CIT 307 Online Data Communications High Speed Digital Access Module 10 Kevin Siminski, Instructor.

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Presentation transcript:

CIT 307 Online Data Communications High Speed Digital Access Module 10 Kevin Siminski, Instructor

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

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

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

DMT

Subdividing Bandwidth

ADSL Modem

DSLAM

Cable Modems – Traditional system

Traditional Cable Communication in the traditional cable TV network is unidirectional.

HFC Network

HFC Cable Communication in an HFC cable TV network can be bidirectional.

Coaxial Cable bands

Bandwidth on Coaxial. The theoretical downstream data rate is 30 Mbps. The theoretical upstream data rate is 12 Mbps.

Cable Modem

CMTS

SONET Synchronous Optical NETworking This technology is the backbone of the telephone network!

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

A SONET network

SONET rates STSOCRate (Mbps)SPE (Mbps)User (Mbps) STS-1OC STS-3OC STS-9OC STS-12OC STS-18OC STS-24OC STS-36OC STS-48OC STS-192OC

STS Multiplexing