These cable sets have a transmitter board located in the computer, an expansion board in the remote backplane, and a cable between the two.Īctive versus passive backplanes ISA Passive Backplane showing connectors and parallel signal traces on back side. In addition, there are bus expansion cables which will extend a computer bus to an external backplane, usually located in an enclosure, to provide more or different slots than the host computer provides. To transmit information, Serial Back-Plane technology uses a low-voltage differential signaling transmission method for sending information. For example, DIN 41612 connectors (used in the VMEbus system) have three durability grades built to withstand (respectively) 50, 400 and 500 insertions and removals, or "mating cycles". A backplane does not suffer from this problem, so its service life is limited only by the longevity of its connectors. ![]() In a cabled system, the cables need to be flexed every time that a card is added or removed from the system this flexing eventually causes mechanical failures. ![]() A backplane uses plug-in cards for storage and processing.Įarly microcomputer systems like the Altair 8800 used a backplane for the processor and expansion cards.īackplanes are normally used in preference to cables because of their greater reliability. Backplanes commonly use a printed circuit board, but wire-wrapped backplanes have also been used in minicomputers and high-reliability applications.Ī backplane is generally differentiated from a motherboard by the lack of on-board processing and storage elements. It is used to connect several printed circuit boards together to make up a complete computer system. Major components on a PICMG 1.3 active backplane Wire-wrapped backplane from a 1960s PDP-8 minicomputerĪ backplane (or "backplane system") is a group of electrical connectors in parallel with each other, so that each pin of each connector is linked to the same relative pin of all the other connectors, forming a computer bus.
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