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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.
Ethernet Configuration Testing Protocol is a diagnostic protocol included in the Xerox Ethernet II specification. [1] Functionality of the protocol is similar to that offered by ping but it operates at the data link layer as opposed to the network layer. Ethernet Configuration Testing Protocol was implemented on DEC hosts and Cisco routers. [2]
CSUs can be categorized by the class of service they support (DS1, DS3, DDS, etc.) and by the capabilities within that class.For example, basic DS1 (T1) CSUs support loopback of each interface and will produce alarm indication signal to the provider's network interface device (NID) in the event of loss of signal from the customer-premises equipment (CPE).
This allows the company to test the line from the central telephone exchange, without the need to have test equipment at the customer site. The telephone company usually has the ability to remotely activate loopback, without even needing personnel at the customer site. When looped back, the customer equipment is disconnected from the line.
IEEE 802.1ag is an amendment to the IEEE 802.1Q networking standard which introduces Connectivity Fault Management (CFM).This defines protocols and practices for the operations, administration, and maintenance (OAM) of paths through 802.1 bridges and local area networks (LANs).
Examples of simple channel ... or singularly at one end with a loopback ... This pattern stresses the minimum ones density of 12.5% and should be used when testing ...
The primary purpose of a DS1 Network Interface Unit, T1-NIU (AKA Smartjack to many) is to provide a remote test point to the service provider to a DS1 (T1) circuit at the Network Interface (NI). In simple terms, a T1-NIU provides full DS1 loopback towards the network to permit a service provider to test to the NI from a central test center to ...
The Sniffer was the first product of Network General Corporation, founded on May 13, 1986 [8] [9] by Harry Saal and Len Shustek to develop and market network protocol analyzers. The inspiration was an internal test tool that had been developed within Nestar Systems , [ 10 ] a personal computer networking company founded in October 1978 by Saal ...