1 / 13

Digital Switching Principles

Digital Switching Principles. Digital Switching. The digital signals of several speech / datasamples are time multiplexed on a common media before being switched through the system.

zachary-calhoun
Download Presentation

Digital Switching Principles

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Digital Switching Principles

  2. Digital Switching • The digital signals of several speech / datasamples are time multiplexed on a common media before being switched through the system. • To connect any two subscribers, it is necessary to interconnect the time-slots of the two speech samples which may be on same or different PCM highways.

  3. The digitalised speech samples are switched in two modes, viz., • Time Switching and • Space Switching.

  4. Space Switching • In the space-switching mode, corresponding time-slots of I/C and O/G PCM highways are interconnected. • A sample, in a given time-slot, TSi of an I/C HWY, say HWY1, is switched to same time-slot, TSi of an O/G HWY, SAY HWY2. • Obviously there is no delay in switching of the sample from one highway to another highway since the sample transfer takes place in the same time-slot of the PCM frame.

  5. Digital Time Switch • A Digital Time Switch consists of two memories, viz., a speech or buffer memory to store the samples till destination time-slots arrive, and • a control or connection or address memory to control the writing and reading of the samples in the buffer memory and directing them on to the appropriate time-slots.

  6. Time switch can operate in two modes, viz., • I. Output associated control • ii. Input associated control

  7. OUTPUT ASSOCIATED CONTROL SWITCH

  8. INPUT ASSOCIATED CONTROL SWITCH

  9. T S T SWITCH

  10. T S T SWITCH STRUCTURE

  11. Thank you

More Related