ISO/IEC 11801

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 covers both balanced copper cabling and optical fibre cabling.

The standard was designed for use within commercial premises that may consist of either a single building or of multiple buildings on a campus. It was optimized for premises that span up to 3 km, up to 1 km2 office space, with between 50 and 50,000 persons, but can also be applied for installations outside this range.

A major revision was released in November 2017, unifying requirements for commercial, home and industrial networks.

Classes and categories

The standard defines several link/channel classes and cabling categories of twisted-pair copper interconnects, which differ in the maximum frequency for which a certain channel performance is required:

  • Class A: link/channel up to 100 kHz using Category 1 cable/connectors
  • Class B: link/channel up to 1 MHz using Category 2 cable/connectors
  • Class C: link/channel up to 16 MHz using Category 3 cable/connectors
  • Class D: link/channel up to 100 MHz using Category 5e cable/connectors
  • Class E: link/channel up to 250 MHz using Category 6 cable/connectors
  • Class EA: link/channel up to 500 MHz using Category 6A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.)
  • Class F: link/channel up to 600 MHz using Category 7 cable/connectors
  • Class FA: link/channel up to 1000 MHz using Category 7A cable/connectors (Amendment 1 and 2 to ISO/IEC 11801, 2nd Ed.)
  • Class I: link/channel up to 2000 MHz using Category 8.1 cable/connectors (specification under development)
  • Class II: link/channel up to 2000 MHz using Category 8.2 cable/connectors (specification under development)

The standard link impedance is 100 Ω (The older 1995 version of the standard also permitted 120 Ω and 150 Ω in Classes A−C, but this was removed from the 2002 edition).

The standard defines several classes of optical fiber interconnect:

  • OM1: Multimode fiber type 62.5 µm core; minimum modal bandwidth of 200 MHz·km at 850 nm
  • OM2: Multimode fiber type 50 µm core; minimum modal bandwidth of 500 MHz·km at 850 nm
  • OM3: Multimode fiber type 50 µm core; minimum modal bandwidth of 2000 MHz·km at 850 nm
  • OM4: Multimode fiber type 50 µm core; minimum modal bandwidth of 4700 MHz·km at 850 nm
  • OM5: Multimode fiber type 50 µm core; minimum modal bandwidth of 4700 MHz·km at 850 nm and 2470 MHz·km at 953 nm
  • OS1: Single-mode fiber type 1 dB/km attenuation at 1310 and 1550 nm
  • OS1a: Single-mode fiber type 1 dB/km attenuation at 1310, 1383, and 1550 nm
  • OS2: Single-mode fiber type 0.4 dB/km attenuation at 1310, 1383, and 1550 nm


OM5 fiber is designed for wideband applications using SWDM multiplexing of 4-16 carriers (40G=4λ×10G, 100G=4λ×25G, 400G=4×4λ×25G) in the 850-953 nm range.

Category 7

Category 7 S/FTP cable

Class F channel and Category 7 cable are backward compatible with Class D/Category 5e and Class E/Category 6. Class F features even stricter specifications for crosstalk and system noise than Class E. To achieve this, shielding was added for individual wire pairs and the cable as a whole. Unshielded cables rely on the quality of the twists to protect from EMI. This involves a tight twist and carefully controlled design. Cables with individual shielding per pair such as category 7 rely mostly on the shield and therefore have pairs with longer twists.

The Category 7 cable standard was ratified in 2002 to allow 10 Gigabit Ethernet over 100 m of copper cabling. The cable contains four twisted copper wire pairs, just like the earlier standards. Category 7 cable can be terminated either with 8P8C compatible GG45 electrical connectors which incorporate the 8P8C standard or with TERA connectors. When combined with GG-45 or TERA connectors, Category 7 cable is rated for transmission frequencies of up to 600 MHz.[1]

However, in 2008 Category 6A was ratified and allows 10 Gbit/s Ethernet while still using the traditional 8P8C connector. Therefore, all manufacturers of active equipment and network cards have chosen to support the 8P8C for their 10 Gigabit Ethernet products on [2] copper and not the GG45, ARJ45, or TERA. These products therefore require a Class EA channel (Cat 6A).

As of 2017 there is no equipment that has connectors supporting the Class F (Category 7) channel.

Category 7 is not recognized by the TIA/EIA.

Category 7A

Class FA (Class F Augmented) channels and Category 7A cables, introduced by ISO 11801 Edition 2 Amendment 2 (2010), are defined at frequencies up to 1000 MHz, suitable for multiple applications including CATV (862 MHz).

