The PDH hierarchy
The PDH hierarchy
The PDH hierarchy
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© ICT electronics<br />
<strong>The</strong> arrival of digital technology<br />
digital<br />
analog<br />
Modem<br />
digital<br />
analog<br />
LE LE<br />
digital<br />
Modem<br />
analog digital analog<br />
LE LE<br />
LE LE<br />
analog<br />
digital<br />
digital<br />
: 1900<br />
: 1960<br />
: 1990<br />
Plesiochronous Digital Hierarchy<br />
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