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10P10C
A modular connector is a type of electrical connector for cords and cables of electronic devices and appliances, such as in computer networking, telecommunication equipment, and audio headsets. Modular connectors were originally developed for use on specific Bell System telephone sets in the 1960s, and similar types found use for simple interconnection of customer-provided telephone subscriber premises equipment to the telephone network. The Federal Communications Commission (FCC) mandated in 1976 an interface registration system, in which they became known as registered jacks. The convenience of prior existence for designers and ease of use led to a proliferation of modular connectors for many other applications. Many applications that originally used bulkier, more expensive connectors have converted to modular connectors. Probably the best-known applications of modular connectors are for telephone and Ethernet. Accordingly, various electronic interface specifications exist f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Registered Jack
A registered jack (RJ) is a standardized telecommunication network interface device, network interface for connecting voice and data equipment to a computer service provided by a local exchange carrier or long distance carrier. Registered interfaces were first defined in the ''Universal Service Ordering Code'' (USOC) 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. Subsequently, in 1980 they were 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 th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tinsel Wire
Tinsel wire is a type of electrical wire used for applications that require high mechanical flexibility but low current-carrying capacity. Tinsel wire is commonly used in cords of telephones, handsets, headphones, and small electrical appliances. It is far more resistant to metal fatigue failure than either stranded wire or solid wire. Construction Tinsel wire is produced by wrapping several strands of thin metal foil around a flexible nylon or textile core. Because the foil is very thin, the bend radius imposed on the foil is much greater than the thickness of the foil, leading to a low probability of metal fatigue. Meanwhile, the core provides high tensile strength without impairing flexibility. Typically, multiple tinsel wires are jacketed with an insulating layer to form one conductor. A cord is formed from several conductors in either a round profile or a flat cable. Connections Tinsel wire is commonly connected to equipment with crimped terminal lugs that pierce the i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Modified Modular Jack
The Modified Modular Jack (MMJ) is a small form-factor serial port connector developed by Digital Equipment Corporation (DEC). It uses a modified version of the 6P6C modular connector with the latch displaced off-center so that standard modular connectors for telephone jacks cannot accidentally be plugged in. MMJ connections are used on Digital minicomputers, such as the PDP-11, VAX and Alpha systems, and to connect terminals, printers, and serial console servers. The MMJ connector has six conductors. As defined by DEC, the six pins are Tx and Rx for the data transmission, their return paths, and DSR and DTR for handshaking. The transmit and receive signals are differential: each signal is the voltage difference between the line and its associated ground, as opposed to a voltage on a single connector relative to a common reference. The electrical signaling is defined by the EIA RS-422 standard. The system can interoperate with RS-232 signaling by shorting the lower voltage sid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Digital Equipment Corporation
Digital Equipment Corporation (DEC ), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The company was co-founded by Ken Olsen and Harlan Anderson in 1957. Olsen was president until he was forced to resign in 1992, after the company had gone into precipitous decline. The company produced many different product lines over its history. It is best known for the work in the minicomputer market starting in the early 1960s. The company produced a series of machines known as the Programmed Data Processor, PDP line, with the PDP-8 and PDP-11 being among the most successful minis in history. Their success was only surpassed by another DEC product, the late-1970s VAX "supermini" systems that were designed to replace the PDP-11. Although a number of competitors had successfully competed with Digital through the 1970s, the VAX cemented the company's place as a leading vendor in the computer space. As microcomputers improved in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Siemon Company
The Siemon Company is an American telecommunications company founded in 1903 that provides IT infrastructure hardware and services for data centers, local area networks (LANs) and intelligent buildings. The Siemon Company offers copper and optical fiber cabling systems, cabinets, racks, cable management, data center power and cooling systems. History The Siemon Company was founded in Bridgeport, Connecticut Bridgeport is the List of municipalities in Connecticut, most populous city in the U.S. state of Connecticut and the List of cities in New England by population, fifth-most populous city in New England, with a population of 148,654 in 2020. Loc ..., in 1903. In 1906, The Siemon Company began manufacturing of a three-pole connecting block for AT&T. AT&T's three-pole connecting blocks were ceramic and fragile. Carl Siemon manufactured a durable plastic version identical to the AT&T block and became a supplier for AT&T and the later "Baby Bells." In 1923, the company a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crimp (joining)
Crimping is a method of joining two or more pieces of metal or other Ductility, ductile material by Deformation (engineering), deforming one or both of them to hold the other. The bend or deformity is called the crimp. Crimping tools are used to create crimps. Crimping is used extensively in metalworking, including to contain bullets in cartridge (weaponry), cartridge cases, for Crimp connection, electrical connections, and for securing lids on canning, metal food cans. Because it can be a cold-working technique, crimping can also be used to form a strong bond between the workpiece and a non-metallic component. It is also used to connect two pieces of food dough. Tools A crimping tool or crimp tool is used to create crimps. Crimping tools range in size from small handheld devices, to benchtop machines used for industrial purposes, to large fully-automatic wire processing machines for high-volume production. For electrical crimps, a wide variety of crimping tools exist, and the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strain Relief
Cable management refers to management of electrical cable, electrical or optical cable in a Enclosure (electrical), cabinet or an installation. The term is used for products, workmanship or planning. Cables can easily become tangled, making them difficult to work with, sometimes resulting in devices accidentally becoming unplugged as one attempts to move a cable. Such cases are known as "cable spaghetti", and any kind of problem diagnosis and future updates to such enclosures could be very difficult. Cable management both supports and contains cables during installation, and makes subsequent maintenance or changes to the cable system easier. Products such as cable trays, cable ladders, and cable baskets are used to support a cable through cabling routes. Cable selection The choice of cables is also important; for instance, ribbon cables used to connect Parallel ATA drives to the motherboard can disrupt the airflow inside of computers, making case fans less effective; most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
