GB/T 50312-2016 PDF English
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Code for engineering acceptance of generic cabling system
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Code for engineering acceptance of generic cabling system
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Building and campus cabling system engineering Acceptance
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GB/T 50312-2016: Code for engineering acceptance of generic cabling system---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT50312-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB/T 50312-2016
Code for engineering acceptance of generic cabling system
Issued on: AUGUST 26, 2016
Implemented on: APRIL 01, 2017
Issued by. Ministry of Housing and Urban-Rural Development of PRC.
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Code for engineering acceptance of generic cabling system
Main drafting organization. Ministry of Industry and Information Technology of PRC
Approved by. Ministry of Housing and Urban-Rural Development of PRC
Effective date. April 1, 2017
China Planning Press
2016 Beijing
Table of Contents
Foreword... 5
1 General provisions... 7
2 Abbreviation... 7
3 Environment examination... 8
4 Examination of equipment and test instrumentation... 10
5 Examination of equipment installation... 13
6 Examination of cable laying and protective measures... 15
6.1 Cable laying... 15
6.2 Protective measures... 19
7 Cable termination... 22
8 Engineering electrical testing... 25
9 Management system acceptance... 28
10 Engineering acceptance... 30
Appendix A Engineering inspection contents... 33
Appendix B Engineering electrical testing methods and contents... 37
Appendix C Fiber channel and link testing... 57
Explanation of wording in this code... 60
List of quoted standards... 61
1 General provisions
1.0.1 This Code is formulated, to unify the technical requirements for construction
quality inspection, on-site inspection, completion acceptance of generic cabling system
projects for buildings and building complexes.
1.0.2 This Code is applicable to the acceptance of generic cabling system projects for
newly built, expanded, renovated buildings and building complexes.
1.0.3 During the construction process, the construction organization shall comply with
the requirements on construction quality inspection. The building organization shall
strengthen on-site quality inspection, through construction site representatives or
project supervisors; organize the inspection, signoff, certification work of concealed
work in a timely manner.
1.0.4 Self-test and completion acceptance test shall be carried out, before acceptance of
the generic cabling project.
1.0.5 In addition to complying with this Code, the acceptance of generic cabling system
projects shall also comply with the provisions of relevant national standards.
2 Abbreviation
ACR-F. Attenuation to Crosstalk Ratio at the Far-end
ACR-N. Attenuation to Crosstalk Ratio at the Near-end
d.c.. Direct Current Loop Resistance
ELTCTL. Equal Level TCTL
FEXT. Far End Crosstalk Attenuation (loss)
IL. Insertion Loss
NEXT. Near End Crosstalk Attenuation (loss)
OLT. Optical Line Termina1
OLTS. Optical Loss Test Set
OTDR. Optical Time Domain Reflectometer
PS NEXT. Power Sum Near End Crosstalk Attenuation (loss)
PS AACR-F. Power Sum Attenuation to Alien Crosstalk Ratio at the Far-end
PS AACR-Favg. Average Power Sum Attenuation to Alien Crosstalk Ratio at the
Far-end
PS ACR-F. Power Sum Attenuation to Crosstalk Ratio at the Far-end
PS ACR-N. Power Sum Attenuation to Crosstalk Ratio at the Near-end
PS ANEXT. Power Sum Alien Near-End Crosstalk (loss)
PS ANEXTavg. Average Power Sum Alien Near-End Crosstalk (loss)
PS FEXT. Power Sum Far End Crosstalk
RL. Return Loss
TCL. Transverse Conversion Loss
TCTL. Transverse Conversion Transfer Loss
3 Environment examination
3.0.1 The building environment examination of work areas, telecommunications rooms,
equipment rooms, etc. shall comply with the following requirements.
1 The civil works in the work area, telecommunications room, equipment room, user
unit area shall be completed. The floor of the building shall be flat and smooth; the
height and width of the door shall comply with the requirements of design
document.
2 The location, quantity, size of embedded trough boxes, concealed conduits, holes,
shafts in the building shall comply with the requirements of design document.
3 Where the raised floor is laid, the anti-static measures and earthing of the raised
floor shall comply with the requirements of design document.
4 The height -- from the bottom of the information socket box, which is concealed
or exposed on the wall or column to the ground -- should be 300 mm.
