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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.
For larger cable assemblies more complex schemes, such as the 25-pair color code, are used. Some telephone technicians used mnemonic phrases, such as red-right-ring-rear, or ring-right-red-rough, to remember that the red wire connects to the right-side post in the wall jack and to the ring on the plug and to the rear lug on main distribution ...
Inside large buildings, and in the outdoor cables that run to the telephone company POP, many telephone lines are bundled together in a single cable using the 25-pair color code. [7] Outside plant cables can have up to 3,600 or 3,800 pairs, used at the entrances of telephone exchanges. [8] [9]
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 ...
File:25 pair color code chart.svg. Size of this PNG preview of this SVG file: 300 × 600 pixels. Other resolutions: 120 × 240 pixels | 240 × 480 pixels | 384 × 768 pixels | 512 × 1,024 pixels | 1,024 × 2,048 pixels | 375 × 750 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.
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 ...
Telco cable. 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 ...
25-pair color code; Basic exchange telecommunications radio service; Category 1 cable; Dual-tone multi-frequency signaling; Local telephone service; Managed facilities-based voice network; Network interface device; Publicly Available Telephone Services; Registered jack – the type of telephone jack common in most of the world for single-line ...