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Equipment

Type content, code and means  
    Type is made up of model and specification, as following 
        
   Cable mode code consist of five parts, which are listed bellow. Each part is represented by symbols.

         

 

 


Symbols for classification
    GY------------------ optical fiber telecommunication cables for outdoor.

Strength member code 
  Strength member used for strength tensile sheath or inset sheath
   (non)--------Metallic strength member       
   F------------------ FNon-metallic strength member

Cable core and optical cable derive structure character code 
    Optical cable structure character shall reflect main type and derive structure of cable core. it is shared code when there are several structure character need mark. It is compound code arrange from up to down according to code below.

D optical fiber ribbon structure

(Non) loose tube stranding structure

J tight buffered fiber structure

(Non) Tier twist structure

X central tube structure

T filled compound

(Non) dry type water-resistance structure

R charge structure

C self-supporting structure

B compressed structure

E ellipse structure

Z flame-retardant structure

Symbols for sheath 

Y polyethylene sheath

V PVC sheath

U polyurethane jacket

A aluminum-polyethylene clung structure

S steel-polyethylene clung structure

W steel polyethylene clung sheath with steel wires inside

L aluminum sheath

G steel sheath

Q lead sheath

 

TABLE 1   Armor layer

Code

 Armor  layer

0

Non-armor layer

2

wrapping double steel tape

3

single thin steel wire

33

Double thin steel wire

4

single thick steel wire

44

double thick steel wire

5

Corrugated steel tape

Symbols for Outer sheath 
    It can include mat layer, armor layer and muter coating when there is outer coating, It is code show for two group number(mat layer need not)first group is armor layer, it is can one or two number, see table 1,second group is outer coating or sheath It is one number see table 2.

Table 2  Outer coating or sheath

code

Outer coating or sheath

1

Fiber coating

2

PVC sheath

3

PE sheath

4

PE +nylon sheath

5

PE protect sheath

Symbols for cable specification
    Coble specification is made up of fire and conduct core.

Symbols for fiber count
   Represented by the figure of valid fiber number of the same category.

Symbols for fiber classification 
   Fiber classification is represented by symbols for fiber type. Uppercase A represented Multi mode optical fiber, uppercase B represented single mode optical fiber, numeral and lowercase represented various classifications for single or multi mode fiber, common symbols as follows.      

Table 3 

type code

character

Fiber core dia.
m

cladding diameter
m

Material

Ala

Grade-index multimode fiber 

50

125um

SiO2

Alb

Grade-index multimode fiber

62.5

125um

SiO2

Alc

Grade-index multimode fiber

85

125um

SiO2

 


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