The PDH hierarchy
The PDH hierarchy
The PDH hierarchy
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© ICT electronics<br />
Multiframe Alignment Signal (MFAS)<br />
b 1<br />
a 1<br />
b 2<br />
a 2<br />
b 3<br />
a 3<br />
TS16<br />
0MFAS 0 0 0 SA<br />
S<br />
c1 d1 a16 b16 c16 d16 c2 d2 a17 b17 c17 d17 c3 d3 a18 b18 c18 d18 Used to synchronize the CAS<br />
No MFAS<br />
(NMFAS)<br />
Plesiochronous Digital Hierarchy<br />
28 /32
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