User talk:Goldsmith007

Horizontal Twisted-Pair Cable •	Solid 4-pair 0.51mm (24 AWG) specified [0.64mm (22 AWG) solid also allowed]. An overall shield is optional. •	Performance marking should be provided to show the applicable performance category. These markings do not replace safety markings •	Color-coding: white/blue - blue white/orange - orange white/green - green white/brown - brown Twisted-Pair PCords and Cross-Connect Jumpers •	Patch cords should use stranded cable for adequate flex-life. •	Stranded cables must meet the minimum performance requirements for horizontal cable except that 20 percent more attenuation for UTP is allowed by '568-B.2 and 50 percent more attenuation is allowed by '11801:2002 for UTP and F/UTP. •	Color-code for cross-connect jumpers: One conductor white, the other a visibly distinct color such as red or blue. •	Performance markings should be provided to show the applicable transmission category in addition to safety markings. •	Insulated O.D. of stranded wires should be 0.8mm (0.032 in.) to 1mm (0.039 in.) to fit into a modular plug. •	Production performance specifications for plug cord assemblies are addressed in '568-B.2. •	Color Codes for Stranded, 100Ω Patch Cord Option 1 	 	Option 2 white/blue - blue	pair 1	green - red white/orange - orange	pair 2	black - yellow white/green - green	pair 3	blue - orange white/brown - brown	pair 4	brown - slate

Note: Because of their identical pair groupings, patch cords terminated with either T568A or T568B pair assignments may be used interchangeably, provided that both ends are terminated with the same pin/pair scheme. Multi-Pair Cable •	Performance markings should be provided to show the applicable performance category. These markings do not replace safety markings. •	Services with incompatible signal levels should be partitioned into separate binder groups. Guidelines for shared sheaths are provided in Annex B of '568-B.1. •	Transmission requirements are equivalent to horizontal cables except that hybrid requirements apply when multiple cable units are contained within the same sheath. •	Note: Tip conductors have colored insulation that corresponds to that of the binder group. Ring conductors have colored insulation that corresponds to that of the pair. •	Backbone twisted-pair cables consist of solid 0.51mm (24 AWG) cables that contain more than four pairs (typically multiples of 25-pairs are used). An overall shield is optional. •	Color-coding (specified by reference to ICEA: see chart below). Color-Coding (Specified by Reference to ICEA) Modular Wiring Reference Modular Jack Styles: There are four basic modular jack styles. The 8-position modular outlets are commonly and incorrectly referred to as "RJ45". The 6-position modular jack is commonly referred to as an RJ11. Using these terms can sometimes lead to confusion since the RJ designations actually refer to very specific wiring configurations called Universal Service Order Code (USOC). The designation 'RJ' means Registered Jack. Each of these basic jack styles can be wired for different RJ configurations. For example, the 6-position jack can be wired as an RJ11C (1-pair), RJ14C (2-pair), or RJ25C (3-pair) configuration. An 8-position jack can be wired for configurations such as RJ61C (4-pair) and RJ48C. The keyed 8-position jack can be wired for RJ45S, RJ46S, and RJ47S.

Modular Plug Pair Configurations It is important that the pairing of wires in the modular plug match the pairs in the modular jack as well as the horizontal and backbone wiring. If they do not, the data being transmitted may be paired with incompatible signals. Modular cords wired to the T568A color scheme on both ends are compatible with T568B systems and vice versa. UTP Horizontal Cable (solid 24 AWG)

