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Optical Private Branch Exchange

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I am a student of Optical Engineering at the GIKI (GHULAM ISHAQ KHAN INSTITUTE OF ENGINEERING SCIENCES AND TECHNOLOGY). My final year project is based on the Optical Private Branch Exchange. Now the most important thing for me on the first stage is to get hold of the Pulse code Modulation as this will be used for the modulation of the signal.

If any body can help me on this topic or else on the whole of mine project it will be very help ful for me..

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