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Structure of Central Tube Cable

Optical fiber
Optical gel: The optical gel is filled in optical cables before they are completed and are coated with sheaths to pass waterproof tests and infiltration tests.
The buffer tuber is a kind of the thermoplastic material and is made of polypropylene can nylon. The buffer tuber can be put in fiber cable loosely and protect optical fiber from interior stress and outer side pressure.
The strength member: two parallel phosphatized steel wire.
The water proofing material: water blocking filling compound
Armored layer: steel-plastics tape
The outer jacket uses black polyethylene and is easy to lay and transport.

Description of Central Tube Cable

We insert a single-mode or multi-mode cable into a loose tube made of high modulus polyester material and filled with water proof compounds. The external of loose tube is vertical wrapped double chromium-plated plastic steel tape. Water blocking material is added between the steel belt and loose tube to ensure the compact and vertical water blocking of the cable. Extruded polyethylene sheath into cable with two parallel wires placed on both sides.

Application of Central Tube Cable

The central tube cable is suitable for Long distance and interoffice communication.

Parameter

1. Parameter of optical fiber

		G.652.D	G.655	50/125μm	62.5/125μm
Attenuation	@850nm	-	-	≤3.0dB/km	≤3.0dB/km
	@1300nm	-	-	≤1.0dB/km	≤1.0dB/km
	@1310nm	≤0.36dB/km	≤0.36dB/km	-	-
	@1550nm	≤0.22dB/km	≤0.23dB/km	-	-
Band width	@850nm	-	-	≥500MHz·km	≥200MHz·km
Band width	@1300nm	-	-	≥1000MHz·km	≥600MHz·km
Fiber cutoff wavelength		≤1260nm	≤1260nm	-	-
Polarization Mode Dispersion	Single optical fiber	≤0.20ps/√km	≤0.20ps/√km	-	-
Link value (M=20，Q=0.01%)		≤0.10ps/√km	≤0.10ps/√km	-	-

2. Technical parameter

Item	Item	Value
	Number of cable cores	6	12		24	36	48
Loose tube	Outer diameter	2.6	2.8		2.8	3.2	3.6
	Number of Loose Tube* number of cores per tube	1*6	1*12		1*24	1*36	1*48
Reference outer diameter	mm	8.5	8.5		9.0	9.0	9.0
Central strength member	Material	Steel wire
	Diameter(mm)	1.0		1.2
Water blocking material	Material	Water blocking cable gel
Armored layer	Material	Corrugated steel belt
Outer sheath	Thickness(±0.2mm)	1.8
Range of operating temperature	℃	-40- +70
Pull	Short-term /long-term(N)	1500/600
Flatten		3000/1000
*According to customer's requirements, the stranded loose tube armored cable can customize other structures or cores.

3. Main machinery and environment performance

Item	Inspection standard	Specified value	Requirements
Pull	IEC 60794-1-2-E1	According to technical parameter	Additional attenuation for short term≤0.1dB
Flatten	IEC 60794-1-2-E3	According to technical parameter	Additional attenuation for short term≤0.1dB
Impact	IEC 60794-1-2-E4	The height is 1 meter punch hammer 450g at least 50 times	Residual additional attenuation:≤0.03dB
Backward and forward bending	IEC 60794-1-2-E6	Loading 150N 30times	Residual additional attenuation:≤0.03dB
Twisting	IEC 60794-1-2-E7	1 meter ±180° 10 times	Residual additional attenuation:≤0.03dB
Temperature recycle test	IEC 60794-1-2-F1	-40℃ +70℃	Change of additional attenuation:≤0.05dB/km
* The monitoring of all optical fiber attenuation's change is operated in wavelength of 1550nm.

Features

The accurate control of the optical fiber's surplus length ensure the good machinery performance and temperature characteristics.
The loose tube has good hydrolysis - resistant performance and high strength. The tube is filled with special ointment to make key protection for optical fiber.
The compact optical cable structure with special design can place contraction of tube effectively.
The good performance of press and softness.
The double chromium-plated plastic steel tape can improve the cable's moisture resistance capacity.
Two parallel steel wires ensure the tensile strength of cable.
The polyethylene sheath has good anti-ultraviolet radiation performance. And the polyethylene sheath has small diameter, light weight and is easy to install.

Standards

YD/T 769-2010 central tube outdoor cable for telecommunication
IEC 60794-1-1-2011 Cable section 1-1

Installation

Duct, Aerial, Direct burial