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"Token Ring is an example of a ring topology." 802.5 (Token Ring) networks do not use a ring topology at layer 1. Token Ring networks are technologies developed by IBM typically used in local area networks. Token Ring (802.5) networks imitate a ring at layer 2 but use a physical star at layer 1. "Rings prevent collisions." The term "ring" only ...
Date/Time Thumbnail Dimensions User Comment; current: 18:46, 23 July 2009: 900 × 420 (91 KB): SCH56 == Summary == {{Information |Description={{en|1=Diagram illustrating the interconnection and data flow in a SERCOS III industrial control interface network in ring configuration.}} |Source=Own work by uploader |Author=SCH56 |Date=2009-07-23
Token Ring is a physical and data link layer computer networking technology used to build local area networks. It was introduced by IBM in 1984, and standardized in 1989 as IEEE 802.5. It uses a special three-byte frame called a token that is passed around a logical ring of workstations or servers.
A network's logical topology is not necessarily the same as its physical topology. For example, the original twisted pair Ethernet using repeater hubs was a logical bus topology carried on a physical star topology. Token Ring is a logical ring topology, but is wired as a physical star from the media access unit.
Ethernet Ring Protection Switching (ERPS) is an effort at ITU-T under G.8032 Recommendation to provide sub-50ms protection and recovery switching for Ethernet traffic in a ring topology and at the same time ensuring that there are no loops formed at the Ethernet layer.
Metro Ethernet uses a fibre optic ring as a Gigabit Ethernet MAN backbone within a larger city. The ring topology is implemented using Internet Protocol (IP) so that data can be rerouted if a link is congested or fails. [6] In the US the Sprint was an early adopter of fibre optic rings that routed IP packets on the MAN backbone.
For ring topology with n nodes two links should be broken to bisect the network, so bisection bandwidth becomes bandwidth of two links. Bisection of a ring network. For tree topology with n nodes can be bisected at the root by breaking one link, so bisection bandwidth is one link bandwidth. Bisection of a tree network
In this status, one of the MRM ring ports is blocked, while the other is forwarding. Conversely, both ring ports of all MRCs are forwarding. Loops are avoided because the physical ring topology is reduced to a logical line topology. In case of failure, the network works in the Ring-Open status (Figure 2).