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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.
This connector type is also known as telco, 25-pair, miniature delta ribbon, mini D ribbon, delta ribbon, MDR, Amphenol, or CHAMP miniature ribbon connector. Although it was invented by Amphenol, [1] many companies now produce it, such as 3M, TE Connectivity, and Hirose Electric Group. Two major sizes are available.
A telco cable, also known as a Telecom cable or Amphenol cable, is a thick cable used for connecting multiple voice or data lines for LANs or telecommunications. The ends use 25 pairs of polarized pins (50 pins total). [1] This cable handles up to 25 data channels or phone lines. [2] The name Amphenol comes from the company that first ...
The 25-pair standard non-split 66 block contains 50 rows; each row has two (E) or four (M) or six (A) & (B) columns of clips that are electrically bonded. The 25-pair split 50 66 block is the industry standard for easy termination of voice cabling, and is a standard network termination by telephone companies—generally on commercial properties ...
For example, RJ11 and RJ14 use female six-position modular connectors, and RJ21 uses a 25-pair (50-pin) miniature ribbon connector. RJ11 uses two conductors in a six-position female modular connector, so can be made with any female six-position modular connector, while RJ14 uses four, so can be made with either a 6P4C or a 6P6C connector.
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 positions used 75 pairs on three connectors.
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