otdr। how to use otdr। fiber optic testing(trace)। फाइबर ऑप्टिक ट्रेस (otdr) कैसे करें।

otdr। how to use otdr। fiber optic testing(trace)। फाइबर ऑप्टिक ट्रेस (otdr) कैसे करें।
@Raj telecom communication
rai telecom communication
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