Standard Table for Classification of Optical Cable Line Levels
Optical cable lines are classified by fiber type, transmission distance, bandwidth, and application, following ITU-T and ISO/IEC standards.
Optical Cable Classification Table
| Level / Type | Fiber Type | Typical Bandwidth | Maximum Distance | Typical Applications | Standard References |
|---|---|---|---|---|---|
| OS1 | Single-mode | Up to 1 Gbps (legacy) | ≤ 2 km (indoor) | Indoor backbone, short-distance building connections | ITU-T G.652, ISO/IEC 11801 |
| OS2 | Single-mode | 10 Gbps and above | ≥ 10 km (outdoor) | Long-distance, campus backbone, data center interconnects | ITU-T G.652, G.657 |
| OM3 | Multimode (laser-optimized) | 10–40 Gbps | 300–400 m | Enterprise LANs, 10G/40G links | ISO/IEC 11801, TIA-568 |
| OM4 | Multimode (enhanced laser-optimized) | 10–100 Gbps | 400–550 m | High-speed LANs, 40G/100G links | ISO/IEC 11801, TIA-568 |
| OM5 | Multimode (wideband, SWDM) | 40–400 Gbps | 150–550 m | Data centers, short wavelength division multiplexing (SWDM) | ISO/IEC 11801, TIA-568 |
| Loose Tube | Single or multimode | Varies by fiber | Long-distance outdoor | Outdoor backbone, high fiber count | ITU-T G.652, G.655 |
| Ribbon Cable | Single or multimode | Varies | Medium to long | Mass fusion splicing, high-density applications | ITU-T G.657 |
| Unitube / Multitube | Single or multimode | Varies | Short to long | Last-mile connectivity, duct installations | ITU-T G.652, G.657 |
| Armoured | Single or multimode | Varies | Short to long | Rodent-resistant, harsh environments | ITU-T G.652, G.657 |
Notes on Classification
- Single-mode fibers (OS1, OS2) are optimized for long-distance transmission with minimal attenuation and are suitable for outdoor and backbone networks .
- Multimode fibers (OM3, OM4, OM5) are designed for high-speed, short-to-medium distance applications, often in data centers and enterprise LANs .
- Loose tube and ribbon cables are packaging types that affect installation flexibility, fiber density, and splicing efficiency .
- Armoured cables provide mechanical protection for outdoor or harsh environments, often used in ducts or direct burial .
- ITU-T Recommendations such as G.652, G.657, and G.65x series define fiber characteristics, attenuation, and environmental performance . This table provides a comprehensive overview of optical cable lines by level, helping engineers and planners select the appropriate fiber type and cable construction for specific network requirements.
Information Fiber Optic & Cable Standards Guide | FiberMania Standards
Get a complete guide to fiber optic & related products standards—from basics to advanced, covering all key details for
Information Fibre Optic Cabling Basics
The EN 50173-1 standard describes different categories of fibre-optical cables (OM1, OM2, OM3, OM4, OS1, OS2) and different
Information OPTICAL FIBER CLASSIFICATIONS UNDER ISO 11801 & EN
A lot better known and more widely used than plastic fibre optics, these glass fibres are special in that they can carry several light
Information The Most Comprehensive Guide Of Optical Modules
Explore the ultimate guide to optical modules. Learn types, functions, performance metrics
Information Fiber Optic Cable Types | SMB & Campus Backbones –
Practical guide to fiber optic cable types for SMB and campus networks. Compare OS2 vs
Information Recommendation ITU-T G.652 (08/2024)
This document outlines the specifications for a single-mode optical fiber and cable designed for use around the 1310 nm zero
Information Optical Fiber and Cable Characteristics
Chromatic dispersion specification for G.652.D fibres has been changed into boundary line specification. In clause 6.10 the text
Information ISO/IEC 11801
OverviewClasses and categoriesAbbreviations for twisted pairs2017 editionVersionsFurther reading
International standard ISO/IEC 11801 Information technology — Generic cabling for customer premises specifies general-purpose telecommunication cabling systems (structured cabling) that are suitable for a wide range of applications (analog and ISDN telephony, various data communication standards, building control systems, factory automation). It is published by ISO/IEC JTC 1/SC 25/WG 3 of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It cover
Information The Fiber Optic Association
Standards for premises cabling are described in the FOA Reference Guide to Premises Cabling. More detailed information can be
Information Fibre Optic Cabling Basics
Fibre Optic Cabling Basics Fibre Optic Cabling Basics The EN 50173-1 standard describes different categories of fibre-optical cables
Information Optical Level
There are optical connectors and splices that have loss, and of course the cable itself has loss. To an extent, the loss in the optical
Information Fiber-optic cable
A fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable but containing one or more
Information Fiber Optic Cable Types – Multimode and Single Mode
The Optical Core – a glass tube (core) propagates the light signals through the fiber cable. Glass is inherently reflective and is a
Information The FOA Reference For Fiber Optics
Designers of fiber optic cable plants and networks depend on these specifications to determine if networks will work for the planned
Information The FOA Reference For Fiber Optics
(Here is a table of link losses from industry standards for many links.) The designer should analyze link loss early in the design stage
Information What does OS1, OS2, OM1, OM2, OM3 and OM4 mean? | Proterial
These are fiber optic cable designations that originated in the international ISO/IEC 11801 standard. The designations indicate a
Information Fiber Optic Cable Types: A Complete Guide
The plethora of fiber optic cable types can seem overwhelming, but choosing the right cable
Information Structured Cabling Specifications and Standards
Structured Cabling Specifications and Standards In the past, companies often had several cabling infrastructures because no single
Information Optical fibre standards and norms
In the case of optical fibres, the appropriate group for describing standards on the characteristics of transmission media and photonic
Information The differences between optical fiber grades A, B, C, and D
In summary, optical fiber grades A, B, C, and D differ significantly in terms of their end-face quality standards, which directly impact
Information Multimode Fiber Types: OM1 vs OM2 vs OM3 vs OM4 vs OM5
Identified by ISO 11801 standard, multimode fiber optic cables can be classified into OM1 fiber, OM2 fiber, OM3 fiber,
Information The FOA Reference For Fiber Optics
Topic: Fiber Optic Cable Table of Contents: The FOA Reference Guide To Fiber Optics Fiber Optic Cable
Information The differences between optical fiber grades A, B, C, and D
These grades are defined by standards that specify acceptable tolerances for various geometric parameters of the fiber end-face.
Information Handbook Optical fibres, cables and systems
The optical fibres are specified in ITU-T with reference to the geometrical, optical, transmission and mechanical attributes listed in
Information FIBER OPTIC STANDARDS
The attachment of communication cables to transmission line poles is limited to JEA owned fiber optic cables only. The installation
Information ISO/IEC 11801
International standard ISO/IEC 11801 Information technology — Generic cabling for customer premises specifies general-purpose