5 The height -- from the bottom of the information socket box, which is installed on
the side partition of the workbench to the adjacent wall -- should be 1000 mm.
6 The CP assembly point box and multi-user information socket box should be
installed on the inlet side of the duct, as well as on columns and load-bearing walls,
which are easy for maintenance. The height of the bottom edge of the box, above
the ground, should be 500 mm. When installed on the upper part of the wall or
column OR when installed in a suspended ceiling, the height from the ground
should not be less than 1800 mm.
4 Examination of equipment and test instrumentation
4.0.1 Equipment inspection shall comply with the following requirements.
1 The brand, model, specification, quantity, quality of cables and equipment, which
is used in the project, shall be inspected before construction. They shall comply
with the requirements of the design documents. They shall have corresponding
quality documents or certificates. If there are no exit-factory inspection
certification materials, quality documents, or those that do not conform to the
design, they shall not be used in the project;
2 Imported equipment and materials shall have certificates of origin and commodity
inspection certificates;
3 Inspected equipment shall be recorded. Unqualified equipment shall be stored
separately, for verification and treatment;
4 The cables and equipment used in the project shall be consistent with the order
contract or retained product samples, in terms of specifications, models, grades;
5 Spare parts, spare components and various documents shall be complete.
4.0.2 The examination of profiles, pipes, iron parts shall comply with the following
requirements.
1 For the examination of equipment used in underground communication pipelines
and manholes (hand holes) and the inspection of outdoor pipelines, it shall comply
with the relevant provisions of the current national standard "Code of construction
and acceptance for communication conduit engineering" GB 50374;
2 The materials, specifications, models of various profiles shall comply with the
requirements of the design documents; the surface shall be smooth and flat, without
deformation or breakage;
3 The surface coating or plating of metal conduits, bridges, wiring protection boxes,
junction boxes, etc. shall be uniform and complete, without deformation or damage;
4 When metal conduits or plastic conduits are used as indoor pipes, the pipe shall be
smooth without scars; the pipe hole shall not be deformed; the hole diameter and
wall thickness shall comply with the requirements of design document;
5 Metal pipe troughs shall be galvanized or otherwise anti-corrosion treated,
according to the requirements of the engineering environment. Plastic pipe troughs
shall be flame-retardant pipe troughs; the outer walls shall have flame-retardant
markings;
6 The materials and specifications of various metal parts shall meet the quality
requirements; there shall be no skew, twist, burr, break or damage;
7 The surface treatment and plating of metal parts shall be uniform and complete;
the surface shall be smooth, without defects such as falling off or blisters.
5 Examination of equipment installation
5.0.1 The specifications, capacity, location of cabinets, wiring boxes and other
equipment shall comply with the requirements of the design documents. The installation
shall comply with the following requirements.
1 The vertical deviation shall not be greater than 3 mm;
2 The various parts on the cabinet must not fall off or be damaged; the paint surface
shall not be peeled off or scratched; the various marks shall be complete and clear;
3 When installing wiring boxes in public places, the distance -- from the bottom edge
of the wall-embedded box to the ground -- should not be less than 1.5 m. The
distance -- from the bottom edge of the wall-hang box to the ground -- should not
be less than 1.8 m;
4 The opening and closing of the door lock shall be flexible and reliable;
5 Cabinets, wiring boxes, bridges and other equipment shall be installed firmly.
When there are seismic requirements, they shall be reinforced according to seismic
design.
5.0.2 The installation of various wiring components shall comply with the following
requirements.
1 All components shall be complete, installed in place; the marking shall be complete
and clear;
2 The mounting screws shall be tightened; the panel shall remain on a flat surface.
5.0.3 The installation of information socket modules shall comply with the following
requirements.
1 The installation position and height of the information socket bottom box, multi-
user information socket, assembly point wiring box, user unit information wiring
box shall comply with the requirements of design document.
2 When installed in the raised floor or on the ground, it shall be fixed in the junction
box. The socket panel shall be upright or horizontal. The junction box cover can be
opened and shall be waterproof, dustproof, pressure-resistant. The junction box
cover shall be flush with the ground.
3 When the information socket module and power socket are installed in the bottom
box of the information socket at the same time, the spacing and protective measures
taken shall comply with the requirements of design document.
4 The fixing method of the surface-mounted information socket bottom box shall be
determined, according to the construction site conditions.
