R-STM-1E is a multiplexer based on Synchronous Digital Hierarchy (SDH) transmission cores for the Local Loop, supporting up to 63 E1s or a mix of E1/E3 or E1/T3 tributary interfaces. The unit can be deployed in access nodes as a terminal multiplexer (TM) or add-drop multiplexer (ADM). It enables expansion of the Local Loop to 60 km (37 miles), creating a transmission layer fully compatible with regional and national SDH networks. From this transmission layer, the full range of multiservice access solutions can be deployed to provide cost-effective and quick service deployment. SDH transmission supports a full range of access systems, including remote subscriber units (RSUs), digital line carriers (DLCs), digital cross connect (DXC 1/0) and service multiplexers. The device is fully compatible with 34/45 Mbps PDH signals, SDH microwave radio relays and existing SDH infrastructure. It supports the following range of SDH network topologies:- point-to-point - chain - STM-1 ring/folded ring R-STM-1 base unit is available with standard G.703 or optical short or long haul aggregate modules for network connectivity and 21 x 2 Mbps tributary interfaces. The R-STM-1E extended modules enable tributary expansion up to:- 63 x 2 Mbps - 3 x 34 Mbps - 3 x 45 Mbps The compact size and low power consumption of the R-STM-1E allow easy rack or wall installation at the customer premises, in telecommunications buildings or in outdoor cabinets. R-STM-1E is also available with an integrated 1/0 cross connect in the DXC-STM-1, which features both DXC 1/0 cross connect and SDH ADM capabilities. The R-STM-1E facilitates centralized management of the access network, combining RADview and the SDH transmission layer network management applications. The centralized network management application uses embedded management channels for communication with remote access equipment. They enable the building of flexible, responsive and optimized SDH access networks to fit any customer's needs. Network management must be used in order to configure the R-STM-1E. The 2 Mbps output signals can be resynchronized by the multiplexer clock and pointer justification events can be filtered out, eliminating phase hits. This creates an accurate signal, clear of phase hits and suitable for synchronization of access equipment. Since the SDH network is usually synchronized by the national synchronization network, this accurate timing is transferred to the access equipment. 
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