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Advertisement WiFi connections are running at half-duplex while the wired part of the LAN are on full-duplex. So it seems that by connecting through WiFi, something had to give. Were we shortchanged? Do you like losing half of anything? Worse, will we not be able to perform certain stuff with our computers and peripheral devices if they were connected through WiFi? Duplex versus Simplex In networking, the term ‘duplex’ signifies the ability for two points or devices to communicate with each other, as opposed to ‘simplex’ which refers to unidirectional communication. In a duplex communication system, both points (devices) can transmit and receive information.

Examples of duplex systems include telephones and walkie-talkies. On the other hand, simplex systems only permit one device to transmit information, while other receives. The common infrared remote control a prime example of a simplex system, where the IR remote controller transmits signals but never receives any in return. Full and Half-Duplex Full-duplex communication between two components means that both can transmit and receive information between each other simultaneously. Telephones are full-duplex systems so both parties on the phone can talk and listen at the same time. In half-duplex systems, the transmission and reception of information must happen alternately. While one point is transmitting, the other must only receive.

Walkie-talkie radio communication is a half-duplex system, this is characterised by saying “over” at the end of a transmission to signify that the party is ready to receive information. A simple illustration of a half-duplex communication system. Image credit. How Duplexing Affects WiFi Routers WiFi routers are devices that modulate and schedule the flow of information to and from any WiFi-capable electronic device (like a laptop or smartphone) to the Internet, using a specific standard or protocol called IEEE 802.11 which works at half-duplex. WiFi is just the trademark brand for this specific standard ( Wi-Fi can be a bit confusing because there are a handful of different standards being used.

Network File System (NFS), a distributed file system protocol developed by Sun Microsystems. NFS is the common for file sharing on NAS server Mac OS X can be setup as an NFS client to access shared files on the network. Mounting NFS volumes in OS X can be done using following methods. Connect to nfs share.

Here's what you need to know.). WiFi devices wirelessly connect to the router using radio waves at 2.4GHz or at 5GHz. The router schedules and makes sure the correct information flows between each connected device and the Internet; without collision and loss; by a process call Time Division Duplexing (TDD) to behave like full-duplexing. TDD emulates full-duplexing by setting up or dividing time periods that alternate between transmission and reception. Data packets flow both ways as dictated by the time divisions.

By chopping these time periods finely, devices connected this way seem to be transmitting and receiving simultaneously. Why Can’t Current Routers Run At Full-Duplex? The biggest problem to achieving full-duplex capability over radio is self-interference.

This interference or noise is more intense than the actual signal itself. Simply put, interference in a full-duplex system occurs when a single point is transmitting and receiving simultaneously, and it will receive its own transmission too, hence self-interference is produced. Diagram illustrating self-intereference.

Credit: Practical full-duplex wireless is possible in the realms of research and academia. This is largely achieved by cancelling the self-interference on two levels. The first is by signal inversion of the noise signal itself and then the process of noise-cancellation is further enhanced digitally. A few Stanford University students have in 2010 and 2011 ().