Figure 101. 140Mbit/S Signal Management Block Diagram - Alcatel 1660SM Technical Handbook

140 Mbit/s port management
( See Figure 101. on page 205 )
Side B to Side A description:
•
PPI This block provides the interface between the physical transmission medium and the
internal unit format. The received line signal is CMI coded. A decoder on the physical interface
decodes the signal to NRZ (no return–to–zero) format.
•
LPA The 140 Mbit/s plesiochronous stream is inserted in a C4 container to be adapted so as
to be transported into the synchronous network.
•
HPT The Virtual Container (VC–4) is formatted. The VC–4 is structured so that its octets are
distributed within a 125 µs. interval and consist of the C4 container and POH.
Side A to Side B description:
•
HPT The HPT extract and processes the POH to determine the status of the defined path
attributes.
•
LPA It extracts the 140 Mbit/s signal from the container C4 .
•
PPI This block provides the interface between the internal unit format and the physical
transmission medium. It encodes CMI the signal to be sent on line.

Figure 101. 140Mbit/s signal management block diagram

ED
02
Side B
PPI
LPA
HPT
w1
From point Z1
Figure 99.
Side A
PPI
LPA
HPT
w2
To point Z2
Figure 99.
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