20.12
TRANSPORTING ATM CELLS
533
Figure 20.15
Reference configuration for traffic control and congestion control. [From Figure 1/I.371,
page 3, ITU-T Rec. I.371 (Ref. 13).]
20.12
TRANSPORTING ATM CELLS
20.12.1
In the DS3 Frame
One of the most popular high-speed digital transmission systems in North America is DS3
operating at a nominal transmission rate of 45 Mbps. It is also being widely implemented
for transport of SMDS. The system used to map ATM cells into the DS3 format is the
same that is used for SMDS.
To map ATM cells into a DS3 bit stream, the physical layer convergence protocol
(PLCP) is employed. A DS3 PLCP frame is shown in Figure 20.16.
Figure 20.16
Format of DS3 PLCP frame. (From Ref 1, courtesy of Hewlett-Packard.)
Summary :
20.12 TRANSPORTING ATM CELLS 533 Figure 20.15 Reference configuration for traffic control and congestion control. 13).] 20.12 TRANSPORTING ATM CELLS 20.12.1 In the DS3 Frame One of the most popular high-speed digital transmission systems in North America is DS3 operating at a nominal transmission rate of 45 Mbps.
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