cabling standards

   National cabling standards, concerned with the performance of cables and connectors under conditions of actual use, are specified by the National Electric Code, American National Standards Institute, and Underwriters Laboratories. Other standards have been specified by the Electronics Industry Association/ Telecommunications Industries Association (EIA/TIA). Standards include:

   • ANSI/EIA/TIA-568-1991 Commercial Building Telecommunications Wiring.

   • EIA/TIA TSB-36 Additional Cable Specifications for UTP Cables. 1991.

   • EIA/TIA TSB-40 Telecommunications Systems Bulletin—Additional Transmission Specifications for UTP Connecting Hardware. 1992.

   • ANSI/EIA/TIA-568A 1995 revises the original 568 document and adds material from TSB-36 and TSB-40.

   • ANSI/EIA/TIA-569-1990 Commercial Building Standard for Telecommunications Pathways and Spaces.

   • ANSI/EIA/TIA-570-1991 Residential and Light Commercial Telecommunications Wiring Standard.

   • ANSI/EIA/TIA-606-1993Administration Standard for the Telecommunications Infrastructure of Commercial Buildings.

   • ANSI/EIA/TIA-607-1994 Commercial Building Grounding and Bonding Requirements for Telecommunications.

   There are several types of caches:

   • Direct-mapped cache

   A location in the Local codes and standards may impose additional requirements. Underwriters Laboratories (UL) tests cable and other devices to determine the conditions under which the device will function safely. Two important tests for cable performance are:

   cache corresponds to several specific locations in memory, so when the processor calls for certain data, the cache can locate it quickly. However, since several blocks in RAM correspond to that same location in the cache, the cache may spend its time refreshing itself and calling main memory.

   • Fully associative cache

   Information from RAM may be placed in any free blocks in the cache so that the most recently accessed data is usually present; however, the search to find that information may be slow because the cache has to index the data in order to find it.

   • Set-associative cache

   Information from UL-910, which tests smoke emission and flame spread for plenum cable UL-1666, which tests smoke emission and flame spread for riser cable

   See Connection Admission Control.