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ADSL is an asymmetric communication technology designed for residential users; it is not suitable for businesses.

The existing local loops can handle bandwidths up to 1.1 MHz.

ADSL is an adaptive technology. The system uses a data rate based on the condition of the local loop line.

Communication in the traditional cable TV network is unidirectional.

Communication in an HFC cable TV network can be bidirectional.

Downstream data are modulated using the 64-QAM modulation technique.

The theoretical downstream data rate is 30 Mbps.

Upstream data are modulated using the QPSK modulation technique.

The theoretical upstream data rate is 12 Mbps.

SONET Devices

SONET Frame

Frame Transmission

Synchronous Transport Signals

STS-1

Virtual Tributaries

Higher-Rate Service

SONET is a synchronous TDM system controlled by a master clock.

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