sonet 101
sonet 101
sonet 101
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What are the Benefits of SONET?<br />
DSX-3<br />
DSX-1<br />
DSX-3<br />
FOTS<br />
A<br />
M13<br />
Mux<br />
M13<br />
Mux<br />
FOTS<br />
C<br />
Some DS-1s<br />
Dropped / Inserted<br />
Existing Asynchronous Systems<br />
SONET<br />
Add / Drop<br />
32<br />
DSX-1<br />
Only DS-1s / DS-3s /<br />
STS-1s that are added /<br />
dropped need to be<br />
multiplexed /<br />
demultiplexed<br />
SONET System<br />
Figure 3-4 • Reduction of Back-to-Back Multiplexing<br />
REDUCED CABLING AND ELIMINATION OF DSX PANELS<br />
Asynchronous systems are dominated by back-to-back terminals because the<br />
asynchronous FOTS architecture is inefficient for other than point-to-point<br />
networks. (See Figure 3-5.) Excessive multiplexing and demultiplexing are used<br />
to transport a signal from one end to another, and many bays of DSX-1 crossconnect<br />
and DSX-3 panels are required to interconnect the systems. Associated<br />
expenses are the panel, bays, cabling, the labor installation, and the inconveniences<br />
of increased floor space and congested cable racks.<br />
The corresponding SONET system allows a hub configuration, reducing the<br />
need for back-to-back terminals. Grooming is performed electronically so DSX<br />
panels are not used except when required to interface with existing asynchronous<br />
equipment.
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