a) How many seconds does it take to dial 02123835700 as DTMF and PULSE? (Take the protection period as 300 ms) b) Why is

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answerhappygod
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a) How many seconds does it take to dial 02123835700 as DTMF and PULSE? (Take the protection period as 300 ms) b) Why is

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a) How many seconds does it take to dial 02123835700 as DTMF and PULSE? (Take the protection period as 300 ms)b) Why is a protection period needed?
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