
ATM Features and Implementation Notes
5-13
Converting Mb/s to Cells/s
Several ATM traffic parameters require you to enter values in cells/second
(cells/s). To convert to cells/s, divide the number of bits/s by 424 (the number of
bits per ATM cell).
Although we use raw bandwidth to describe line rates, inherent overhead within
the media limits maximum bandwidth for the line. Use Table 5-1 to determine the
maximum bandwidth for the media you are using.
Table 5-1. Maximum Bandwidth
Media
Raw
Bandwidth (Mb/s)
Maximum
Bandwidth (Mb/s)
Maximum
Cells/s
OC-3 SONET/SDH 155 149.76 353207
DS-3 44.736 40.704 96000
E-3 (G.832 Framing) 34.368 33.920 80000
E-3 (G.751 Framing) 34.368 30.528 72000
Number of bits/second
Number of bits/ATM cell
= Number of cells/second
For example:
100,000,000 bits/s
424 bits/cell
= 235,849 cells/s
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