# BER calculation formula

45BER calculation formula:

B1 BER = Number of B1 errored blocks/(N x 270 columns x 9 rows x 8 bits x 1s x 8000 frame/second).

Note: N in the preceding formula is the number in STM-N.

B2 BER = Number of B2 errored blocks/{[(261columns x 9 rows) + (9 columns x 5 rows)] x 8 bits x 1s x 8000 frame/second}.

B3 BER = Number of B3 errored blocks/(261 columns x 9 rows x 8 bits x 1s x 8000 frame/second).

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