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A common application of the 25-pair color code is the cabling for the Registered Jack interface RJ21, which uses a female 50-pin miniature ribbon connector, as shown in the following table. The geometry of the pins of the receptacle (right hand image) corresponds to the pin numbers of the table.
25-pair color code chart used in certain kinds of wiring. A color code is a system for encoding and representing non-color information with colors to facilitate communication. This information tends to be categorical (representing unordered/qualitative categories) though may also be sequential (representing an ordered/quantitative variable).
A telephone set (keyset) could operate as many lines as it had pickup keys (buttons) installed. Most keysets with up to nine lines are connected to the system using a single 25-pair cable terminated with an Amphenol 50-position "MicroRibbon" connector. Sets with up to 19 line positions used a 50-pair cable and the large instruments with 29 line ...
Unshielded twisted pair (UTP) cables are found in many Ethernet networks and telephone systems. For indoor telephone applications, UTP is often grouped into sets of 25 pairs according to a standard 25-pair color code originally developed by AT&T Corporation. A typical subset of these colours (white/blue, blue/white, white/orange, orange/white ...
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A standard 52-card French-suited deck comprises 13 ranks in each of the four suits: clubs ( ♣ ), diamonds ( ♦ ), hearts ( ♥) and spades ( ♠ ). Each suit includes three court cards (face cards), King, Queen and Jack, with reversible (i.e. double headed) images. Each suit also includes ten numeral cards or pip cards, from one (Ace) to ten.
Both physical layers require a balanced twisted pair with an impedance of 100 Ω. The cable must be capable of transmitting 600 MHz for 1000BASE-T1 and 66 MHz for 100BASE-T1. 2.5 Gb/s, 5 Gb/s, and 10 Gb/s over a 15 m single pair is standardized in 802.3ch-2020. [25] In June 2023, 802.3cy added 25 Gb/s speeds at lengths up to 11 m. [26]
However, the number of total colors can be decreased by encoding each value with multiple colors, as in the 25-pair color code, which encodes 25 values using only 10 colors, by assigning each value a color each from group A and group B, each consisting of 5 colors. A qualitative color scheme can be designed similarly to a harmonious color scheme.