• Question

  • How far has WDMA reached in India? Is there any scope for development!!??
    Friday, February 23, 2007 2:38 PM


All replies

  • friends u may reply!!!! cheer up!
    Friday, February 23, 2007 4:47 PM
  • WDMA-----  Word DMA
    Friday, February 23, 2007 4:49 PM
  • Wideband Division Multiple Access (having a carrier frequency band so wide lots of people and data can be squeezed in at once on slightly different frequencies) – and combinations, like TDCMA to get even more out of systems
    Friday, February 23, 2007 4:51 PM
  • do u know wats the difference between CDMA and WDMA ? I heard that japan uses WDMA for communication unless we use CDMA.
    Friday, February 23, 2007 5:13 PM
  • In fibre-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes multiple optical carrier signals on a single optical fibre by using different wavelengths (colours) of laser light to carry different signals. This allows for a multiplication in capacity, in addition to making it possible to perform bidirectional communications over one strand of fibre.

    The term wavelength-division multiplexing is commonly applied to an optical carrier (which is typically described by its wavelength), whereas frequency-division multiplexing typically applies to a radio carrier (which is more often described by frequency). However, since wavelength and frequency are inversely proportional, and since radio and light are both forms of electromagnetic radiation, the two terms are closely analogous.


    The Word DMA (WDMA) interface was the fastest method used to transfer data between the computer (through the ATA controller) and an ATA device until UDMA. Single/Multiword DMA took over from PIO as the choice of interface between ATA devices and the computer. The WDMA interface is grouped into different modes.

    The explanation for the difference between single and multiword DMA can be found in how the Intel DMA chip 8237 works. In single transfer mode only one word (16-bit) will be transferred between the device and the computer before returning control to the CPU and later it will repeat this cycle, allowing the CPU to process data while data is transferred.

    In multiword transfer mode (Block mode) once transfer is begun it will continue until all words are transferred..........

    mark me as an answer if i helped u.......

    Saturday, February 24, 2007 2:14 AM
  • No scope of development in India, at least for next 3 yrs.
    Saturday, February 24, 2007 6:37 PM
  • why so?
    Sunday, February 25, 2007 4:59 AM