Part-14 Structured Cabling Systems

14 STRUCTURED CABLING SYSTEMS ........................................................... 2
14.1 GENERAL ...................................................................................................... 2
14.1.1 Scope 2
14.1.2 Reference Standards 2
14.2 PRODUCTS ................................................................................................... 2
14.2.1 General 2
14.2.2 Copper Cables 2
14.2.3 Optical Fibre Cables 3
14.2.4 Patch Panels 4
14.2.5 Patch Cords/Line Cords 4
14.2.6 Outlets 5
14.3 INSTALLATION ............................................................................................. 5
14.3.1 Containment Systems 5
14.3.2 Testing and Commissioning 5

14 STRUCTURED CABLING SYSTEMS
14.1 GENERAL

14.1.1 Scope
1 This Part specifies the general requirements for structural cabling system used in data transmission applications for buildings or sub-systems thereof.

2 Related Parts and Sections are as follows:

This Section

Part 1 General Provisions for Electrical Installations
Part 6 Cables and Small Wiring
Part 7 Conduits and Conduit Boxes
Part 8 Trunking
Part 9 Cable Trays
Part 18 Uninterruptible Power Supply Systems
Part 23 Testing
14.1.2 Reference Standards
1 The following standards and documents of other organisations are referred to in this Part, and shall be complied with:

BS EN 60950 .............. Safety of information technology equipment, including electrical business equipment
EN 50173 ................... Information Technologies: Generic Cabling Systems
ISO/IEC 11801 ........... Generic Cabling for Customer Premise Cabling
EIA/TIA SP-2840
ANSI/EIA/TIA 455-30,46,51,53,61
ANSI/EIA/TIA 568A
ANSI/EIA/TIA 592-AAAA
ANSI/ICEA S-83-569 (Ref. B.1.40)
Bellcore TR-TSY-000020
14.2 PRODUCTS

14.2.1 General
1 The Contractor shall provide structured cabling installations for telephone and computer networks, including distribution frames, patch panels, racking systems (cabinets), patch cords, outlets, adaptors, conduits, PVC ducts and junction boxes, in accordance with the Project Specification and Drawings.

2 Wiring for cabling systems shall be carried out by a Specialist Contractor approved by the Engineer and Ooredoo, who has 5 years experience in Qatar.

14.2.2 Copper Cables
1 Copper cables shall be 24 AWG, 4 pair 0.170 mm diameter, polymer alloy jacket, category 5, unshielded twisted pair (UTP), suitable for extended multi-media transmission distance over frequency range up to 100 MHz, with extremely low noise characteristics.

2 Cables shall conform to ANSI/EIA/TIA 568A, Category 5 and EIA/TIA SP-2840 horizontal UTP.

3 Cables shall conform to the following performance data:

NEXT (dB) worst pair at 100 MHz : 38 dB

Attenuation (dB/100 m) : 22.0 dB/100 m

Impedance ±7 % (Typical) : 100 ohms ±7 %

14.2.3 Optical Fibre Cables
There are two types of optical fibre cables, one is multi-mode, graded index optical fibre and another is Single Mode optical fibre.
1 Multi-mode, Graded Index Optical Fibre.

(a) Multi-mode, graded index optical fibre.The multimode graded index optical fibre cables with nominal 62.5/125 µm core/cladding diameter, which are optimized for use in both wave lengths 850 nm and 1310 nm.

(b) Fibres shall comply with ANSI/EIA/TIA 592-AAAA (Ref. B1.18) and also with ANSI/EIA/TIA 568A Paragraph 12.5.1 on mechanical terminations.

2 Outdoor optical fibres shall comply with the same specifications, however cables shall also be, jelly filled, rodent proof specifically made for outdoor applications and shall be used for installation in ducts and shall be flexible and resistant to pulling and torsion forces, with 12 strands ,unless otherwise specified in the project specification.

(a) Optical fibres shall meet the graded-index multi-mode performance specified in Table 14.1.

Table 14.1

Graded-Index 62.5/125 µm Multi-mode Cable Characteristics

850 nm
1300 nm

Attenuation - dB/km
3.75
0.4

Bandwidth - MHz. km
160
500

(b) Attenuation shall be measured in accordance with EIA fibre optic test procedure ANSI/EIA/TIA 455-46, 61, or 53 (Ref. B1.39). Information transmission capacity shall be measured in accordance with the ANSI/EIA/TIA 455-51, or 30 (Ref. B1.39).

(c) Mechanical and environment specifications for indoor fibre optical cables shall be in accordance with ANSI/ICEA S-83-569 (Ref. B1.40). Outdoor fibre optic cables shall be in accordance with Bellcore TR-TSY-000020 (Ref. B1.36).

3 Single Mode Optical Fibre.

(a) The Single mode optical fibre cables which are optimized for use in both wave lengths 1310 nm and 1550 nm.