5 The fixing screws shall be tightened; they shall not be loose.
6 Various socket panels shall be marked with colors, graphics, text, to indicate the
service type of the connected terminal equipment.
7 The optical fiber connecting devices and adapter installation bottom boxes for
terminating optical cables in the work area shall have space. They shall meet the
requirements of the design documents.
6 Examination of cable laying and protective measures
6.1 Cable laying
6.1.1 The laying of cables shall comply with the following requirements.
1 The type and specifications of cables shall be consistent with the design
requirements.
2 The laying method and layout spacing of cables in various environments shall
comply with the design requirements.
3 The cables shall be laid out naturally and straight, without twisting or looping; they
shall not be squeezed or damaged by external forces.
4 Cable joints must not appear in the routing of cables.
5 Both ends of the cable shall be labeled and numbered; the label writing shall be
clear, straight, correct. Labels shall be made of materials, that are not easily
damaged.
6 Cables shall have margin, to accommodate termination, final connection, testing,
changes. If there are special requirements, the length shall be reserved according
to the design requirements, which shall comply with the following requirements.
1) At the termination point of the twisted pair cable, the reserved length in the
bottom box of the information socket should be 30 mm ~ 60 mm in the work
area, 0.5 m ~ 2.0 m in the telecommunications room, 3 m ~ 5 m in the
equipment room;
2) Optical cable laying routes should be loop-reserved. The reserved length
should be 3 m ~ 5 m. The reserved length of the optical cable at the wiring
cabinet shall be 3 m ~ 5 m. The reserved length of the optical fiber at the floor
wiring box shall be 1.0 m ~ 1.5 m. The reserved length when terminating the
wiring box shall not be less than 0.5 m. When the fiber core is not terminated
at the wiring module, it shall retain the reserved length for optical cable
construction.
7 The bending radius of the cable shall comply with the following requirements.
1) The bending radius of unshielded and shielded 4-pair twisted cables shall not
be less than 4 times the outer diameter of the cable;
2) The bending radius of the trunk twisted pair cable shall not be less than 10
times the outer diameter of the cable;
3) The bending radius of 2-core or 4-core horizontal optical cables shall be greater
than 25 mm; the bending radius of horizontal optical cables, trunk optical
cables, outdoor optical cables, which have other core numbers, shall not be
less than 10 times the outer diameter of the optical cable;
4) The bending radius of G.657 and G.652 user optical cables shall comply with
the provisions of Table 6.1.1-1.
7 Cable termination
7.0.1 Cable termination shall comply with the following requirements.
1 Before terminating the cable, check whether the cable identification content is
correct;
2 The cable termination shall be firm and in good contact;
3 When connecting twisted pair cables to connecting devices, the wire numbers and
wire position color codes shall be identified; no inversion or misconnection is
allowed.
7.0.2 The termination of twisted pair cables shall comply with the following
requirements.
1 When terminating, each pair of twisted wires shall remain in a twisted state; the
untwisted length shall not be greater than 75 mm for category 3 cables, not greater
than 13 mm for category 5 cables, not greater than 6.4 mm for category 6 and above
cables.
2 When the twisted pairs are connected to the 8-bit modular universal socket, they
shall be connected according to the color code and the sequence of the wire pairs
(Figure 7.0.2-1). Both connection methods can be used; however, they shall not be
3 When terminating 4 pairs of twisted cables with non-RJ45 modules, they shall be
clipped, according to the wire serial number and the composed wire pair (Figure
7.0.2-2, Figure 7.0.2-3).
4 The shielding layer of the shielded twisted pair cable shall be reliably contacted
with the shielding cover at the termination of the connecting device, through
fastening devices. The cable shielding layer shall be in 360° circumferential contact
with the shielding cover of the connecting device; the contact length should not be
less than 10 mm.
5 For different shielded twisted pairs or shielded cables, different termination
methods shall be used for the shielding layer. The braid layer or metal foil shall be
effectively terminated to the bus conductors.
6 The bottom box of the information socket should not be used also as a crossing
box.
7.0.3 Optical fiber termination and splicing shall comply with the following
requirements.
1 Optical fibers and connecting devices can be connected, by pigtail fusion splicing
and mechanical connection;
2 Optical fiber and optical fiber can be connected by fusion splicing and optical
connector connection methods;
3 The optical fiber’s fusion splicing shall be protected and fixed.
7.0.4 The termination of various types of jumpers shall comply with the following
requirements.
