Trunking

Bundling (English Trunking) referred to in the telecommunications and computer science bringing together several transmission channels (physical lines, bands, etc.) into a single logical, so visible for the user connection.

In computer science, trunking usually referred to the amalgamation of several physically separate Ethernet or telecommunications connections to a single logical. The data are transmitted with synchronous or asynchronous process of the resulting logical connection. At the physical layer comes to either a single channel or ( for load distribution and increase in throughput ) multiple parallel channels are used. The Link Aggregation Control Protocol ( LACP) is used for bandwidth scaling is normalized by the IEEE under " Aggregation of Multiple Link Segments"; see the term Spanning Tree Protocol.

Trunking is also used as a term for trunked radio networks.

Trunking is a term used by Sun Microsystems, which is also used across manufacturers. At Cisco, the term Etherchannel, used on Linux systems, the term bonding, in fact it is at all three to the same function.

The term "Trunk " is used in VLANs in a slightly altered meaning. Here are several different VLANs are performed via a physical connection, so there is no increase in throughput.

Trunk in the network wiring

In the structured cabling, here considered within a data center, is meant by Trunks the combining of multiple cables in a single. This combination offers the simplicity of a physical installation other benefits. Thus, the handling is easier with changes, cable lines in the data center be better used and last but not least reduce the fire load.

A distinction is made between copper and fiber optic trunks trunks. Copper Trunks individual cables are typically formed from six to eight, which are factory- cut to length and are terminated at both ends with RJ45 modular connector units. Fiber optic trunks can be designed as a single fiber trunks, for example, factory terminated on both ends with LC connectors, or as a multi- fiber trunk. The latter has at its ends with a multi- fiber connector such as the MPO connector and can typically be used by design and for parallel optical systems such as Infiniband or 40/100 Gigabit Ethernet.

To migrate from single-fiber technique (based on eg LC or SC connectors ), to parallel optical transmission is used for the MPO Trunks additional module technology. This includes the back one with MPO eg twelve fibers and the front six LC duplex adapters or splitters ( Harnesses ) with, eg, one-sided twelve MPO fibers. On the other hand six LC duplex connectors are used.

Bundling in telecommunications

As a bundle is called in communication engineering is a logical group of channels (or lines ) that are used from the user perspective equivalent. News Equipment distinguish between feeder, Customers and Inter bundles. The distribution of traffic on the various channels of a bundle customer does not take place transparently to the user. Since bundle for economic reasons can not be aligned to any conceivable offer a suitable transport model in conjunction with a particular service must ensure that blockages do not exceed acceptable levels in a bundle. The design of bundles is done with methods of transport theory.