The intent of the Class FA was to possibly support the future 40Gigabit Ethernet: 40Gbase-T. Simulation results have shown that 40 Gigabit Ethernet may be possible at 50 meters and 100 Gigabit Ethernet at 15 meters. In 2007, researchers at Pennsylvania State University predicted that either 32 nm or 22 nm circuits would allow for 100 Gigabit Ethernet at 100 meters.[3][4]

However, in 2016, the IEEE 802.3bq working group ratified the amendment 3 which defines 25Gbase-T and 40gbase-T on Category 8 cabling specified to 2000 MHz. The Class FA therefore does not support 40G Ethernet.

As of 2017 there is no equipment that has connectors supporting the Class FA (Category 7A) channel.

Category 7A is not recognized in TIA/EIA.

Category 8

Category 8 was ratified by the TR43 working group under ANSI/TIA 568-C.2-1. It is defined up 2000 MHz and only for distances from 30 m to 36 m depending on the patch cords used. ISO is expected to ratify the equivalent in 2018 but will have 2 options:

  • Class I channel (Category 8.1 cable): minimum cable design U/FTP or F/UTP, fully backward compatible and interoperable with Class EA (Category 6A) using 8P8C connectors
  • Class II channel (Category 8.2 cable): F/FTP or S/FTP minimum, interoperable with Class FA (Category 7A) using TERA or GG45.

Category 8 is designed only for data centers where distances between switches and servers are short. It is not intended for general office cabling.

Acronyms for twisted pairs

Annex E, Acronyms for balanced cables, provides a system to specify the exact construction for both unshielded and shielded balanced twisted pair cables. It uses three letters - U for unshielded, S for braided shielding, and F for foil shielding - to form a two-part abbreviation in the form of xx/xTP, where the first part specifies the type of overall cable shielding, and the second part specifies shielding for individual cable elements.

Common cable types include U/UTP (unshielded cable); U/FTP (individual pair shielding without the overall screen); F/UTP, S/UTP, or SF/UTP (overall screen without individual shielding); and F/FTP, S/FTP, or SF/FTP (overall screen with individual foil shielding).

2017 Edition

In November 2017, a new edition was released by ISO/IEC JTC 1/SC 25 "Interconnection of information technology equipment". It is a major revision of the standard which has unified several prior standards for commercial, home, and industrial networks, as well as data centers, and defines requirements for generic cabling and distributed building networks.

The new series of standards replaces the former 11801 standard and includes six parts:[5][6] [7]

ISO/IEC Standard Title Replaces Description
ISO/IEC 11801-1 Part 1: General requirements ISO/IEC 11801 Generic cabling requirements for twisted-pair and optical fiber cables
ISO/IEC 11801-2 Part 2: Office premises ISO/IEC 11801 Cabling for commercial (enterprise) buildings
ISO/IEC 11801-3 Part 3: Industrial premises ISO/IEC 24702 Cabling for industrial buildings, with applications including automation, process control, and monitoring
ISO/IEC 11801-4 Part 4: Single-tenant homes ISO/IEC 15018 Cabling for residential buildings, including 1200 MHz links for CATV/SATV applications
ISO/IEC 11801-5 Part 5: Data centers ISO/IEC 24764 Cabling for high-performance networks used by data centers
ISO/IEC 11801-6 Part 6: Distributed building services Cabling for distributed wireless networks for building automation and IOT devices


  • ISO/IEC 11801:1995 (Ed. 1) - First Edition
  • ISO/IEC 11801:2000 (Ed. 1.1) - Edition 1, Amendment 1
  • ISO/IEC 11801:2002 (Ed. 2) - Second Edition
  • ISO/IEC 11801:2008 (Ed. 2.1) - Edition 2, Amendment 1
  • ISO/IEC 11801:2010 (Ed. 2.2) - Edition 2, Amendment 2
  • ISO/IEC 11801-(1-6):2017 - current edition

