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YD/T 908-2020 English PDF (YDT908-2020)

YD/T 908-2020 English PDF (YDT908-2020)

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YD/T 908-2020: Naming rules for type of optical fibre cables

This Standard specifies the model naming rules for communication optical fibre cables. This Standard applies to the model naming of communication optical fibre cables.
YD/T 908-2020
YD
COMMUNICATION INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 33.180.10
M 33
Replacing YD/T 908-2011
The naming rules for type of optical fibre cables
ISSUED ON: APRIL 16, 2020
IMPLEMENTED ON: JULY 01, 2020
Issued by: Ministry of Industry and Information Technology of P. R. China Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Model composition ... 6
3.1 Content of model composition ... 6
3.2 Format of model composition ... 6
4 Composition, code and meaning of model ... 7
4.1 Basic types of optical fibre cables ... 7
4.2 Basic specifications of optical fibre cables ... 15
4.3 Types and specifications of composite optical fibre cables ... 16
4.4 Special properties identification ... 18
5 Examples ... 18
Annex A (informative) Classification codes of multimode fibers ... 20
Annex B (informative) Classification codes of single-mode fibers ... 21 Annex C (informative) Examples of typical cable type variations ... 22
The naming rules for type of optical fibre cables
1 Scope
This Standard specifies the model naming rules for communication optical fibre cables. This Standard applies to the model naming of communication optical fibre cables. 2 Normative references
The provisions in the following documents become part of this Standard, through reference in this Standard. For the dated documents, only the versions with the dates indicated are applicable to this Standard; for the undated documents, only the latest version (including all the amendments) is applicable to this Standard.
GB/T 9771 (all parts), Single-mode optical fibres for telecommunication GB/T 12357 (all parts), Multimode optical fibres for telecommunication
3 Model composition
3.1 Content of model composition
The model consists of three parts: type, specification and special performance mark (default).
3.2 Format of model composition
The format of the model composition is shown in Figure 1. There shall be a space between the type code and specification code. The "-" link is used between the specification code and the special performance mark (default) code.
NOTE: For optical fibre cables used in other industries not covered by this Standard, appropriate codes can be added before the corresponding classification codes to indicate. For example, The code of the communication optical fibre cable for coal mine is MG.
4.1.2.2 Outdoor optical fibre cables
The classification codes of outdoor optical fibre cables have the following meanings. - GY: indoor (field) optical fibre cable for communication;
- GYC: air-blown miniature outdoor optical fiber cable for communication; - GYL: laying optical fibre cables in micro-grooves on the outdoor pavement for communication;
- GYP: outdoor rodent-proof drainage pipe optical fibre cable for communication; - GYQ: light outdoor optical fibre cable for communication.
4.1.2.3 Indoor optical fibre cables
The classification codes of indoor optical fibre cables have the following meanings. - GJ: indoor (bureau) optical fibre cable for communication;
- GJA: indoor optical fibre cable for terminal assemblies for communication; - GJC: air-blown miniature indoor optical fibre cable for communication; - GJB: indoor branch optical fibre cable for communication;
- GJP: indoor distribution optical fibre cable for communication;
- GJI: optical fibre cable for interconnection of indoor equipment for communication; - GJH: invisible optical fibre cable;
- GJR: indoor circular drop optical fibre cable for communication;
- GJX: indoor butterfly drop optical fibre cable for communication.
4.1.2.4 Indoor-outdoor optical fibre cables
The classification codes of indoor-outdoor optical fibre cables have the following meanings.
- GJY: indoor-outdoor optical fibre cables for communication;
- GJYR: indoor-outdoor circular lead-in optical fibre cable for communication; - GJYX: indoor-outdoor butterfly optical fibre cable for communication; - GJYQ: light indoor-outdoor optical fibre cable for communication.
4.1.2.5 Other types
The meanings of the classification codes of other types of optical fibre cables are as follows.
- GH: submarine optical fibre cable for communication;
- GM: mobile optical fibre cable for communication;
- GS: optical fibre cable for communication equipment;
- GT: special optical fibre cable for communication;
- GD: optical hybrid cable for communication;
- GDJ: indoor optical hybrid cable for communication.
NOTE: GD defaults to the outdoor optical hybrid cable for communication. It is also applicable to the indoor-outdoor optical hybrid cable for communication.
4.1.3 Codes and meanings of strength members
The strength member refers to the member inside the jacket or embedded in the jacket for the tensile force of the optical fibre cable, including cable core internal strength member, cable core external strength member, jacket embedded strength member, and so on.
