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Loopback (also written loop-back) is the routing of electronic signals or digital data streams back to their source without intentional processing or modification. It is primarily a means of testing the communications infrastructure.
Loopback can take the form of communication channels with only one communication endpoint. Any message transmitted by such a channel is immediately and only received by that same channel. In telecommunications, loopback devices perform transmission tests of access lines from the serving switching center, which usually does not require the assistance of personnel at the served terminal. Loop around is a method of testing between stations that are not necessarily adjacent, wherein two lines are used, with the test being done at one station and the two lines are interconnected at the distant station. A patch cable may also function as loopback, when applied manually or automatically, remotely or locally, facilitating a loop-back test.
Where a system (such as a modem) involves round-trip analog-to-digital processing, a distinction is made between analog loopback, where the analog signal is looped back directly, and digital loopback, where the signal is processed in the digital domain before being re-converted to an analog signal and returned to the source.
Loopback (also written loop-back) is the routing of electronic signals or digital data streams back to their source without intentional processing or modification...
for loopback purposes. It is used to access the network services that are running on the host via the loopback network interface. Using the loopback interface...
Loopback device may refer to: Loopback, related to electronic communication interfaces Loop device, a pseudo-device in Unix-like operating systems This...
depend on them. A special case of private link-local addresses is the loopback interface. These addresses are private and link-local by definition, since...
in common use when classful networking was practiced. For example, the loopback address 127.0.0.1 was commonly written as 127.1, given that it belongs...
After omitting consecutive sections of zeros: 2001:db8::ff00:42:8329. The loopback address 0000:0000:0000:0000:0000:0000:0000:0001 is defined in RFC 5156...
package util-linux. Sometimes, the loop device is erroneously referred to as loopback device, but this term is reserved for a networking device in operating...
ability to access Android's internally implemented Toybox, via device loopback support. Some VM/emulator apps have a fixed set of OS's or applications...
short representations for IPv6 addresses. For example, the localhost (loopback) address, 0:0:0:0:0:0:0:1, and the IPv6 unspecified address, 0:0:0:0:0:0:0:0...
Null modem is a communication method to directly connect two DTEs (computer, terminal, printer, etc.) using an RS-232 serial cable. The name stems from...
such as those in 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16 and fc00::/7, loopback interfaces like 127.0.0.0/8 and ::1, and link-local addresses like 169...
attacks: DNS servers in the chain can filter out private IP addresses and loopback IP addresses: External public DNS servers (e.g. OpenDNS) can implement...
While the 127.0.0.0/8 network is a Class A network, it is designated for loopback and cannot be assigned to a network. Class D is reserved for multicast...
there is no loss in sound quality. VAC is the audio equivalent of a MIDI loopback device such as MultiMid or Hubi, and can be used instead of "Stereo Mix"...
protection. Asus released a soundcard which features a function called "Analog Loopback Transformation" to bypass the restrictions of DRM. This feature allows...
only Administrators can sniff packets. Npcap is able to sniff and inject loopback packets (transmissions between services on the same machine) by using the...
Loop line could refer to: Loop around, telephone company test circuit Loopback, electrical or datacomm loop Loop line (railway) Loop Line, Chongqing Rail...
Considerations RFC 7706, Decreasing Access Time to Root Servers by Running One on Loopback RFC 7816, DNS Query Name Minimisation to Improve Privacy RFC 8499, DNS...
power bursts, may cause back reflections, may cause signal dispersion etc. Loopback fiber optic attenuator is designed for testing, engineering and the burn-in...
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