Optical Transport Network

The optical transport network ( OTN, English:. Optical transport network) is a standardized by the ITU G.709 standard technology for a telecommunications network transmit user data with the network operator by means of a transport service.

Architecture

The architecture of optical transport network consists of three layers:

• The lowest layer, the Optical Transmission Section ( OTS), describes the optical fiber link between two optical system components. Which may optical amplifier ( OA ), optical add-drop multiplexer (OADM ) or optical cross connect ( OXC ) can be.
• The overlying layer Optical Multiplex Section (OMS ), includes the multiplexing functions of a DWDM connection between two network nodes.
• The top layer, the Optical Channel Layer ( OCh ), describes the optical channel between two parties. In such a channel, any user data can be transmitted. Standardized adaptation functions make it possible to transmit Ethernet and IP frames without PDH or SDH framing.

Analogous to the names PDH and SDH was for the optical transport hierarchy stands OTH (English: optical transport hierarchy ) selected. The bit that is transmitted from optical transport network start, where the SDH technology to stop. Standardized bit rates of optical transport hierarchy are:

In addition, OTU -2, as described in the ITU document G.Sup43 be overclocked ( OTU -2e ) to 10 Gigabit Ethernet LAN PHY to enable.

Devices that conform to the standardized architecture of the OTN, have now been presented by all the major manufacturers of telecommunications equipment, and are now also used in the technical infrastructure of the Internet. Devices from different manufacturers is to interconnect so far but only to a limited extent, since the standardization so far describes only optical multiplexing principles without specifying the physical implementation up in all the details.