SDH network architecture in general is as shown in Figure 5. The highest level, SDH transport network is nx STM-1 (nx 155 Mbps), which is crossed by the equipment connected DXC 4 / 4 (Digital Cross Connect). Brief description of the DXC is as follows: in digital telecommunications, digital signals are directed or routed to a central location-the telephone exchange called this DXC. DXC this serves to provide a place for interconnection relations wire line (hardwire) as well as routine maintenance and troubleshooting it. Each type of digital signal has its own digital penyakelar, for example at the DS-1 digital signal at 1.544 Mbps are called DXC-1, DS-4 at 274.176 Mbps called DXC-4. DXC 4 / 4 means a liaison between
The main task of the network is to provide a large trunk capacity between the central telephone exchange with the DXC-4 / 4 to allow for rapid restoration of connections if a node crashed or failed to function (impaired).
By using DXC 4 / 4 and the line terminal equipment to nx STM-1 (nx 155 Mbps), the smallest lebarpita handled by the transport network, granularitasnya (one of the canals before pemultiplekan) is an STM-1 (equivalent to 63 channels x 2 Mbps, or 1890 x 64 kbps). Fell further down the network hierarchy, DXC 4 / 1 (liaison with the hierarchy of the hierarchy to 4 to 1) break lebarpita STM-1 to the level of VC-12 (carrying E1). Each VC-12 can be individually routed to the node DXC 4 / 1 other or into the access network.
Through a combination of DXC 4 / 4 and 4 / 1, the granularity of the transport network to be E1 or 2 Mbps (for American T1 = 1.544 Mbps). A DXC 4 / 1 is used to provide granularity of VC-12 (E1) between layers of transport and access layers.
SDH access network are generally arranged in a ring-ring (ring forms) STM-1. ADM 4 / 1 (Add and Drop Multiplexer) for STM-1 mendemultiplek flow into streams E1, or E1 memultiplek flow into the stream STM-1 (hierarchy into the hierarchy to 4 with 1). E1 streams are being provided to end users through a standard interface G.703.
Referring to Figure 5, as mentioned above, the SDH network is divided into two layers (layer); transport layer and access layer. Transport layer consists of equipment located in the central DXC-telephone and high-capacity connections between the central-telephone exchange. Medium access layer consists of ADM equipment located in the central telephone exchange, or cabinets in the street, which is a provider of channel lebarpita for end users.
Source: http://elektroindonesia.com/elektro/telkom11a.html
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