When the following codes cannot accurately express the characteristics of the strength member of the optical fibre cable, new characters shall be added to facilitate the expression. New characters shall conform to the following rules:
- Prefer to use a capitalized pinyin letter;
- The characters used shall not repeat the characters listed below;
- The pinyin or English initials of words related to the new component characteristics shall be used as much as possible.
The codes and meanings of the strength members are as follows.
- (Unsigned): metal strength member;
- F: non-metallic strength member;
- N: without strength member.
NOTE: The strength member code only represents a strength member closest to the center of the cable core.
4.1.4 Codes and meanings of the derived structural characteristics of the cable core and optical fibre cable
4.1.4.1 General
The structural characteristics of the optical fibre cable shall indicate the main structural type of the cable core and the derived structure of the optical fibre cable. When the optical fibre cable type has several structural characteristics that need to be indicated, it can be indicated by a combined code. The combined codes are arranged in the order from top to bottom of the following corresponding codes.
When the following codes cannot accurately express the cable core structure and derived structural characteristics of the optical fibre cable, new characters shall be added at the corresponding positions to facilitate expression. The new characters added shall meet the following requirements:
- Prefer to use a capital phonetic letter or Arabic numerals;
- The characters used shall not repeat the characters listed below;
- Use the pinyin or English initials of words related to the new structural characteristics as much as possible.
4.1.4.2 Organization mode for optical fiber
The codes and meanings of organization mode for optical fiber are as follows. - (Unsigned): separate type;
- D: fiber optic strip type;
- S: solid optical fiber bundle type.
NOTE: The solid optical fiber bundle type refers to a bundled optical fiber distribution structure with a fixed relative position after solidification.
4.1.4.3 Secondary coating structure
The codes and meanings of the secondary coating structure are as follows. - (Unsigned): plastic loose sleeve coating structure;
- M: metal loose sleeve coating structure;
- E: without coating structure;
- 7: non-metallic strip;
- 8: non-metallic rod;
- 88: double-layer non-metallic rod.
4.1.4.7 Load bearing structure
The codes and meanings of the bearing structures are as follows.
- (Unsigned): non-self-bearing structure;
- C: self-bearing structure.
4.1.4.8 Suspension wire material
The codes and meanings of suspension wire materials are as follows.
- (Unsigned): metal reinforced suspension wire or no suspension wire;
- F: non-metallic reinforced suspension wire.
4.1.4.9 Cross-sectional shape
The codes and meanings of the cross-sectional shapes are as follows.
- (Unsigned): round;
- 8: "8" shape;
- B: flat shape;
- E: oval shape.
For those whose cross-sectional shape has been reflected in the classification code, such as GJR, GJX, GJYR, GJYX, the codes specified in this article are not applicable. 4.1.5 Code and meaning of jacket
4.1.5.1 General
The code of the jacket shall indicate the structure and material characteristics of the jacket. When the jacket has several characteristics that need to be indicated, it can be indicated by a combined code. The combined codes are arranged in the order from top to bottom of the following corresponding codes.
When the following codes cannot accurately express the jacket characteristics of the optical fibre cable, new characters shall be added to facilitate the expression. The new characters added shall comply with the following rules:
- Prefer to use a capitalized pinyin letter;
- The characters used shall not repeat the characters listed below;
- Whenever possible, use the pinyin or English initials of words related to the new jacket characteristics.
4.1.5.2 Flame retardant properties of jacket
The codes and meanings of the flame retardant properties of the jacket are as follows. - (Unsigned): jacket of non-flame retardant material;
- Z: jacket of flame retardant material.
NOTE 1: V, U and H jackets have flame retardant properties, and Z is omitted. NOTE 2: Z here only means that the jacket material is flame retardant. The flame retardant properties of the cables are shown in Table 3.
4.1.5.3 Jacket structure
The codes and meanings of the jacket structure are as follows.
- (Unsigned): single-material jacket;
- A: aluminum-plastic bonded jacket;
- S: steel-plastic bonded jacket;
- W: steel-plastic bonded jacket with parallel strength member;
- P: plastic jacket with parallel strength member;
- K: spiral steel pipe-plastic jacket.
4.1.5.4 Jacket material
The codes and meanings of jacket materials are as follows.
- (Unsigned): when combined with the jacket structure code, it means polyethylene jacket;
- Y: polyethylene jacket;
- V: PVC jacket;
- H: low-smoke halogen-free jacket;
- U: polyurethane jacket;
4.3 Types and specifications of composite optical fibre cables
4.3.1 Type specifications of composite optical fibre cables composed of multiple optical fibre cable subunits
4.3.1.1 Composition and format of type specifications
The composite optical fibre cable composed of multiple optical fibre cable sub-units is shown in Figure 3 in terms of its type and specification. Of which, n1, n2... represent the number of subunits.
