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arihant current affairs magazine The transfer of callrelated data doesnt happen in real time. A slow 64 kbps speed results in a time lag of two to three minutes. The callrelated data is not only transmitted in real time, at the speed of 2 mbps, the chances of missing any call are minimal.arihant current affairs magazine monthly Advantage Cheaper Costly, as cost of laying a fastspeed fibre optic cable connection is higher. Utility State agencies are more dependent on ISDN as it is cheaper Constitutional provisions on phone tapping arihant monthly current affairs magazine subscription

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