SAES-T-624 PDF - Telecommunications Outside Plant - Fiber Optics - PDFYAR

This article is about SAES-T-624 which is about Telecommunications Outside Plant – Fiber Optics Design and download SAES-T-624 PDF for telecommunication and electrical engineers, supervisors and project managers, telecom QCs, telecom QC Supervisors. This is saudi aramco standards of Telecommunication Engineering based on international codes and standards and useful for telecom and electronics engineering knowledge to get job as engineers, QC Supervisors and QC managers, Engineering managers and technicians.

SAES-T-624 pDF Download

SAES-T-624

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Telecommunications Outside Plant – Fiber Optics Design

In the design of fiber optic systems, the following terms and definitions are important:

Attenuation: It refers to the decrease in energy transmission (loss of light) and is measured in decibels (dB). Attenuation in optical fibers is mainly caused by absorption and scattering losses.
Coating: It is a layer of composite plastic material that covers the fiber, providing mechanical protection.
Core: The central region of an optical fiber made of glass, which facilitates the transmission of light.
Multimode: It refers to a fiber that allows the propagation of more than one optical mode.
Single Mode: It describes a fiber that supports the propagation of only one mode.
Operating Wavelength: It denotes the specified light wavelength at which a system operates, usually expressed in nanometers (nm). Single-mode fibers can operate at wavelengths of 1,300 nm or 1,550 nm.
Optical Link Loss Budget: It represents the total allowable losses for the satisfactory operation of an optical fiber system.
Pigtails: These are small single-fiber cords used for terminating optical fiber cables at Central Offices (COs) or regenerators. They have a connector at one end to interface with the equipment and a bare fiber at the other end for splicing to a fiber in the main cable.
Splice Loss: It refers to the loss of light energy caused by angular misalignment, fiber end separation, or lateral displacement of fiber axes.

In terms of design documentation for telecommunications projects involving fiber optic systems, the following information should be included:

Fiber cable data:
a) Cable manufacturer and vendor number.
b) Cable size (number of fibers).
c) Cable type (filled or air core).
d) Cable make-up (dielectric or non-dielectric).
e) Type of fiber (multimode or single-mode).
f) Dispersion shifted or non-dispersion shifted.
g) Transmission characteristics (dB loss/km at a given wavelength and multimode bandwidth/km).
h) Dispersion specification in ps/(nm . km).
i) Fiber packaging (single fiber/loose buffer, multiple fiber/loose buffer, tight buffer, channel/groove or ribbon type, and color code).
Other information:
a) Trunk number/cable number.
b) Span number.
c) Manhole number and duct number.
d) Wall-to-wall measurements of conduits between manholes.
e) Major intersections and key streets.
f) Fiber cable splice points with station location.
g) Splice-to-splice cable lengths.
h) Record the footage and/or meter markings on the engineering design construction drawings.
i) Changes in cable route.
j) Substructures (pipes, utilities, etc.) with station location.
k) Location of marker posts and signs.

These details should be included in the schematic drawings prepared for each fiber optic span or cable route as part of the telecommunications work order or project.

Design Drawings Classification

In the design of fiber optic work orders or projects, the design drawings are classified into three groups for consistency and convenience. These groups are:

Cable Drawing (Cable Schematic):
a) This drawing represents the cable layout and includes all the necessary information for installation, removal, or rearrangement of fiber optic cable and associated equipment. It also indicates the address or location of the cable route and fiber terminal.
b) Cable layout drawings should not refer to layouts on other sheets not associated with the cable layout.
c) Fiber cables should be properly identified using the designated Saudi Aramco fiber cable symbols specified in SAES-T-018.
d) Fiber terminating equipment (panels) should be symbolized using the appropriate fiber terminal symbols specified in SAES-T-018, indicating the terminal number, cable count, and fiber terminating capacity.
e) The cable drawing section should include all fiber cable-related functions, such as splicing symbols and sequences, fiber cable characteristics and parameters, test information, and other directly cable-related functions.
f) Detail drawings of the fiber cable route, termination, and other cable details should be shown in the “Detail Drawings” section.
Trench Drawing (Trench Schematic):
a) The trench layout drawing provides complete information related to trench and conduit work. It includes symbols for proposed trenches, conduits, manhole substructures, and other relevant symbols.
b) Detailed drawings of trench sections, manhole layouts, and other specific details should be shown in the “Detail Drawings” section.
Detail Drawings (Detail Schematic):
a) This section contains drawings that show detailed presentations of any part of the cable or trench drawings.
b) Any additional drawings presented to enhance readability and layout presentation in the cable and trench schematics should be included in this section.

The different drawing classifications should be separated and grouped on a sheet or drawing page basis. In the case of small-sized jobs, more than one section may be accommodated on a drawing sheet as long as they are properly segregated by dividing lines and identified accordingly.

FAQs about SAES-T-624 pDF Download

Q1: What is the purpose of fiber optic design in SAES-T-624?

A: The design of fiber optic systems in SAES-T-624 aims to provide guidelines for the construction and installation of telecommunications outside plant (OSP) facilities using fiber optics, ensuring optimal performance and reliability.

Q2: What is the significance of attenuation in fiber optics?

A: Attenuation is crucial in fiber optics as it measures the loss of light energy during transmission. It is important to minimize attenuation to maintain signal integrity and achieve longer transmission distances.

Q3: How does coating contribute to fiber optic design?

A: Coating plays a vital role in fiber optic design as it provides mechanical protection to the fiber. It helps prevent damage and maintain the structural integrity of the fiber during installation and operation.

Q4: What is the difference between multimode and single-mode fibers?

A: Multimode fibers allow the propagation of multiple optical modes, enabling the transmission of signals over shorter distances. Single-mode fibers support the propagation of only one mode, enabling longer-distance transmission with reduced signal dispersion.

Q5: Why is the operating wavelength important in fiber optic design?

A: The operating wavelength specifies the light wavelength at which the fiber optic system is designed to operate. It ensures compatibility between the components and facilitates efficient signal transmission.

Q6: What is the purpose of an optical link loss budget?

A: The optical link loss budget defines the allowable losses in an optical fiber system. It ensures that the system can achieve satisfactory operation while accounting for losses from various components, such as connectors, splices, and fiber lengths.

Q7: How are pigtails used in fiber optic design?

A: Pigtails are employed for terminating optical fiber cables. They provide a connector interface for equipment connection and enable splicing with fibers in the main cable, facilitating the expansion and flexibility of the fiber optic system.

Q8: What is splice loss, and why is it important?

A: Splice loss refers to the loss of light energy that occurs during the process of splicing optical fibers. It is important to minimize splice loss to maintain signal integrity and ensure efficient transmission within the fiber optic system.

SAES-T-624 PDF – Telecommunications Outside Plant – Fiber Optics