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In such an installation, the fireproofing around the incoming or outgoing cables must also be extended to cover the junction box to prevent short circuits inside the box during an accidental fire. The foregoing is just a brief overview and must not be used as a substitute for the actual National Electrical Code. Many computer networks use a simple line code to transmit one type of signal using a medium's full bandwidth using its baseband (from zero through the highest frequency needed). An appropriate type (such as that shown in the gallery) may be buried in the plaster of a wall (although full concealment is no longer allowed by modern codes and standards) or cast into concrete-with only the cover visible. Full duplex (FDX) DOCSIS allows upstream and downstream signals to simultaneously occupy a single frequency range without time division multiplexing. If there are not many fiber-optic cables to the node, wavelength division multiplexing can be used to combine multiple optical signals onto the same fiber. If too many splitters are used to connect multiple TVs, the signal levels will decrease, and picture quality on analog channels will decrease. However, in the event of multiple failures of redundant computers, the A320 does have a mechanical back-up system for its pitch trim and its rudder, the Airbus A340 has a purely electrical (not electronic) back-up rudder control system and beginning with the A380, all flight-control systems have back-up systems that are purely electrical through the use of a "three-axis Backup Control Module" (BCM).

Later, with the advent of digital telecommunications, the term was mainly used for transmission over multiple channels. At the local community, an optical node translates the signal from a light beam to radio frequency (RF), and sends it over coaxial cable lines for distribution to subscriber residences. Each transmitter and receiver services one optical node. Usually trunk amplifiers have two output ports: one for the trunk, and another as a bridger. To prevent interference of signals, the frequency band is divided into two sections. Other countries use different band sizes, but are similar in that there is much more bandwidth for downstream communication than for upstream communication. Services on these systems are carried on RF signals in the 5 MHz to 1000 MHz frequency band. The very first HFC networks, and very old unupgraded HFC networks, are only one-way systems. In 1953, C-COR was the first to introduce cable powering which transmits power through coaxial cables for powering cable amplifiers. Launched into production during 1984, the Airbus Industries Airbus A320 became the first airliner to fly with an all-digital fly-by-wire control system. Junction boxes form an integral part of a circuit protection system where circuit integrity has to be provided, as for emergency lighting or emergency power lines, or the wiring between a nuclear reactor and a control room.

The term junction box may also be used for a larger item, such as a piece of street furniture. In May 1837 they patented their system. ATX allowed each motherboard manufacturer to put these ports in a rectangular area on the back of the system with an arrangement they could define themselves, though a number of general patterns depending on what ports the motherboard offers have been followed by most manufacturers. A PV junction box is attached to the back of the solar panel and it is its output interface. Electrical junction box in the process of installation. Swedish junction box in Kuhlo-style with lever-connector Wago 221, where ground and neutral are connected in common. Electrical conduits terminate at the sides and cables pass through or are joined inside the box. HFC replaced coaxial cable networks which had coaxial trunk cables originating at the headend of the network, and HFC replaced part of these trunk cables with fiber optic cables and optical nodes. A fiber optic node has a broadband optical receiver, which converts the downstream optically modulated signal coming from the headend or hub to an electrical signal going to the customers.

Remote MACPHY, besides achieving the same purpose as Remote PHY, also moves all DOCSIS protocol functionality to the optical node or the outside plant, which can reduce latency when compared to Remote PHY. Alternatively Remote PHY can allow for a CMTS/CCAP to be located in a remote data center away from customers. CCAPs aim to replace the conventional, integrated CMTS which only provides data and Edge QAMs used for video which are separate pieces of equipment. Interactive satellite systems are less competitive in urban environments because of their large round-trip delay times, but are attractive in rural areas and other environments with insufficient or no deployed terrestrial infrastructure. Any safety-critical component in a digital fly-by-wire system including applications of the laws of aeronautics and computer operating systems will need to be certified to DO-178C Level A or B, depending on the class of aircraft, which is applicable for preventing potential catastrophic failures.

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