Question

How can an ADSL modem use the same portion of frequency for upstream and downstream transmission? 

   How can an ADSL modem use the same portion of frequency for upstream and downstream transmission?
Understanding Data Communications: From Fundamentals to Networking
Understanding Data Communications: From Fundamentals to Networking
Gilbert Held 3rd Edition
Chapter 8, Problem 38 ↓

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ADSL typically uses Frequency Division Multiplexing (FDM) where different frequency bands are allocated for: - Voice: 0-4 kHz - Upstream data: 25-138 kHz - Downstream data: 138 kHz-1.1 MHz Step 2: However, there is a variation called "overlapped spectrum ADSL" or  Show more…

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How can an ADSL modem use the same portion of frequency for upstream and downstream transmission?
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