IEEE Spectrum

Issue 8 • Aug. 1991

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  • The United States in space

    Publication Year: 1991, Page(s):18 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The US program is examined in three contexts: its position internationally, its role domestically, and NASA's workings internally. Some of the principal issues explored are: what it means for NASA to be simply a lead agency instead of the sole agency charged with implementing the US space program; whether the types of technical and managerial troubles NASA has recently experienced are different in... View full abstract»

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  • A guide to data communications: high-speed local-area networks

    Publication Year: 1991, Page(s):26 - 31
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (474 KB)

    Local area network (LAN) classifications based on speed are defined. The use of optical fiber, the fiber distributed data interface (FDDI) multitoken protocol, linear buses, and the dual queue distributed bus (DQDB) is examined. LAN limits are discussed. Supercomputer LANs and ultra-gigabit networks are considered. The so-called mass of glass, a wavelength-division-multiplexed architecture consist... View full abstract»

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  • A guide to data communications: interconnecting LANs

    Publication Year: 1991, Page(s):32 - 34 37
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (665 KB)

    The use of T1 multiplexers, bridges, routers, and gateways to tie together LANs spread over areas from a single building to a metropolitan area is addressed. What each of these does is described. Also discussed are backbone networks for LANs. Network planning, transmission facilities, switched services, and network management are considered with reference to interconnected LANs.<> View full abstract»

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  • A guide to data communications: B-ISDN and how it works

    Publication Year: 1991, Page(s):39 - 42
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (623 KB)

    The capabilities of the emerging broadband integrated services digital network (B-ISDN) are examined. Fundamental differences between broadband and narrowband ISDN are identified. The basics of asynchronous transfer mode (ATM), the switching technique used by BISDN networks, are discussed. Channel identification, generic flow control, using ATM, and connectionless service are considered. The first... View full abstract»

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