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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.

Contents

Classes and categories[edit]

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 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:

Category 7[edit]

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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. 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 has been 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[edit]

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).["citation needed]

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.["citation needed] 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 F (Category 7) channel.

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

Category 8[edit]

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 to 36m depending on the patch cords used. ISO is expected to ratify the equivalent in 2017 or 2018 but will have 2 options:

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

Acronyms for twisted pairs[edit]

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[edit]

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][6]

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

Versions[edit]

See also[edit]

References[edit]

  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. 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". ISO.org. Retrieved 2016-10-02. 

Further reading[edit]

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