RJ-45 - definição. O que é RJ-45. Significado, conceito
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O que (quem) é RJ-45 - definição

STANDARDIZED TELECOMMUNICATION NETWORK INTERFACE, INCLUDING CONNECTORS AND WIRING STANDARDS
RJ11, RJ14, RJ25; RJ14; RJ-45 Connector; RJ-11; Western plug; Western jack; RJ-XX; RJ-14; RJ-25; Registered Jack; RJ61; USOC (cabling); RJ21; Rj21; RJ-48; Phone cord; Rj12; Rj-12; Universal Service Ordering Code; Universal Service Order Code; RJ-12; RJ25; RJ12; 50-pin Telco connector; Rj48; RJ48; RJ11; RJ connector; RJ-61; RJ-11, RJ-12, RJ-14, RJ-25; Registered jacks; TIA-968-A; RJ21x; RJ21X; Rj21x; RJ-21; Rj-45; RJ41; True RJ45; RJ-45; List of registered jacks; Registered Jack naming confusion; Registered jack naming confusion; TIA-1096-A; Rj45; Administrative Council for Terminal Attachment; TIA-968-B; Administrative Council for Terminal Attachments; RJ45 (telecommunications); RJ-45 connector; RJ11 Connectors; RJ-48C; RJ11 socket; Ethernet jack
  • 6P4C crimp-on style connector commonly used for RJ11 and RJ14
  • Female RJ21 connector; Pin assignment is coordinated with the table.
  • 8P8C keyed female connector (jack)
  •  6P6C jack, may be used for RJ11, RJ14, and RJ25.
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RJ-45         
<hardware> A serial connector which looks very much like a standard telephone connector, except it houses eight wires instead of four. RJ-45s are typically found on computers either integrated into the mother board or on a NIC. Because they are so small they are often used on devices such as {terminal servers} that have many ports. Ethernet (10baseT) and Token Ring sometimes use four wires of an RJ-45 plug, 100baseVG uses all eight. 100BaseTX uses the same four wires of the RJ-45 connector as 10baseT but the wire must be category 5 instead of {category 3}. [Would the cable normally be shielded twisted pair or unshielded twisted pair?] (2004-05-22)
Registered jack         
A registered jack (RJ) is a standardized telecommunication network interface for connecting voice and data equipment to a service provided by a local exchange carrier or long distance carrier. Registration interfaces were first defined in the Universal Service Ordering Code (USOC) system of the Bell System in the United States for complying with the registration program for customer-supplied telephone equipment mandated by the Federal Communications Commission (FCC) in the 1970s.
RJ-11         
<hardware, communications> An American-style telephone jack with six possible connections. A telephone normally uses two pairs of wires. Often found on the back of US-manufactured modems or for connection to a leased line. (1998-06-30)

Wikipédia

Registered jack

A registered jack (RJ) is a standardized telecommunication network interface for connecting voice and data equipment to a service provided by a local exchange carrier or long distance carrier. Registration interfaces were first defined in the Universal Service Ordering Code (USOC) system of the Bell System in the United States for complying with the registration program for customer-supplied telephone equipment mandated by the Federal Communications Commission (FCC) in the 1970s. They were subsequently codified in title 47 of the Code of Federal Regulations Part 68. Registered jack connections began to see use after their invention in 1973 by Bell Labs. The specification includes physical construction, wiring, and signal semantics. Accordingly, registered jacks are primarily named by the letters RJ, followed by two digits that express the type. Additional letter suffixes indicate minor variations. For example, RJ11, RJ14, and RJ25 are the most commonly used interfaces for telephone connections for one-, two-, and three-line service, respectively. Although these standards are legal definitions in the United States, some interfaces are used worldwide.

The connectors used for registered jack installations are primarily the modular connector and the 50-pin miniature ribbon connector. For example, RJ11 uses a six-position two-conductor connector (6P2C), RJ14 uses a six-position four-conductor (6P4C) modular jack, while RJ21 uses a 25-pair (50-pin) miniature ribbon connector.