(b) The optical fibre cables shall meet the requirements stated in ITU-T Rec. by international telecommunication Union, BS EN 50173-3 standard.

(c) The fibre utilized in these cables have maximum attenuation at 1310 nm of 0.4 dB/km, at 1550 nm of 0.3 dB/km or less. If used for outdoor, then the fibre cable must be loose-tube non-dielectric type.

(d) Outdoor optical fibres shall comply with the same specifications, however cables shall also be jelly filled, rodent proof specifically made for outdoor applications and shall be used for installation in ducts and shall be flexible and resistant to pulling and torsion forces, with 12 strands ,unless otherwise specified in the project specification.

4 The single mode fibre shall be used for fibre optic network more than 300 m distance data transmission, unless otherwise justified by the manufacturer.

5 The above specified cables shall be new, unused and of current design and manufacture. Suitable optical fibre cables shall be selected based on the distance travel, bandwidth, indoor and outdoor application and shall be approved by the Engineer .The material of the fibre shall be silica glass fibre.

14.2.4 Patch Panels
1 Patch panels shall be type RJ45, 16 port, 1U type in rows of three with extension possible of up to six patch panels.

2 Patch panels shall be housed inside racking system (19” preferred) cabinets with hinged doors on either side and lockable front doors.

3 Ventilation slots shall be provided in both sides.

4 Rack size shall suit patch panels.

14.2.5 Patch Cords/Line Cords
1 Patch cords, shall be 2 metres long with adapters at both ends suitable for connection to RJ45 16 port IU patch panels.

2 Patch cords shall be Category 5 and be flexible enough to bend without loosing any performance.

3 Patch cords shall be the flexible stranded type.

4 Line cords shall have the same specifications as patch cords, however these shall be the solid type, used at wall outlets to connect computers or terminals to distribution cabling systems.

5 Cables shall comply with the performance data specified in Table 14.2.

Table 14.2

Specifications for Category 5 solid/stranded line cords or patch cords

Frequency
(MHz)
Attenuation
(Max. dB/305 m)
Next
(Min Loss dB/305 m)

1.00
6.80
62.0

4.00
14.0
53.0

10.0
22.4
47.0

16.0
28.3
44.0

20.0
31.7
42.0

25.0
35.9
41.0

31.25
40.9
40.0

62.5
59.3
35.0

100.0
76.1
32.0

14.2.6 Outlets
1 These shall be twin outlet type RJ45 to EN 60950 IBS 7008 having white moulded plastic plates with black shutters for computer outlets and white shutters for telephone outlets.

2 Outlets shall conform to the following specifications:

(a) Attenuation (dB) : <-0.12

(b) Return loss (dB) : <-21.54

(d) Voltage rating : >1050 V DC for 1 minute

14.3 INSTALLATION

14.3.1 Containment Systems
1 90 mm diameter or as approved by the Engineer, HDPE ducts and draw-pits shall be provided from external boundary walls to main distribution frame (MDF) positions and from the MDF to other buildings, as indicated on the Project Drawings.

2 Conduits, trunking and cable trays shall be provided for structured cabling installations, complying with Parts 7, 8 and 9 respectively of Section 21. The minimum conduit size shall be 25mm.

3 The computer wiring shall be laid from the user outlets up to the computer room (server) without any joints in between. Moreover the maximum length of a single run shall not exceed 90 meters, otherwise amplification of signal shall be provided.

4 All public offices and buildings shall be equipped with a complete wireless access points through the building.

14.3.2 Testing and Commissioning
1 General

(a) the Specialist Contractor shall test the complete cabling network to ensure that noise is not interfering with systems and contact resistance are kept within acceptable levels

(b) certificates shall be supplied by the Specialist Contractor to certify efficient working of the networks.

2 Copper Cable and Connectors: Each RJ-45 Jack connector shall be tested to ensure Category 5 performance. Each RJ-45 Jack shall be tested for Point to Point connectivity, by utilising hand held time domain reflectometers (TDR), capable of generating pulses of 100 MHz, and of testing that the following parameters are in accordance with EIA/TIA 568A:

(a) Wire mapping for correct polarity

(b) Length for point to point connectivity under 90 metres

(d) Resistance

(e) Impedance

(f) Capacitance

(g) Noise

(h) Attenuation

3 Optical fibre cable shall comply with the following:

(a) certificates of compliance with EIA/TIA specifications, and manufacturer’s test certificates attached to the reels/drums

(b) white light tests shall be performed to confirm end to end connectivity on delivery to site, after installation and prior to field termination

(c) after field termination point to point connectivity shall be tested on each cable by a hand held optical time domain reflectometer, (OTDR), or optical power light meter and light source, capable of reading and measuring signal loss by generating wave lengths of 950 mm and 1300 mm. This shall check the field termination loss and that no damage has occurred from macro/micro bending.

END OF PART