155 Mb/s ATM Bit Error Rate Test
This test demonstrates how the characteristics of an ATM channel above 100 MHz affect the robustness of 155 Mb/s ATM network. A series of Bit Error Rate (BER) measurements were performed on two category 5 channels that have similar properties up to 100 MHz but differ above 100 MHz in that one of the channels has a defect at 124 MHz. The channel with the defect above 100 MHz but that nevertheless passed the category 5 certification, exhibited BER of 9.6 x 10
-8, which
significantly violates the maximum BER of 10
-10 specified by the AF-PHY-0015.000 ATM Forum standard. By contrast, the
channel with consistent behavior up to 155 MHz exhibited BER of 1.1 x 10
-11.
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