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, Edition 3, is being prepared which will unify 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:

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

The standard defines several classes of optical fiber interconnect:

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 has been added for individual wire pairs and the cable as a whole. Besides the shield, the twisting of the pairs and number of turns per unit length increases RF shielding and protects from crosstalk.

The Category 7 cable standard has been created to allow 10 Gigabit Ethernet over 100 m of copper cabling (also, 10 Gbit/s Ethernet now is typically run on Cat 6A). 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]

As of November 2010, all manufacturers of active equipment have chosen to support the 8P8C for their 10 Gigabit Ethernet products on [2] copper and not the GG45, ARJ45, or TERA in order to function on Cat 6A.

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). Each pair offers 1200 MHz of bandwidth.

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]

Category 7A is not recognized in TIA/EIA-568.

Category 8

In March 2013, technical recommendation ISO/IEC TR 11801-99-1,[5][6][7] issued by ISO/IEC JTC 1 computer interconnect and premises cabling group SC25 WG3, defined two new categories for 4-pair copper twisted pair cable with 2 connectors, with operating frequency up to 1600 MHz and possible overhead for 2000 MHz:[8]

Also in March 2013, technical recommendation TIA TR42.7 defined that 40GBASE-T will require a new cabling system defined to at least 1.6 GHz and up to 2 GHz, currently called Category 8, which will use the standard 8P8C connector.[9] Category 8 should be fully backward compatible with Category 6A and below, and will be covered by ANSI/TIA-568-C.2-1 "Specifications for 100 Ω Category 8 Cabling".[10]

As of January 2014, draft versions of ISO/IEC TR 11801-99-1 and ANSI/TIA-568-C.2-1 have been aligned to reduce the difference between Categories 8, 8.1 and 8.2.[7] The final specifications will depend on transceiver requirements to be defined by IEEE 802.3bq (40GBASE-T) workforce.[8]

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).

Edition 3

Edition 3, currently being prepared by ISO/IEC JTC 1/SC 25 "Interconnection of information technology equipment", is a major revision of the standard which will unify several prior standards for commercial, home, and industrial networks, as well as data centers, and define requirements for generic cabling and distributed building networks.

The new series of standards will include six parts: [5][11]

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: 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 ISO/IEC TR 24704 Cabling for distributed wireless networks for building automation and IOT devices


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, 2012
  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. 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. Retrieved July 9, 2011.
  5. 1 2 Flatman, Alan (2013-05-16). "ISO/IEC TR 11801-99-1: Guidance on 40GBASE-T Cabling -a tutorial-" (PDF). Retrieved 2014-01-26.
  6. Flatman, Alan (2013-11-11). "Update on ISO/IEC 11801-99-1 Guidance on 40GBASE-T Cabling" (PDF). Retrieved 2014-07-09.
  7. 1 2 Flatman, Alan (2014-01-23). "Update on ISO/IEC 11801-99-1 40GBASE-T Cabling Guidelines" (PDF). Retrieved 2014-07-09.
  8. 1 2 "40GBASE-T/Category 8 Update" (PDF). Retrieved 2016-10-02.
  9. Sullivan, Ed (2013-05-01). "How Cat 8 cable will economically solve data centers' need for high bandwidth". Cabling Installation & Maintenance. Retrieved 2014-01-01.
  10. "Archived copy". Archived from the original on 2014-01-08. Retrieved 2014-01-08.
  11. "Standards - ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment". Retrieved 2016-10-02.


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