Why half duplex

I can however understand FDD, well, its basics. Simply put full duplex is the networking term for describing the communication between two locations or devices in both directions simultaneously. In wireless bridging this give numerous benefits and complexities while also adding a few pounds to the overall price tag. It's worth bearing in mind that in the wireless bridging world these abilities are only found in Millimetre technologies and frequencies. These solutions are typically enterprise or carrier class solutions specifically designed for commercial use.

Therefore, only a single spare is required to serve both ends of a link. It may be as simple as re-terminating or cutting some off the end of one of your service loops. You need to know if it is the outside-plant cable, or if it is in the connection to the inside plant cable, or the inside-plant cable on either end easy fix. It would be a shame if this problem is only 5 feet into your 10 meter service loop on one end, and you just put up with the problem.

Show 1 more comment. Pieter Pieter 1, 9 9 silver badges 14 14 bronze badges. Rich Seifert gives the answer for Gigabit Ethernet in his book "Gigabit Ethernet" and in an usenet post : Quote: The answer is more political than technical.

Random 2 2 bronze badges. Am I correct that half-duplex mode support in Ethernet chipsets was crucial in case either a network hub Yes hub is internally a single wire It would be more accurate to say a hub simulates a single wire, it's actually a bit more complex than that. Yes Are there any reasons for half-duplex connections in Ethernet environments where twisted-pair cabling is used and hubs are not used?

The other big one is old end devices. Peter Green Peter Green Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Explaining the semiconductor shortage, and how it might end. Does ES6 make JavaScript frameworks obsolete? Upcoming Events. Featured on Meta. With half-duplex mode, data can move in two directions, but not at the same time. The term duplex, on its own, refers to the capability to send and receive data.

Duplex is often used when talking about conversations over a telephone or computer. A full-duplex Ethernet environment can use a pair of twisted cable for packet receiving and a pair of twisted cable for transmission. Until the Device replies or is timed out , the Controller can't interrogate another device.

With these protocols there is little advantage to having a different reply path. For any data channel you have limited bandwidth, declaring something "full duplex" doesn't change that. Your DSL line has to allocate different parts of its bandwidth to uploading vs downloading. Wifi signals can only transmit so much before they start interfering.

Generally if you allocate more bandwidth to upload, you have less for download and vice versa. This is true of pretty much every media. You can route two wires to get full duplex to somewhere, but then only half your full bandwidth is used for each direction because you could have had both wires transmitting the same direction if one side was more chatty. Unless you are expecting exactly the same constant amount of data in both directions always, full duplex doesn't make much sense.

It makes much more sense to utilize your full bandwidth for whomever needs to talk at a given time so they can finish what they have to say quickly and let someone else talk. If you remember modems and the speed jump that happend with the V.

Half duplex made things significantly faster. Additionally it is a whole lot harder to do multi-drop protocols full duplex.

There are some times where full duplex does make sense in a limited situation, sometimes you actually have the extra bandwidth so are okay wasting some on the unused channel because the improvement in throughput is worth it or the characteristics of what it is used for makes full duplex more natural.

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Why use half duplex at all? Ask Question. Asked 6 months ago. Active 6 months ago.