23
TECHNICAL SPECIFICATION
OPTICAL FIBRE CABLE
LOOSE TUBE / JELLY FILLED
DOUBLE JACKET / SINGLE ARMORED
(LTD ARM CABLE) 23
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≤ 1.0 at 1300nm
≤ 3.5 at 850nm
≤ 1.0 at 1300nm
Bandwidth MHz.km
≥ 400 at 850nm
≥ 600 at 1300nm
≥ 200 at 850nm
≥ 400 at 1300nm
Numerical Aperture -
0.20±0.015 0.275±0.015
Core Diameter
µm
50±3.0 62.5±3.0
Core Non-circularity %
≤ 6.0 ≤ 6.0
Cladding Diameter
µm
125±2.0 125±2.0
Cladding Non-circularity %
≤ 2.0 ≤ 2.0
Core/Cladding Concentricity Error
µm
≤ 3.0 ≤ 3.0
Coating Diameter
µm
245±15 245±15
Proof Test Kpsi
≥ 100 ≥ 100
*Note) Superior performance available upon request.


µm
≤ 0.8
Cladding Diameter
µm
125±1.0
Cladding Non-circularity %
≤ 1.0
Coating Diameter
µm
245±15
Proof Test Kpsi
≥ 100
*Note) Superior performance available upon request. 3. CABLE CONSTRUCTION

The construction of the cable shall be in accordance with Table 3 below.

Table 3. Construction of the Cable
ITEMS DESCRIPTION
Type of Fiber Single Mode or 62.5 Multi Mode or 50 Multi Mode
Number of Fibers 2 ~ 72
No. of Fibers per Tube Max. 12
Material PBT (Polybutylene Terephthalate) Loose Buffer
Tube
Diameter Nom. 2.4mm
Filling Compound
in Loose Buffer Tube
Thixotropic Jelly Compound

Water Blocking Material
Water Swellable Tape
(To prevent the ingress of water)
Ripcord
Two Ripcords
(To provide easy cable entry, approx. 180° separation)
Material Steel Tape with Plastic Coating on Both Sides
Armor
Thickness
Nom. 0.15mm (Steel Tape)
Nom. 0.05mm (Plastic Coating)
Material Black HDPE or MDPE
Outer Jacket
Thickness Nom. 1.5mm, Min. 1.2mm

4. FIBER AND LOOSE BUFFER TUBE IDENTIFICATION

The color code of the loose buffer tubes and the individual fibers within each loose buffer
tube shall be in accordance with Table 4 below.

Table 4. The Color Code of the Individual Fibers and Loose Tubes
No. Color No. Color
1 Blue 7 Red
2 Orange 8 Black
3 Green 9 Yellow
4 Brown 10 Violet
5 Gray 11 Pink

for long term tensile load
Crush
# Test method: IEC 794-1 Method E3
-. Applied load: 3500N/100mm
-. Duration of loading: 1 minute
# Acceptance Criteria
-. Attenuation Increment: ≤ 0.10 dB (SM)
≤ 0.20 dB (MM)
after completion of the test
Impact
# Test method: IEC 794-1 Method E4
-. Drop hammer mass: 1 kg
-. Height of impact: 1 m
-. Diameter of drop hammer: 25 mm
-. Radius impact surface: 300 mm
-. No. of impact per point: 1 time
-. No. of impact points: 5 points (500mm interval)
# Acceptance Criteria
-. No jacket cracking and fiber breakage
-. Attenuation Increment: ≤ 0.10 dB (SM)
≤ 0.20 dB (MM)
after completion of the test
Repeated Bending
# Test method: IEC 794-1 Method E6
-. Sheave diameter: 20D (D = cable diameter)
-. No. of flexing cycles: 30 cycles
-. Flexing speed: 30 cycles/minute
# Acceptance Criteria
-. No jacket cracking and fiber breakage
-. Attenuation Increment: ≤ 0.10 dB (SM)