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The routing decisions are made by the route processor and the switching fabric takes care of the routing based on the Route processor input. The CRS runs IOS XR which is said to be designed for high-end carrier grade routers and was launched with CRS-1. In a multi-chassis deployment, the Line card chassis is used along with another variety of ...
In voice telecommunications, least-cost routing (LCR) is the process of selecting the path of outbound communications traffic based on cost.Within a telecoms carrier, an LCR team might periodically (monthly, weekly or even daily) choose between routes from several or even hundreds of carriers.
The first production installation of the L-1 carrier system went into service between Stevens Point, Wisconsin and Minneapolis, Minnesota in 1941 over a distance of almost 200 miles (320 km). [ 3 ] with a capacity of 480 channels, far more than could be carried by balanced pair carrier systems , and cheaper per channel for high-usage routes.
Prices in the wholesale market are far lower than consumer prices but can and do change on a daily or weekly basis. A carrier will have a least cost routing function to manage its trading on the wholesale market. The quality of routes in the wholesale market can also vary, as the traffic may be going on a grey route.
Distance is a measure of the cost to reach a certain node. The least cost route between any two nodes is the route with minimum distance. Updates are performed periodically in a distance-vector protocol where all or part of a router's routing table is sent to all its neighbours that are configured to use the same distance-vector routing protocol.
Equal-cost multi-path routing (ECMP) is a routing strategy where packet forwarding to a single destination can occur over multiple best paths with equal routing priority. Multi-path routing can be used in conjunction with most routing protocols because it is a per-hop local decision made independently at each router.
Carrier preselect is a term relating to the telecommunications industry. It is a method of routing calls for least-cost routing (LCR) without the need for programming of PBX telephone system.
19th century telephone systems, operating at baseband, could only carry one telephone call on each wire, hence routes with heavy traffic needed many wires. In the 1920s, frequency-division multiplexing could carry several circuits on the same balanced wires , and by the 1930s L-carrier and similar systems carried hundreds of calls at a time on ...