Straight-Through or Reversed? Modular cords are used for two basic applications. One application uses them for patching between modular patch panels. When used in this manner modular cords should always be wired "straight-through" (pin 1 to pin 1, pin 2 to pin 2, pin 3 to pin 3, etc.). The second major application uses modular cords to connect the workstation equipment (PC, phone, FAX, etc.) to the modular outlet. These modular cords may either be wired "straight-through" or "reversed" (pin 1 to pin 6, pin 2 to pin 5, pin 3 to pin 4, etc.) depending on the system manufacturer's specifications. This "reversed" wiring is typically used for voice systems. The following is a guide to determine what type of modular cord you have. How to Read a Modular Cord Align the plugs side-by-side with the contacts facing you and compare the wire colors from left to right. If the colors appear in the same order on both plugs, the cord is wired "straightthrough". If the colors appear reversed on the second plug (from right to left), the cord is wired "reversed". Common Outlet Configurations Two wiring schemes have been adopted by the '568-B.1 and '11801:2002 standards. They are nearly identical except that pairs two and three are reversed. T568A is the preferred scheme because it is compatible with 1 or 2-pair USOC systems. Either configuration can be used for Integrated Services Digital Network (ISDN) and high speed data applications. Transmission categories 3, 5e, and 6 are only applicable to this type of pair grouping. USOC wiring is available for 1-, 2-, 3-, or 4-pair systems. Pair 1 occupies the center conductors, pair 2 occupies the next two contacts out, etc. One advantage to this scheme is that a 6-position plug configured with 1, 2, or 3 pairs can be inserted into an 8-position jack and still maintain pair continuity. A note of warning though, pins 1 and 8 on the jack may become damaged from this practice. A disadvantage is the poor transmission performance associated with this type of pair sequence. None of these pair schemes is cabling standard compliant. 10BASE-T and 100BASE-TX wiring specifies an 8-position jack but uses only two pairs. These are pairs two and three of T568A and T568B schemes. 1000BASE-T and 10GBASE-T wiring specifies an 8-position jack. Can be either the T568A or T568B configuration. (See above) Token Ring wiring uses either an 8-position or 6-position jack. The 8-position format is compatible with T568A, T568B, and USOC wiring schemes. The 6-position is compatible with 1- or 2-pair USOC wiring. ANSI X3T9.5 TP-PMD uses the two outer pairs of an 8-position jack. These positions are designated as pair 3 and pair 4 of the T568A wiring scheme. This wiring scheme is also used for ATM.

Recommended Cabling Practices Do's: •	Terminate each horizontal cable on a dedicated telecommunications outlet. •	Locate the main cross-connect near the center of the building to limit cable distances. •	Maintain the twist of horizontal and backbone cable pairs up to the point of termination. •	Tie and dress horizontal cables neatly and with a minimum bend radius of 4 times the cable diameter. •	Use hook and loop tie wraps. Don'ts: •	Do not use connecting hardware that is of a lower category than the cable being used. •	Do not create multiple appearances of the same cable at several distribution points (called bridged taps). •	Do not over-tighten cable ties, use staples, or make sharp bends with cables. •	Do not place cable near equipment that may generate high levels of electromagnetic interference. Twisted-Pair Connector Terminations •	Pair twists shall be maintained as close as possible to the point of termination. •	Untwisting shall not exceed 75mm (3.0 in) for category 3 links and 13mm (0.5 in) for category 5e and higher links. •	Connecting hardware shall be installed to provide well-organized installation with cable management and in accordance with manufacturer's guidelines. •	Strip back only as much jacket as is required to terminate individual pairs. TWISTED-PAIR CABLING INSTALLATION PRACTICES •	To avoid stretching, pulling tension should not exceed 110N (25 lbƒ) for 4-pair cables. •	Installed bend radii shall not exceed: o	4 times the cable diameter for horizontal UTP cables under no load conditions. o	8 times the cable diameter for horizontal ScTP cables. o	10 times the cable diameter for multi-pair backbone twisted-pair cables under no load conditions. •	Horizontal cables should be used with connecting hardware and patch cords (or jumpers) of the same performance category or higher. •	Avoid cable stress, as caused by: o	cable twist during pulling or installation o	tension in suspended cable runs o	tightly cinched cable ties or staples o	tight bend radii •	Important Note: Installed twisted-pair cabling shall be classified by the least performing component in the link.