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System Architecture

ADSL System reference model, which is shown in figure gif, describes the basic blocks of an ADSL-system.

The decomposed and routed data from the access module, see figure gif, is connected to an ATU-C (ADSL Transceiver Unit - Central Office) in which the data will be converted into analog signals. The analog signals are then carried with POTS signals to remote end. ATU-C also receives and decodes data coming from customers premises send by ATU-R (remote).

Both ATU-C and ATU-R (ADSL Transceiver Unit) are described in more detail in figures gif and gif.

The splitter either combines or separates the signals depending on the direction of the transmission. It protects MTS from voice-band interference generated by both ATU's and on the other hand it protects ATU's from MTS-related signals.

Figure: ADSL System Reference Model

Figure: ATU-C Transmitter reference model

Figure: ATU-R Transmitter reference model

Kimmo K. Saarela
Mon Mar 6 12:47:27 EET 1995