See also


  1. ^ Nielsen, Allan (2008), AMP NETCONNECT Guide to ISO/IEC 11801 2nd Edition Including Amendment 1 (PDF), Schaffhausen, Switzerland: Tyco Electronics, p. 11, Archived from the original on February 3, 2014, retrieved March 11, 2012CS1 maint: Unfit url (link)
  2. ^ Hansen, Carl G. (November 2010). "10GABSE-T for Broad 10_Gigabit Adoption in the Data Center". Ethernet Alliance November 2010.
  3. ^ "Researchers push transmission rate of copper cables". News release. Pennsylvania State University. November 14, 2007. Archived from the original on February 22, 2012. Retrieved July 9, 2011.
  4. ^ Rick C. Hodgin (November 14, 2007). "UPDATE: Cat 7 copper theorized to transmit 100 Gbit/s in excess of 100 meters (328 ft) using future modems". TGDaily blog. Archived from the original on August 3, 2009. Retrieved July 9, 2011.
  5. ^ Flatman, Alan (2013-05-16). "ISO/IEC TR 11801-99-1: Guidance on 40GBASE-T Cabling -a tutorial-" (PDF). Retrieved 2014-01-26.
  6. ^ "Standards - ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment". Retrieved 2016-10-02.
  7. ^ International Organization for Standardization. "Interconnection of information technology equipment". International Organization for Standardization. Retrieved 23 January 2018.

Further reading

  • International standard ISO/IEC 11801: Information technology — Generic cabling for customer premises.
  • European standard EN 50173: Information technology — Generic cabling systems. 1995.
10 Gigabit Ethernet

10 Gigabit Ethernet (10GE, 10GbE, or 10 GigE) is a group of computer networking technologies for transmitting Ethernet frames at a rate of 10 gigabits per second. It was first defined by the IEEE 802.3ae-2002 standard. Unlike previous Ethernet standards, 10 Gigabit Ethernet defines only full-duplex point-to-point links which are generally connected by network switches; shared-medium CSMA/CD operation has not been carried over from the previous generations Ethernet standards so half-duplex operation and repeater hubs do not exist in 10GbE.The 10 Gigabit Ethernet standard encompasses a number of different physical layer (PHY) standards. A networking device, such as a switch or a network interface controller may have different PHY types through pluggable PHY modules, such as those based on SFP+. Like previous versions of Ethernet, 10GbE can use either copper or fiber cabling. Maximum distance over copper cable is 100 meters but because of its bandwidth requirements, higher-grade cables are required.The adoption of 10 Gigabit Ethernet has been more gradual than previous revisions of Ethernet: in 2007, one million 10GbE ports were shipped, in 2009 two million ports were shipped, and in 2010 over three million ports were shipped, with an estimated nine million ports in 2011. As of 2012, although the price per gigabit of bandwidth for 10 Gigabit Ethernet was about one-third compared to Gigabit Ethernet, the price per port of 10 Gigabit Ethernet still hindered more widespread adoption.


In computer networking hardware, ARJ45 (Augmented Registered Jack 45) is an electronic connector for very high speed applications, such as Class FA installations as defined by the standard ISO/IEC 11801 and 10, 40 and 100 Gigabit Ethernet transmission copper cabling.

ARJ45 complies with the international standard IEC 61076-3-110.The connector operates in the frequency spectrum between 600 MHz to 5 GHz with shielded twisted pair and twinax cables. ARJ45 utilises an internal system of Faraday cages to reduce cross talk to 35 dB or better at 5 GHz. Its performance up to 1000 MHz corresponds to category 7A connecting hardware.

Variants include ARJ45 HS, an 8-contact connector, and ARJ45 HD, a 12-contact connector, equivalent to the GG45 with a switch in the jack that activates the alternative pin locations when a RJ45 plug is inserted.

Category 6 cable

Category 6 cable, commonly referred to as Cat 6, is a standardized twisted pair cable for Ethernet and other network physical layers that is backward compatible with the Category 5/5e and Category 3 cable standards.

Compared with Cat 5 and Cat 5e, Cat 6 features more stringent specifications for crosstalk and system noise. The cable standard also specifies performance of up to 250 MHz compared to 100 MHz for Cat 5 and Cat 5e.Whereas Category 6 cable has a reduced maximum length of 55 meters when used for 10GBASE-T, Category 6A cable (or Augmented Category 6) is characterized to 500 MHz and has improved alien crosstalk characteristics, allowing 10GBASE-T to be run for the same 100 meter maximum distance as previous Ethernet variants.

Copper cable certification

In copper twisted pair wire networks, copper cable certification is achieved through a thorough series of tests in accordance with Telecommunications Industry Association (TIA) or International Organization for Standardization (ISO) standards. These tests are done using a certification-testing tool, which provide pass or fail information. While certification can be performed by the owner of the network, certification is primarily done by datacom contractors. It is this certification that allows the contractors to warranty their work.

