The HS-D

The HS-D is based on G.SHDSL technology. It not only provides long distance communication and wide transmission bandwidth, but also allows adjustment of the transmission bandwidth to suit customer requirements. It converts analog signals from customers circuits simultaneously to digital，then transmits the broad band digital signal composed by 64K digital signal on a twisted pair. When 10 EU's are fitted in a Subrack, the system can offer up to 160 customers access.

The HS-D EU is designed to be set into the Subrack and it communicates with the OMI through the Backplane，achieving performance monitoring, alarm management and system configuration；One connector of the EU is connected with the Exchange terminals, while the other connects with the LINK/PF of system via the backplane. When consumers are communicating, it achieves the function of A/D converter, code/decode, and muldex/concentrator, and feeds power to RU by a single DSL Link .
The RU is fixed and sealed in a plastic housing, which can be conveniently located, such as: hanging on a pole or the wall, or fixed below the ground. It joints to the customer terminals. The RU cooperates with EU to achieves function of A/D converter, code/decode, and muldex /concentrator, and feeds power to terminal equipment.