Figure 3 -- Type and specification for composite optical fibre cable composed of multiple optical fibre cable subunits
NOTE: Specifications can be expressed in parentheses when required.
4.3.1.2 Main cable type code
The type code of the main cable consists of classification code, strength member code, cable core structure code, water resistance structure code, cable core outer jacket inner strength layer code, load-bearing structure code, suspension wire material code, cross- sectional shape code, jacket code and outer jacket code.
For each code and its meaning, see the relevant regulations in 4.1.
4.3.1.3 Type specification of optical fibre cable subunit
The type specification of each optical fibre cable subunit can be named according to the provisions of 4.1 and 4.2. Multi-level nesting can be carried out according to the requirements of this section. It can be omitted when the classification code of the subunit is the same as that of the main cable.
4.3.2 Type specification of composite optical fibre cable composed of optical unit and electrical unit
4.3.2.1 Composition and format of type specification
The composite optical fibre cable composed of optical subunit and electrical subunit is shown in Figure 4 in terms of its type and specification. Of which, n1, n2... represent the number of subunits.
Main cable type code n1??(subunit type specification 1) + n2??(subunit type specification 2) + ... Figure 4 -- Type specification of composite optical fibre cable composed of optical unit and electrical unit
NOTE: Specifications can be expressed in parentheses when required.
4.3.2.2 Main cable type code
The main cable type code consists of classification code, strength member code, cable core structure code, water resistance structure code, cable core external strength layer code, bearing structure code, suspension wire material code, cross-sectional shape code, jacket code, outer jacket code and main cable shielding code.
The shielding code of the main cable is as follows. For other codes and their meanings, see the relevant regulations in 4.1.
- (Unsigned): without main cable shielding;
- P: with main cable shielding.
4.3.2.3 Type specification of subunit
4.3.2.3.1 Composition and format of type specification
The type and specification of subunits are expressed in the order of optical subunit, coaxial cable subunit, symmetrical cable subunit and feeder line subunit. 4.3.2.3.2 Type specification of optical subunit
When the optical subunit has a jacket, the naming mode of its type and specification shall be carried out in accordance with the provisions in 4.1 and 4.2. Multi-level nesting can be carried out according to the requirements of this section. When the optical subunit has no jacket, the type can be omitted. The naming mode of specifications shall be in accordance with the regulations in 4.2.
4.3.2.3.3 Type specification of coaxial cable subunit
The naming mode of the type and specification of the coaxial cable subunit refers to the relevant standards of the coaxial cable. The details are stipulated by the product standard.
4.3.2.3.4 Type specification for symmetrical cable subunit
The naming mode of the type and specification of the symmetrical cable subunit refers to the relevant standards of the symmetrical cable. The details are stipulated by the product standard.
Main cable type code n1??(subunit type specification 1) + n2??(subunit type specification 2) + ... metallic strength member, fiber optic with skeleton fully dry, polyethylene jacket, non- metal wire armor, polyethylene jacket, including 144 pieces of B1.3 single-mode fibers, shall be represented as:
GYFDGY63 144B1.3.
Example 3: The model for the outdoor optical fibre cable for communication with metal strength member, loose sleeve layer twisted filling type, aluminum-polyethylene bonded jacket, including 12 pieces of B1.3 single-mode optical fibers and 6 pieces of B4 single-mode optical fibers, shall be represented as:
GYTA 12B1.3+6B4.
Example 4: The model for cluster cables for non-metallic strength member, low-smoke, halogen-free and flame-retardant polyolefin outer jacket, terminal assembly, including 6 pieces of 8-core tight-sleeved optical fiber PVC jacketed sub-cables, the optical fiber type is A1a.1 multimode optical fiber, shall be represented as:
GJAFH-J 6X (FJV 8A1a.1).
Example 5: The model for the outdoor fire-resistant optical fiber cable for communication of metal strength member, loose sleeve layer twisted filling type, steel- flame retardant polyethylene adhesive jacket, including 12 pieces of B1.3 single-mode optical fibers, without failure under the "one"-shaped fire-resistant 750??C flame test for 90min and 15min after extinguishing the flame, with low-smoke and halogen-free characteristics and bundled flame-retardant class C characteristics, shall be represented as:
GYTZS 12B1.3 WDZCN1-750 (90+15).
Example 6: The model for the indoor optical hybrid cable for communication, PVC jacket, including two pieces of single-core B6a2 optical fiber low-smoke halogen-free jacketed butterfly cables, and two RV-type feeder lines with a nominal cross-sectional area of 1.5mm2, bundled into a flame-retardant class C, shall be represented as: GDJV [2??(GJXH 1B6a2)+2??(RV 1.5)] ZC
See Annex C for examples of typical cable type variations.

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