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Computer Networking: Difference between revisions
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====BGP==== | ====BGP==== | ||
==Physical Layer== | |||
There are several protocols at the physical layer such as ethernet, LTE, and DOCSIS. | |||
===Multiplexing=== | |||
Multiplexing is used to send or receive multiple signals along the same wire. Note that, sending and receiving count as two separate signals. | |||
Duplex means that the upstream and downstream are the the same speed. Full duplex (FDX) means the up and down can operate at the same time. | |||
* Time-division Multiplexing/Duplex (TDD) - if you don't have enough frequencies, you spend some time sending and some time receiving the signal. This is inherently not full duplex. | |||
* Frequency-division Multiplexing/Duplex (FDD) - with multiple frequencies, you can send and receive at the same time on separate frequencies. If the frequencies are evenly divided, you will have full duplex. | |||
* Echo Cancellation - by sending and receiving on the same frequencies at the same time, you can get full duplex. This is more complicated than the other options. | |||