What is SDH technology?

The

Synchronous Digital Hierarchy (SDH) technology is widely used for data communication. He is responsible for the exact timed transmission and data reception at very fast speeds. SDH usually uses cable or wireless media, such as digital microwave, and optical media such as optical fibers.

Using data transmission, SDH technology allows you to transmit and receive a huge amount of bits, as bit speeds are very high and bits are exactly timed or synchronous. The wide networks of the global mobile communication system (GSM) have a very good performance due to the synchronous nature of SDH technology. If synchronous transmissions were not used, GSM calls would fall out too often. This allows you to promote the timing link to the network. At the SDH website cluster, the main clock will have a very migration of TE timing. One of the good sources of global bits timing is the satellites of the Global Positioning System (GPS) that are able to provide an accurate reference to nand timing for data bits. A typical digital microwave device can carry four or eight E1 links, a European standard 32-channel carrier. One, E1 carries 2,048 kilobites per second (kbps), so the link E1 carries 32 x 64.

In GSM networks, each cell can need up to eight channels on the E1 carrier. There are 32 channels, so about four channels will be assigned to each cell space. In order to share one E1, there is a need to add/drop (ADM) multiplexer. ADM provides channels or time plans while adding channels from the sound derived from subscribers from the web.

For the above GSM Network, four cellular areas will be supported by one E1 carrier. The first site will manage four channels and leave the rest of the channels for other sites to add a signal and eliminate the signal. Meanwhile, all cellular areas in the hierarchical structure will have to be synchronized until the mobile switching boarLára (MSO). The term "backhaul" refers to a whole set of digital signals that need to be pulled back to "Switch" or MSO, where these signals are returned to the local cell network or passed to another network using the switched MSO gate.