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PCM 2009 C - ISIS NEWTON VARESE

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8000 ⋅ Frame<br />

sec<br />

<strong>PCM</strong>:il multiplo primario<br />

La velocità del flusso di bit (bit-rate) nel sistema <strong>PCM</strong><br />

europeo si può valutare come segue:<br />

⋅<br />

32 ⋅ canali<br />

Frame<br />

8 ⋅ bit<br />

⋅ 2.048Mbps<br />

canale<br />

I segnali Multiplex <strong>PCM</strong> Primari sono alla base<br />

delle gerarchie PDH :<br />

standard europeo: 2.048 Mb/s, 30 canali telefonici<br />

( legge A )<br />

standard americano: 1.544 Mb/s, 24 canali<br />

telefonici (legge µµµµ)‏ ‏‏ ‏<br />

56

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