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LAST MINUTE REVISION

  IB Section -  There are three Push buttons in IB panel. PB 1- To reset Axle counter when IB Home passed at ON PB 2- To reset Axle counter due to failure or improper counting. PB 3 - To give co operation to the station at rear. PB 1 and PB 2 can be used only with co operation of station ahead. This co operation is given by pressing PB 3 and indicated by white line near PB1 or PB 2. There are four Indicators at IB panel. K1 Indicator- When a train passes IB at ON,K1 indicator appears and alarm sounds. This indication dissapears after normal restoration of circuits by using PB1 and Co operation from Station master . K2 Indicator- When train passes LSS and enters Axle counter section, K2 Indicator appears and alarm sounds.This indication disappear when as LSS knob is put back to Normal. K3 Indicator-  When a train passes IB at OFF,K3 indicator appears and alarm sounds. This indication dissapears IBS knob is normalized . K4 Indicator-  Appears when power supply of IB si...
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TELECOM COMBINED FOR EXAM

  All about OFC SM fibre ( Single mode fibre)- It is a type of fibre optics cable that has smaller core diameter compared to multimode fibre. This means only a single mode of light can travel through it,resulting less signal loss and higher bandwidth. It transmits a single ray of light,which has higher bandwidth capabilities and preferred in longer distance applications. Impurities and irregulations in physical construction of optical fibre causes Scattering. Optical fibres accept only unipolar signals only. Isopropyl alcohol is used to clean after removing primary coating of OFC. Multi mode Fibre Optic Cable- Large diameter core that allows multiple modes of light to propogate. As the core increases,more data passes through a given time. Quality of signal reduced over long distances. Typically used for short distances, data and audio/video applications in LANs. Windows of OFC - 1 st window - 850 nm - Short wavelength region 2 nd window - 1310 nm - Medium wavelength (O band) 3 rd w...
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