Fibre to the office

Fiber to the office (FTTO) is an alternative cabling concept for local area network (LAN) network office environments. It combines passive elements (fibre optic cabling, patch panels, splice boxes, connectors and standard copper 8P8C patch cords) and active mini-switches (called FTTO switches) to provide end devices with Gigabit Ethernet. FTTO involves centralised optical fibre cabling techniques to create a combined backbone/horizontal channel; this channel is provided from the work areas to the centralised cross-connect or interconnect by allowing the use of pull-through cables or splices in the telecommunications room.


ISO/IEC JTC 1/SC 25 Interconnection of information technology equipment is a standardization subcommittee of the Joint Technical Committee ISO/IEC JTC 1, of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), which develops and facilitates standards within the field of interconnection of information technology equipment. The international secretariat of ISO/IEC JTC 1/SC 25 is the Deutsches Institut für Normung (DIN) located in Germany.

List of International Organization for Standardization standards, 11000-11999

This is a list of published International Organization for Standardization (ISO) standards and other deliverables. For a complete and up-to-date list of all the ISO standards, see the ISO catalogue.The standards are protected by copyright and most of them must be purchased. However, about 300 of the standards produced by ISO and IEC's Joint Technical Committee 1 (JTC1) have been made freely and publicly available.

Modular connector

A modular connector is a type of electrical connector for cords and cables of electronic devices and appliances, such in computer networking, telecommunication equipment, and audio headsets.

Modular connectors were originally developed for use on specific Bell System telephone sets in the 1960s, and similar types found use for simple interconnection of customer-provided telephone subscriber premises equipment to the telephone network. The Federal Communication Commission (FCC) mandated in 1976 an interface registration system, in which they became known as registered jacks. The convenience of prior existence for designers and ease of use led to proliferation of modular connectors for many other applications. Many applications that originally used a bulkier, more expensive connector have converted to modular connectors. Probably the best known applications of modular connectors are for telephone and Ethernet.

Accordingly, various electronic interface specifications exist for applications using modular connectors, which prescribe physical characteristics and assign electrical signals to their contacts.

Multi-mode optical fiber

Multi-mode optical fiber is a type of optical fiber mostly used for communication over short distances, such as within a building or on a campus. Typical multi-mode links have data rates of 10 Mbit/s to 10 Gbit/s over link lengths of up to 600 meters (2000 feet). Multi-mode fiber has a fairly large core diameter that enables multiple light modes to be propagated and limits the maximum length of a transmission link because of modal dispersion.

Optical fiber cable

An optical fiber cable, also known as a fiber optic cable, is an assembly similar to an electrical cable, but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically individually coated with plastic layers and contained in a protective tube suitable for the environment where the cable will be deployed. Different types of cable are used for different applications, for example long distance telecommunication, or providing a high-speed data connection between different parts of a building.

Single-mode optical fiber

In fiber-optic communication, a single-mode optical fiber (SMF) is an optical fiber designed to carry light only directly down the fiber - the transverse mode. Modes are the possible solutions of the Helmholtz equation for waves, which is obtained by combining Maxwell's equations and the boundary conditions. These modes define the way the wave travels through space, i.e. how the wave is distributed in space. Waves can have the same mode but have different frequencies. This is the case in single-mode fibers, where we can have waves with different frequencies, but of the same mode, which means that they are distributed in space in the same way, and that gives us a single ray of light. Although the ray travels parallel to the length of the fiber, it is often called transverse mode since its electromagnetic oscillations occur perpendicular (transverse) to the length of the fiber. The 2009 Nobel Prize in Physics was awarded to Charles K. Kao for his theoretical work on the single-mode optical fiber.

Structured cabling

In telecommunications, structured cabling is building or campus cabling infrastructure that consists of a number of standardized smaller elements (hence structured) called subsystems.


ANSI/TIA-568 is a set of telecommunications standards from the Telecommunications Industry Association (TIA). The standards address commercial building cabling for telecommunications products and services.

As of 2017, the standard is at revision D, replacing the 2009 revision C, 2001 revision B, the 1995 revision A, and the initial issue of 1991, which are now obsolete.Perhaps the best known features of ANSI/TIA-568 are the pin/pair assignments for eight-conductor 100-ohm balanced twisted pair cabling. These assignments are named T568A and T568B.

An IEC standard ISO/IEC 11801 provides similar standards for network cables.

Twisted pair

Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together for the purposes of improving electromagnetic compatibility. Compared to a single conductor or an untwisted balanced pair, a twisted pair reduces electromagnetic radiation from the pair and crosstalk between neighboring pairs and improves rejection of external electromagnetic interference. It was invented by Alexander Graham Bell.

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