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Version 1.0, 4/10/02
Page 5 of 17
The result is that ATM is significantly more efficient that Ethernet in terms of Mbps for carrying
very small PDUs. Every Mbps of single-cell-PDUs on the ATM link requires (84/55) Mbps on
the matching Ethernet link(s).
0
16
32
48
64
80
96
112
128
144
160
176
020406080100120140
IP Packet Length [Bytes]
Ethernet Frame Bytes AAL5 PDU Length
Figure 2 – Frame and PDU Length versus IP Packet Length
0
100
200
300
400
500
600
700
800
900
1000
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
IP Packet Length [Bytes]
OC-12 Input
OC-3 Input
Figure 3 – Expected Ethernet Transmit Bandwidth