GYXTW-SM series is suitable for:
- Outdoor telecommunications networks
- FTTH / FTTx networks
- ISP access networks
- CCTV networks
- Security systems
- Campus networks
- Industrial networks
- LAN backbone connections
- Data communication networks
- Outdoor building-to-building links
- Duct installations
- Aerial installations
- Access network distribution
- Outdoor fiber backbone applications
GYXTW cables are commonly specified for duct and aerial installation.
Key Features
- Single Mode G.652D fiber
- Central loose tube construction
- Corrugated steel tape armor
- Two parallel steel wire strength members
- Gel-filled PBT loose tube
- Excellent moisture protection
- Good crush resistance
- Enhanced rodent protection
- High tensile strength
- UV-resistant black PE/MDPE jacket
- Compact and lightweight design
- Suitable for outdoor applications
- Suitable for duct and aerial installation
- Available in 4, 8, 12 and 24 cores
Standards & Compliance
The cable may be manufactured and tested in accordance with applicable requirements of:
- ITU-T G.652D – Characteristics of a single-mode optical fibre and cable
- IEC 60794-1 – Optical fibre cables – Generic specification
- IEC 60794-2 – Outdoor optical fibre cables, where applicable
- Applicable RoHS requirements
- Applicable national/local telecommunications cable requirements
Published GYXTW products reference IEC 60794-1 and relevant national/industry standards.
Cable Marking
Typical outer sheath marking can be specified as:
DDS GYXTW-SM-XXC G.652D [YEAR] [METER MARKING]
Example:
DDS GYXTW-SM-24C G.652D 2026 0001M
The actual marking format can be customized according to DDS requirements.
Ordering Information
| Part Number | Description |
|---|---|
| DFC-GYXTW-SM-4C | DDS 4 Core Outdoor Single Mode GYXTW Armored Fiber Optic Cable |
| DFC-GYXTW-SM-8C | DDS 8 Core Outdoor Single Mode GYXTW Armored Fiber Optic Cable |
| DFC-GYXTW-SM-12C | DDS 12 Core Outdoor Single Mode GYXTW Armored Fiber Optic Cable |
| DFC-GYXTW-SM-24C | DDS 24 Core Outdoor Single Mode GYXTW Armored Fiber Optic Cable |
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