1 There shall be good contact between various jumper cables and connecting devices;
the wiring connection is correct; the sign is complete. The type of jumper selected
shall meet the system design requirements.
2 The length and performance parameters of various types of jumpers shall comply
with the requirements of the design documents.
8 Engineering electrical testing
8.0.1 The electrical testing of generic cabling work shall include electrical performance
testing of cabling systems and performance testing of optical fiber cabling systems.
8.0.2 Generic cabling system’s engineering testing shall be carried out along with the
work.
8.0.3 The permanent link, CP link, channel testing of the twisted pair cabling system
shall comply with the following requirements.
1 For the generic cabling work, it shall conduct permanent link testing for each
completed information point. When the trunk cable uses cable, it can also be tested,
according to the connection model of the permanent link.
2 When performing quality certification of cable links to be used or in use, including
equipment cables and jumpers, testing may be conducted on a channel basis.
3 Component-level testing can be performed, when certifying jumpers and
equipment cables.
4 For the twisted pair cabling system link or channels, it shall test the index
parameters, such as the length, connection diagram, return loss, insertion loss, near
end crosstalk attenuation, power sum near end crosstalk attenuation, attenuation to
crosstalk ratio at the far-end, power sum attenuation to crosstalk ratio at the far-
end, attenuation to crosstalk ratio at the near-end, power sum attenuation to
crosstalk ratio at the near-end, loop resistance, delay, delay deviation, etc. The
index parameters shall comply with the provisions of Appendix B of this Code.
5 When site conditions permit, it should carry out random tests, for the external
power sum attenuation to crosstalk ratio at the near-end (PS ANEXT) and external
power sum attenuation to crosstalk ratio at the far-end (PS AACR-F) of EA class
and FA class twisted pair cabling systems.
6 The shielded cabling system shall comply with the test content, which is specified
in item 4 of Article 8.0.3 of this Code. It shall also test the conductive performance
of the shielding layer. When shielded cabling systems are used in industrial
Ethernet and data centers, virtual grounding shall also be excluded.
7 When the twisted pair cabling system is used in scenarios such as industrial
Ethernet, POE, high-speed channels, it can detect shielding characteristic
indicators such as TCL, ELTCTL, unbalanced resistance, coupling attenuation.
8.0.4 Performance testing of optical fiber cabling systems shall comply with the
following requirements.
1 Each optical fiber link in the optical fiber cabling system shall be tested. The
attenuation of the channel or link shall comply with the provisions of Appendix C
of this Code; it shall record the optical fiber length, which is obtained by the test;
2 When OM3 and OM4 optical fibers are used in links of 10 Gbit/s and above,
transmitting and receiving compensation optical fibers shall be used for
bidirectional OTDR testing;
3 When the testing results of the performance indicators of the optical fiber cabling
system cannot meet the design requirements, it should conduct fault positioning
test, through the OTDR test curve.
8.0.5 In the fiber-to-subscriber unit system engineering, it shall test each optical fiber
link between the user access point and the user unit information distribution box; the
attenuation index should be tested, using the insertion loss method.
8.0.6 The functions of the cabling system field tester shall comply with the following
requirements.
9 Management system acceptance
9.0.1 The cabling management system should be graded, according to the following
provisions.
1 The grade I management shall be targeted at the system in a single
telecommunications room or equipment room;
2 The grade II management shall be targeted at systems in multiple
telecommunications rooms or equipment rooms in the same building;
3 The grade III management shall be targeted at system of multiple buildings in the
same building complex, meanwhile it shall include internal and external systems
of the building;
4 The grade IV management shall be targeted at systems for multiple building
complexes.
9.0.2 The generic cabling management system shall comply with the following
requirements.
1 The selection of management system grade shall comply with the design
requirements;
2 Each component that needs to be managed shall be set with a label and represented
by a unique identifier. The setting of the identifier and label shall meet the design
requirements;
3 The record documents of the management system shall be detailed, complete, in
Chinese; they shall also include information, records, reports, drawings, etc. related
to each identifier;
4 Management systems at different levels can use general spreadsheets, special
management software or intelligent wiring systems, for maintenance and
management.
9.0.3 The setting of identifiers and labels of the generic cabling management system
shall comply with the following provisions.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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